A Coriolis mass flow sensor includes a flow tube, a light source, and a
light pipe having a light inlet situated to receive light from the light
source and a light outlet for emitting light received from the light
source. A light detector receives light from the light pipe light
outlet, and a drive device vibrates the flow tube such that the flow
tube moves through a light path between the light outlet of the light
pipe and the light detector. In certain embodiments, the light pipe
defines a generally square cross section. A sensing aperture having a
predetermined shape is situated between the light outlet of the light
pipe and the light detector. The sensing aperture passes a portion of
the light emitted from the light outlet of the light to the light
detector, such that the light entering the light detector has the
predetermined shape.
CROSS-REFERENCE TO RELATED APPLICATIONS
This application is a non-provisional of U.S. Provisional Patent
Application Ser. Nos. 60/481,852 and 60/521,223, filed on Jan. 2, 2004
and Mar. 15, 2004, respectively, which are incorporated by reference
herein.
BACKGROUND
The invention relates generally to a mass flow measurement and control,
and more particularly, to a mass flow measurement and control device
based on the Coriolis force effect.
Mass flow measurement based on the Coriolis force effect is achieved in
the following manner. The Coriolis force results in the effect of a mass
moving in an established direction and then being forced to change
direction with a vector component normal to the established direction of
flow. This can be expressed by the following equation:
F ⇀ C = 2 M ⇀ × ω ⇀
Where
F ⇀ C
• (the Coriolis force vector) is the result of the cross product of
M ⇀
• (the momentum vector of the flowing mass) and
ω ⇀
• (the angular velocity vector of the rotating coordinate system).
In a rotating system, the angular velocity vector is aligned along the
axis of rotation. Using the “Right Hand Rule”, the fingers define the
direction of rotation and the thumb, extended, defines the angular
velocity vector direction. In the case of the typical Coriolis force
flow sensor, a tube, through which fluid flow is to be established, is
vibrated. Often the tube is in the shape of one or more loops. The loop
shape is such that the mass flow vector is directed in opposite
directions at different parts of the loop. The tube loops may, for
example, be “U” shaped, rectangular, triangular or “delta” shaped or
coiled. In the special case of a straight tube, there are two
simultaneous angular velocity vectors that are coincident to the anchor
points of the tube while the mass flow vector is in a single direction.
The angular velocity vector changes directions since, in a vibrating
system, the direction of rotation changes. The result is that, at any
given time, the Coriolis force is acting in opposite directions where
the mass flow vectors or the angular velocity vectors are directed in
opposite directions. Since the angular velocity vector is constantly
changing due to the vibrating system, the Coriolis force is also
constantly changing. The result is a dynamic twisting motion being
imposed on top of the oscillating motion of the tube. The magnitude of
twist is proportional to the mass flow for a given angular velocity.
Mass flow measurement is achieved by measuring the twist in the sensor
tube due to the Coriolis force generated by a fluid moving through the
sensor tube. Typical known devices use pick off sensors comprising
magnet and coil pairs located on the flow tube where the Coriolis
force's induced displacement is expected to be greatest. The coil and
magnet are mounted on opposing structures, for example, the magnet is
mounted on the tube and the coil is mounted on the stationary package
wall. The coil will move through the magnet's field, inducing a current
in the coil. This current is proportional to the velocity of the magnet
relative to the coil.
In low flow applications, however, the tube is relatively small. This
makes it difficult or impossible to mount sensing hardware on the tube
itself. Prior art solutions to sensing the tube vibrations have been
largely unsatisfactory. The present invention addresses shortcomings
associated with the prior art.
ISweek（http://www.isweek.com/）- Industry sourcing & Wholesale industrial products
2016年7月28日星期四
2016年7月20日星期三
Thermal mass flow controller having orthogonal thermal mass flow sensor
A thermal mass flow controller having a thermal mass flow
meter with an orthogonal thermal mass flow sensor includes a base defining a
primary fluid flow path therein for carrying a flow of fluid to be metered. A
pressure dropping bypass is positioned in the primary fluid flow path. A flow
measuring portion of a thermal mass flow sensor is oriented substantially
transversely or orthogonally with respect to and is in communication with the
primary fluid flow path. The flow measuring portion includes a portion of an
electrical bridge for determining a temperature of the sensor and produces a
mass flow rate signal in response thereto. A valve is connected to an outlet of
the primary flow path to control the flow of fluid in response to the mass flow
rate signal.
Descrizione
CROSS REFERENCE TO RELATED APPLICATION
This application is a continuation of application Ser.
No. 08/608,218 filed Feb. 28, 1996 now abandoned, which is a continuation of
application Ser. No. 08/461,398 filed Jun. 5, 1995 now abandoned, which is a
continuation of 08/361,855 filed Dec. 22, 1994 now abandoned, which is a
continuation of application Ser. No. 08/137,879 filed Oct. 15, 1993 now
abandoned, which is a continuation-in-part of U.S. application Ser. No.
07/962,290, filed Oct. 16, 1992 for Thermal Mass Flow Controller Having
Orthogonal Thermal Mass Flow Sensor now abandoned.
BACKGROUND OF THE INVENTION
The invention relates generally to a thermal mass flow
controller and in particular relates to a thermal mass flow controller having a
portion of a sensing element oriented transversely with respect to a bypass
flow path extending through the thermal mass flow controller.
Thermal mass flow controllers and thermal mass flow
meters are employed in the semiconductor industry and in other industries for
measuring the rate of flow of a quantity of gas employed in a piece of
equipment for the manufacture of a semiconductor wafer and the like. Such
thermal mass flow controllers often are used in gas shelves of diffusion
furnaces, chemical vapor deposition systems, plasma etching systems, sputtering
systems and the like to meter precisely amounts of reactant and carrier gases
to a working chamber of the equipment. The thermal mass flow controllers are
used to meter precisely the amounts of reactant and carrier gases to be
delivered to a treatment chamber of the equipment. Such treatment chambers may
comprise process tubes or process chambers. Such gases may include hydrogen, oxygen,
nitrogen, argon, silane, dichlorosilane, ammonia, phosphorus oxychloride,
diborane, boron tribromide, arsine, phosphine, sulfur hexafluoride and the
like. Oftentimes, multiple gas sources are employed in conjunction with a
particular treatment chamber. For instance, silane may be used in the treatment
chamber for chemical vapor deposition of polycrystalline silicon, also known as
polysilicon, in combination with one or more doping agents. As a result, each
of the process tubes or process chambers in a particular piece of equipment may
have multiple reactant gas delivery lines connected and must, of necessity,
have multiple mass flow controllers connected in the gas lines to meter
appropriate amounts of the reactant and carrier gases process gases to the
treatment chamber. The use of such multiple mass flow controllers, of course,
expands the size of the gas shelves used for these types of equipment.
The manufacture of modern semiconductors having finer and
finer microelectronic features has necessitated that the acceptable
contamination levels within clean rooms in which such manufacturing takes place
have continuously been reduced in order to provide adequate wafer yields. As a
result, the expense involved in the construction of such clean rooms has steadily
increased and is anticipated to continue increasing. As such clean rooms are
expanded in size due to the relative amount of floor space or foot-prints
occupied by equipment, their corresponding cost of course also increases. Thus,
the equipment size for a given throughput through a particular clean room is an
economic consideration which is always of importance to a wafer fabricator.
Concomitant with the space requirements for clean rooms
is a requirement that footprint considerations often require that mass flow
controllers be capable of use in a variety of orientations. Unfortunately, in
most cases, conventional thermal mass flow controllers may only be used with
their bypass and sensors both positioned substantially horizontally to avoid
introducing unwanted convective effects into the sensor which would result in
perturbation of the mass flow controller readings.
One approach to solving the convection problem is to
allow a flow controller for instance to be oriented vertically, as set forth in
PCT application PCT/US91/04208, published Dec. 26, 1991, corresponding to U.S.
application Ser. No. 07/537,571, filed Jun. 14, 1990 now abandoned and
corresponding U.S. application Ser. No. 07/614,093, filed Nov. 14, 1990 now
abandoned all for Thermal Mass Flow Meter, assigned to the instant assignee.
Those applications disclose a thermal mass flow meter having a sensor which
allows the bypass flow path to be oriented in a substantially vertical
direction without the necessity of the sensor being oriented in a substantially
horizontal direction. The mass flow controller, however, like other prior art
mass flow controllers may only be used in a vertically oriented direction. That
is, it has a single preferred direction in which it may be oriented. It may not
be used in a variety of attitudes other than with the bypass position
substantially vertically.
What is needed then is a thermal mass flow controller
which is compact and may be positioned in a variety of orientations with
introducing convective perturbations in the flow controller reading.
2016年7月12日星期二
Mass Flow Sensors: Mass Flow versus Volumetric Flow and Flow Rate Unit Conversions
This technical note explains the following:
How mass flow is measured with volumetric units at standard conditions.
How to convert between volumetric units at standard conditions of 0ºC, 1
atm, and nonstandard temperature and pressure conditions.
How to convert between volumetric units at standard conditions of 0ºC, 1
atm, and an alternative standard temperature and pressure conditions.
How to convert from volumetric units to mass units.Honeywell mass flowsensors use a silicon sense die construction known as a microbridge to measure
the rate of mass transfer in a fluid.
Mass flow is a dynamic mass/time unit measured in grams per minute. It is
common in the industry to specify mass flow in terms of volumetric flow units
at standard (reference)
conditions. By referencing a volumetric flow to a standard temperature and
pressure, an exact mass flow (g/min) can be calculated from volumetric flow.
The temperature and pressure reference conditions of the volumetric unit
do not imply nor do
they require the pressure and temperature conditions of the measured fluid
to be the same; they are simply part of the volumetric unit that is required to
specify mass from a measured volume.
Honeywell mass flow sensors are generally specified as having volumetric
flow units at standard reference conditions of 0°C and 1 atm. This is indicated
on volumetric units with the "
S" prefix. For example: SCCM "Standard Cubic Centimeters (per)
Minute"
Reference Conditions: 0°C, 1 atm SLPM "Standard Liters (per)
Minute" Reference Conditions: 0°C, 1 atm If a certain application requires
nonstandard reference conditions, the units will be specified in the device
datasheet without the “S” prefix and the reference conditions will be
called out. The “@” symbol will be used to indicate the volumetric unit
reference conditions for temperature and flow.
For example:
CCM@ 21°C, 101.325 kPa
LPM @ 20°C, 1013.25 mbar
When designing an application around a mass flow sensor, it is critical to
use consistent refere
nce conditions for volumetric units throughout the system. There is no
industry standard for
the reference conditions indicated by “SCCM” or “SLPM”, they must be
explicitly determined.
Consider a Honeywell mass low sensor which has output calibrated for a
full scale of 1000
SCCM. If this sensor is used in a system with a mass flow controller that
has a Full Scale of
1000 SCCM(defined by the manufacturer as using a reference condition of
25°C, 1 atm), then without converting units, the system error will be more than
9% of reading.
2016年7月7日星期四
Monolithic MEMS Mass Flow Sensor for Liquids and Gases
The mass flow sensor is suitable both for gases and for liquids and can be used for the
direct measurement in the flow range of 0 to 2 slpm (standard liters per
minute).
The
solution uses a thermal process as a measuring principle: it consists of a
heating element and two differentially arranged thermocouples. The
temperature gradient is a measure of the flow rate. In contrast to the
conventional technology come directly from the heating element and sensing
resistors with the medium to be measured in contact, it is characterised in
that the sensor element is completely inside a monolithic
semiconductor. Hence the media touches only the durable protective layer
of the sensor, and so is protected from contamination, condensation and
abrasion.
The
SiF2011 consists of a compatible to standard medical flow housing and a PCB
with the complete signal conditioning. The sensor provides both an analog
output (0 to 5V) and a digital I2C interface, is characterised by a short
response time (<8 ms) and is in the extended temperature range of -25 ° C to
+ 85 ° C. For convenient evaluation of the demonstration kit SiF3011 is
available.
2016年6月29日星期三
Miniature Mass Flow Sensor
Market demand for a miniature mass flow sensor for tight packaging
applications such as pick & place equipment with multiple heads
drove Omron to take its proven MEMS sensor technology and successfully
repackage it into a smaller envelope. The resulting product, the
D6F-03A3 is a unidirectional MEMS mass flow sensor in the desired
compact, streamlined body.
The D6F-03 series operates on a supply voltage of 10.8 to 26.4VDC while consuming just 15mA maximum. Their output signal is analog, 1 to 5VDC with load resistance of 10k Ohms minimum. The case is composed of molded thermoplastic and aluminum alloy with a three-pin industry standard electrical connector.
There are many applications utilizing these devices including pick & place systems, leak detection, spectroscopy, mass flow controllers, test equipment, and fuel cells.
Engineering samples and a complete set of technical data are available by contacting Omron Electronic Components.
ISweek（http://www.isweek.com/）- Industry sourcing & Wholesale industrial products
The D6F-03 series operates on a supply voltage of 10.8 to 26.4VDC while consuming just 15mA maximum. Their output signal is analog, 1 to 5VDC with load resistance of 10k Ohms minimum. The case is composed of molded thermoplastic and aluminum alloy with a three-pin industry standard electrical connector.
There are many applications utilizing these devices including pick & place systems, leak detection, spectroscopy, mass flow controllers, test equipment, and fuel cells.
Engineering samples and a complete set of technical data are available by contacting Omron Electronic Components.
ISweek（http://www.isweek.com/）- Industry sourcing & Wholesale industrial products
2016年6月22日星期三
Modeling, design, fabrication and characterization of a micro Coriolis mass flow sensor
This paper discusses the modeling, design and realization of
micromachined Coriolis mass flow sensors. A lumped element model is used
to analyze and predict the sensor performance. The model is used to
design a sensor for a flow range of 0–1.2 g h−1 with a maximum pressure
drop of 1 bar.
The sensor was realized using semi-circular channels just beneath the surface of a silicon wafer. The channels have thin silicon nitride walls to minimize the channel mass with respect to the mass of the moving fluid. Special comb-shaped electrodes are integrated on the channels for capacitive readout of the extremely small Coriolis displacements.
The comb-shaped electrode design eliminates the need for multiple metal layers and sacrificial layer etching methods. Furthermore, it prevents squeezed film damping due to a thin layer of air between the capacitor electrodes.
As a result, the sensor operates at atmospheric pressure with a quality factor in the order of 40 and does not require vacuum packaging like other micro Coriolis flow sensors. Measurement results using water, ethanol, white gas and argon are presented, showing that the sensor measures true mass flow. The measurement error is currently in the order of 1% of the full scale of 1.2 g h−1.
ISweek（http://www.isweek.com/）- Industry sourcing & Wholesale industrial products
The sensor was realized using semi-circular channels just beneath the surface of a silicon wafer. The channels have thin silicon nitride walls to minimize the channel mass with respect to the mass of the moving fluid. Special comb-shaped electrodes are integrated on the channels for capacitive readout of the extremely small Coriolis displacements.
The comb-shaped electrode design eliminates the need for multiple metal layers and sacrificial layer etching methods. Furthermore, it prevents squeezed film damping due to a thin layer of air between the capacitor electrodes.
As a result, the sensor operates at atmospheric pressure with a quality factor in the order of 40 and does not require vacuum packaging like other micro Coriolis flow sensors. Measurement results using water, ethanol, white gas and argon are presented, showing that the sensor measures true mass flow. The measurement error is currently in the order of 1% of the full scale of 1.2 g h−1.
ISweek（http://www.isweek.com/）- Industry sourcing & Wholesale industrial products
2016年6月15日星期三
A MEMS-based Coriolis Mass Flow Sensor for Industrial Applications
A microfluidic Coriolis mass flow sensor is discussed. The micromachined
flow sensors are made using silicon tubes bonded onto a metalized glass
substrate. True mass flow rates with better than +/- 0.5% accuracy were
measured between 1 g/hr to 500 g/hr. The sensor also provides a
temperature and density output. The sensor output was resistant to
pressure, temperature, vibration fluid density and viscosity. Unlike
conventional steel Coriolis mass flow meters, MEMS-based sensors are immune to external vibration.
Applications for these low flow rate devices includes, chemical mixing, additives, biotechnology, chromatography, pharmaceutical development and other areas where extremely small volumes of liquids are mixed, studied or metered and where shock and vibration are encountered.
The majority of MEMS-based flow sensors employ volumetric flow measurement methods such as thermal hot wire sensors [1,2]. The advantages of a Coriolis mass flow sensor [3-9] over other methods include the ability to measure true mass flow regardless of the fluid going through the resonating tube. Coriolis mass flow technology also provides a fluid density output which can be used for fluid identification, concentration measurement and quality monitoring. Conventional Coriolis mass flow sensors [8,9] have been commercially available for over 30 years.
These flow meters generally employ large diameter stainless steel tubes. Unlike steel
tube meters which are fabricated one at a time, MEMS-based sensors [3-7] employ wafer fabrication enables hundreds of micromachined silicon Coriolis mass flow tubes and even assembled subsystems to be produced with one wafer stack. This batch fabrication method reduces the manufacturing costs enabling a wider use of Coriolis mass flow technology.
The basic function of an ideal resonating Coriolis mass flow sensor can be expressed by the following equations. The mass flow rate q is given by: q = Ksθ/(4ωLr) (1) Where, Ks angular spring constant of the flow tube, θ is the twisting angle of the tube, ω is the resonance frequency, L is the length of the tube and r is the radius of the U-bend of the tube. Therefore, the mass flow rate is directly proportional to the twisting angle and inversely proportional to the resonance frequency. The density of a liquid ρ is given by the expression:
ρ = 1/V [(Ks/4π2f2) –mt](2)
where V is the internal volume of the resonant tube, mt is tube mass, Ks is the spring constant of the tube and f is the resonance frequency of the tube. As can be seen by the expression above, the density is inversely proportional to the square of the resonance frequency.
Any process requiring the metering or mixing of small amounts of liquids or gases such as semiconductor doping, leak detection, cleaning chemicals, additives, pharmaceutical formulation, fragrance and flavor additions can benefit from this technology. Precise
mixing requires the measurement of true mass flow, not an estimate based on a volumetric measurement. The performance of a MEMS-based Coriolis mass flow
sensor, designed for industrial applications will be covered in this paper.
ISweek（http://www.isweek.com/）- Industry sourcing & Wholesale industrial products
Applications for these low flow rate devices includes, chemical mixing, additives, biotechnology, chromatography, pharmaceutical development and other areas where extremely small volumes of liquids are mixed, studied or metered and where shock and vibration are encountered.
The majority of MEMS-based flow sensors employ volumetric flow measurement methods such as thermal hot wire sensors [1,2]. The advantages of a Coriolis mass flow sensor [3-9] over other methods include the ability to measure true mass flow regardless of the fluid going through the resonating tube. Coriolis mass flow technology also provides a fluid density output which can be used for fluid identification, concentration measurement and quality monitoring. Conventional Coriolis mass flow sensors [8,9] have been commercially available for over 30 years.
These flow meters generally employ large diameter stainless steel tubes. Unlike steel
tube meters which are fabricated one at a time, MEMS-based sensors [3-7] employ wafer fabrication enables hundreds of micromachined silicon Coriolis mass flow tubes and even assembled subsystems to be produced with one wafer stack. This batch fabrication method reduces the manufacturing costs enabling a wider use of Coriolis mass flow technology.
The basic function of an ideal resonating Coriolis mass flow sensor can be expressed by the following equations. The mass flow rate q is given by: q = Ksθ/(4ωLr) (1) Where, Ks angular spring constant of the flow tube, θ is the twisting angle of the tube, ω is the resonance frequency, L is the length of the tube and r is the radius of the U-bend of the tube. Therefore, the mass flow rate is directly proportional to the twisting angle and inversely proportional to the resonance frequency. The density of a liquid ρ is given by the expression:
ρ = 1/V [(Ks/4π2f2) –mt](2)
where V is the internal volume of the resonant tube, mt is tube mass, Ks is the spring constant of the tube and f is the resonance frequency of the tube. As can be seen by the expression above, the density is inversely proportional to the square of the resonance frequency.
Any process requiring the metering or mixing of small amounts of liquids or gases such as semiconductor doping, leak detection, cleaning chemicals, additives, pharmaceutical formulation, fragrance and flavor additions can benefit from this technology. Precise
mixing requires the measurement of true mass flow, not an estimate based on a volumetric measurement. The performance of a MEMS-based Coriolis mass flow
sensor, designed for industrial applications will be covered in this paper.
ISweek（http://www.isweek.com/）- Industry sourcing & Wholesale industrial products
2016年6月1日星期三
A Virtual EXV Mass Flow Sensor for Applications With Two-Phase Flow Inlet Conditions
In conventional vapor compression systems,
electronic expansion valves (EXVs) are used for refrigerant flow control.
Subcooled refrigerant enters the expansion device and is expanded to the
evaporation pressure while the valve opening is modified to achieve the desired
mass flowrate.
The relationship between the inlet and outlet
conditions, the opening, and the mass flowrate has been extensively studied,
e.g. by Park et al. (2007) and appropriate empirical correlations have been
developed. However, for certain operating conditions (e.g. low refrigerant
charge) or applications that generally have two-phase inlet conditions (e.g.
balancing valves used in a hybrid control scheme as proposed by Kim et al.
(2008)), these correlations are not applicable, since even low inlet vapor
fractions lead to a significant reduction of the valve mass flowrate at a given
opening.
This paper proposes a continuous correlation
that can be used for both two-phase and subcooled valve inlet conditions. The
benefit of the continuity is that there is a smooth transition between
subcooled and two-phase inlet conditions, which is essential for control and
simulation purposes. The new correlation employs the Buckingham-Pi theorem as
proposed by Buckingham (1914). The selected dimensionless Pi-groups describe
opening of the valve, subcooling, inlet and outlet pressures, driving pressure
difference across the valve, inlet density, surface tension, and viscosity.
The data that was used to determine the
coefficients of the correlation was taken on a dedicated valve test stand,
which was sized for the per-circuit capacity of a typical 5-ton R410A heat pump
and a 3-ton R404A large room cooling system. The purpose of these tests was
mainly to map the valves for the low pressure drops, high inlet qualities and
large valve openings that occur when they are used as balancing valves in a
hybrid control approach. Two commercially available valves of different rated
capacity were tested.
Due to the much higher valve capacity for
subcooled inlet conditions, valve openings of less than 5% occurred in that
case. This led to an accuracy of the correlation for these points that is less
than what typically can be found for correlations with subcooled inlet
conditions in the open literature. However, for two-phase flow inlet
conditions, the resulting RMS of 1.0 g/s for the 8-PI correlation is
sufficiently small to use the approach for estimating the refrigerant mass flow
and using the EXV as a virtual mass flow sensor. The limitations of this approach in
practical applications, as well as possible applications in fault detection and
diagnostics are shown for application as balancing valves within a 5-ton R410A
heat pump and a 3-ton R404A large room cooling system.
2016年5月27日星期五
What are the symptons of a malfunctioning mass airflow sensor?
An engine with a bad Mass flow sensor may be hard to start or stall after starting. It may hesitate under
load, surge, idle rough or run excessively rich or lean. The engine may also
hiccup when the throttle suddenly changes position.
If you suspect a Mass flow sensor problem, scan for any fault codes. A Mass flow sensor problem should (but does not always) set a fault code. Codes that may indicate a problem with the sensor include: GM: Code 33 (too high frequency) and Code 34 (too low frequency) on engines with multiport fuel injection only, and Code 36 on 5.0L and 5.7L engines that use the Bosch hot-wire Mass flow sensor, if the burn-off cycle after shut-down fails to occur.
Of course, don’t overlook the basics, such as low engine compression, low vacuum, low fuel pressure, leaky or dirty injectors, ignition misfire, excessive backpressure (plugged converter), etc., since problems in any of these areas can produce similar driveability symptoms.
Mass flow sensors can be tested either on or off the vehicle in a variety of ways. You can use a Mass flow Sensor Tester and tachometer to check the sensor’s response. If testing on the vehicle, unplug the wiring harness connector from the sensor and connect the tester and tachometer. Start the engine and watch the readings. They should change as the throttle is opened and closed. No change would indicate a bad sensor. The same hookup can be used to test the Mass flow sensor off the vehicle. When you blow through the sensor, the readings should change if the sensor is detecting the change in air flow.Another check is to read the sensor’s voltage or frequency output on the vehicle. With Bosch hot-wire Mass flow sensors, the output voltage can be read directly with a digital voltmeter by backprobing the brown-andwhite output wire to terminal B6 on the PCM. The voltage reading should be around 2.5 volts. If out of range, or if the sensor’s voltage output fails to increase when the throttle is opened with the engine running, the sensor may be defective. Check the orange and black feed wire for 12 volts, and the black wire for a good ground. Power to the Mass flow sensor is provided through a pair of relays (one for power, one for the burn-off cleaning cycle), so check the relays too, if the Mass flow sensor appears to be dead or sluggish. If the sensor works but is slow to respond to changes in air flow, the problem may be a contaminated sensing element caused by a failure in the self-cleaning circuit or relay. With GM Delco MAF sensors, attach a digital voltmeter to the appropriate MAF sensor output terminal.
With the engine idling, the
sensor should output a steady 2.5 volts. Tap lightly on the sensor and note the
meter reading. A good sensor should show no change. If the meter reading jumps
and/or the engine momentarily misfires, the sensor is bad and needs to be
replaced. You can also check for heat-related problems by heating the sensor
with a hair dryer and repeating the test. This same test can also be done using
a meter that reads frequency. The older AC Delco MAF sensors (like a 2.8L V6)
should show a steady reading of 32 Hz at idle to about 75 Hz at 3,500 rpm. The
later model units (like those on a 3800 V6 with the Hitachi MAF sensor) should
read about 2.9 kHz at idle and 5.0 kHz at 3,500 rpm. If tapping on the MAF sensor
produces a sudden change in the frequency signal, it’s time for a new sensor.
On GM hot-film MAFs, you can also use a scan tool to read the sensor’s output in “grams per second” (gps), which corresponds to frequency. The reading should go from 4 to 8 gps at idle up to 100 to 240 gps at wide-open throttle. Like throttle position sensors, there should be smooth linear transition in sensor output as engine speed and load change. If the readings jump all over the place, the computer won’t be able to deliver the right air/fuel mixture and driveability and emissions will suffer. So you should also check the ensor’soutput at various speeds to see that its output hanges appropriately. Another way to observe the sensor’s output is to look at its waveform on an oscilloscope. The waveform should be square and show a gradual increase in frequency as engine speed and load increase. Any skips or sudden jumps or excessive noise in the pattern would tell you the sensor needs to be replaced. Yet another way to check the MAF sensor is to see what effect it has on injector timing. Using an oscilloscope or multimeter that reads milliseconds, connect the test probe to any injector ground terminal (one injector terminal is the supply voltage and the other is the ground circuit to the computer that controls injector timing). Then look at the duration of the injector pulses at idle (or while cranking the engine if the engine won’t
start). Injector timing varies depending on the application, but if the mass air flow sensor is not producing a signal, injector timing will be about four times longer than normal (possibly making the fuel mixture too rich to start). You can also use millisecond readings to confirm fuel enrichment when the throttle is opened during acceleration, fuel leaning during light load cruising and injector shut-down during deceleration. Under light load cruise, for example, you should see about 2.5 to 2.8 Ms duration.
On GM hot-film MAFs, you can also use a scan tool to read the sensor’s output in “grams per second” (gps), which corresponds to frequency. The reading should go from 4 to 8 gps at idle up to 100 to 240 gps at wide-open throttle. Like throttle position sensors, there should be smooth linear transition in sensor output as engine speed and load change. If the readings jump all over the place, the computer won’t be able to deliver the right air/fuel mixture and driveability and emissions will suffer. So you should also check the ensor’soutput at various speeds to see that its output hanges appropriately. Another way to observe the sensor’s output is to look at its waveform on an oscilloscope. The waveform should be square and show a gradual increase in frequency as engine speed and load increase. Any skips or sudden jumps or excessive noise in the pattern would tell you the sensor needs to be replaced. Yet another way to check the MAF sensor is to see what effect it has on injector timing. Using an oscilloscope or multimeter that reads milliseconds, connect the test probe to any injector ground terminal (one injector terminal is the supply voltage and the other is the ground circuit to the computer that controls injector timing). Then look at the duration of the injector pulses at idle (or while cranking the engine if the engine won’t
start). Injector timing varies depending on the application, but if the mass air flow sensor is not producing a signal, injector timing will be about four times longer than normal (possibly making the fuel mixture too rich to start). You can also use millisecond readings to confirm fuel enrichment when the throttle is opened during acceleration, fuel leaning during light load cruising and injector shut-down during deceleration. Under light load cruise, for example, you should see about 2.5 to 2.8 Ms duration.
2016年5月13日星期五
Mass flow sensor Introduction
A mass flow sensor (MAF) is used to find out the mass flowrate of air entering a fuel-injected internal combustion engine.
The air mass information is necessary for the engine control unit (ECU) to balance and deliver the correct fuel mass to the engine. Air changes its density as it expands and contracts with temperature and pressure. In automotive applications, air density varies with the ambient temperature, altitude and the use of forced induction, which means that mass flow sensors are more appropriate than volumetric flow sensors for determining the quantity of intake air in each cylinder. (See stoichiometry and ideal gas law.)
There are two common types of mass airflow sensors in use on automotive engines. These are the vane meter and the hot wire. Neither design employs technology that measures air mass directly. However, with additional sensors and inputs, an engine's ECU can determine the mass flowrate of intake air.
Both approaches are used almost exclusively on electronic fuel injection (EFI) engines. Both sensor designs output a 0.0–5.0 volt or a pulse-width modulation (PWM) signal that is proportional to the air mass flow rate, and both sensors have an intake air temperature (IAT) sensor incorporated into their housings for most post OBDII vehicles. Vehicles prior to 1996 could have MAF without an IAT. An example is 1994 Infiniti Q45.
When a MAF sensor is used in conjunction with an oxygen sensor, the engine's air/fuel ratio can be controlled very accurately. The MAF sensor provides the open-loop controller predicted air flow information (the measured air flow) to the ECU, and the oxygen sensor provides closed-loop feedback in order to make minor corrections to the predicted air mass. Also see MAP sensor.
ISweek（http://www.isweek.com/）- Industry sourcing & Wholesale industrial products
The air mass information is necessary for the engine control unit (ECU) to balance and deliver the correct fuel mass to the engine. Air changes its density as it expands and contracts with temperature and pressure. In automotive applications, air density varies with the ambient temperature, altitude and the use of forced induction, which means that mass flow sensors are more appropriate than volumetric flow sensors for determining the quantity of intake air in each cylinder. (See stoichiometry and ideal gas law.)
There are two common types of mass airflow sensors in use on automotive engines. These are the vane meter and the hot wire. Neither design employs technology that measures air mass directly. However, with additional sensors and inputs, an engine's ECU can determine the mass flowrate of intake air.
Both approaches are used almost exclusively on electronic fuel injection (EFI) engines. Both sensor designs output a 0.0–5.0 volt or a pulse-width modulation (PWM) signal that is proportional to the air mass flow rate, and both sensors have an intake air temperature (IAT) sensor incorporated into their housings for most post OBDII vehicles. Vehicles prior to 1996 could have MAF without an IAT. An example is 1994 Infiniti Q45.
When a MAF sensor is used in conjunction with an oxygen sensor, the engine's air/fuel ratio can be controlled very accurately. The MAF sensor provides the open-loop controller predicted air flow information (the measured air flow) to the ECU, and the oxygen sensor provides closed-loop feedback in order to make minor corrections to the predicted air mass. Also see MAP sensor.
ISweek（http://www.isweek.com/）- Industry sourcing & Wholesale industrial products
2016年5月1日星期日
Mass flow sensor
A mass flow sensor (MAF) is used to find out the mass flowrate
of air
entering a fuel-injected internal combustion engine.
The air mass information is necessary for the engine control unit (ECU) to balance and deliver the correct fuel mass to the engine. Air changes its density as it expands and contracts with temperature and pressure. In automotive applications, air density varies with the ambient temperature, altitude and the use of forced induction, which means that mass flow sensors are more appropriate than volumetric flow sensors for determining the quantity of intake air in each cylinder. (See stoichiometry and ideal gas law.)
There are two common types of mass airflow sensors in use on automotive engines. These are the vane meter and the hot wire. Neither design employs technology that measures air mass directly. However, with additional sensors and inputs, an engine's ECU can determine the mass flowrate of intake air.
Both approaches are used almost exclusively on electronic fuel injection (EFI) engines. Both sensor designs output a 0.0–5.0 volt or a pulse-width modulation (PWM) signal that is proportional to the air mass flow rate, and both sensors have an intake air temperature (IAT) sensor incorporated into their housings for most post OBDII vehicles. Vehicles prior to 1996 could have MAF without an IAT. An example is 1994 Infiniti Q45.
When a MAF sensor is used in conjunction with an oxygen sensor, the engine's air/fuel ratio can be controlled very accurately. The MAF sensor provides the open-loop controller predicted air flow information (the measured air flow) to the ECU, and the oxygen sensor provides closed-loop feedback in order to make minor corrections to the predicted air mass.
The air mass information is necessary for the engine control unit (ECU) to balance and deliver the correct fuel mass to the engine. Air changes its density as it expands and contracts with temperature and pressure. In automotive applications, air density varies with the ambient temperature, altitude and the use of forced induction, which means that mass flow sensors are more appropriate than volumetric flow sensors for determining the quantity of intake air in each cylinder. (See stoichiometry and ideal gas law.)
There are two common types of mass airflow sensors in use on automotive engines. These are the vane meter and the hot wire. Neither design employs technology that measures air mass directly. However, with additional sensors and inputs, an engine's ECU can determine the mass flowrate of intake air.
Both approaches are used almost exclusively on electronic fuel injection (EFI) engines. Both sensor designs output a 0.0–5.0 volt or a pulse-width modulation (PWM) signal that is proportional to the air mass flow rate, and both sensors have an intake air temperature (IAT) sensor incorporated into their housings for most post OBDII vehicles. Vehicles prior to 1996 could have MAF without an IAT. An example is 1994 Infiniti Q45.
When a MAF sensor is used in conjunction with an oxygen sensor, the engine's air/fuel ratio can be controlled very accurately. The MAF sensor provides the open-loop controller predicted air flow information (the measured air flow) to the ECU, and the oxygen sensor provides closed-loop feedback in order to make minor corrections to the predicted air mass.
2016年3月15日星期二
Evaluation of Virtual Refrigerant Mass Flow Sensors
Refrigerant mass flow rate is an important measurement for monitoring
equipment performance and enabling fault detection and diagnostics.
However, a traditional mass flow meter is expensive to purchase and
install.
A virtual refrigerant mass flow sensor (VRMF) uses a mathematical model to estimate flow rate using low-cost measurements and can potentially be implemented at low cost. This study evaluates three VRMFs for estimating refrigerant mass flow rate. The first model uses a compressor map that relates refrigerant flow rate to measurements of inlet and outlet pressure, and inlet temperature measurements.
The second model uses an energy-balance method on the compressor that uses a compressor map for power consumption, which is relatively independent of compressor faults that influence mass flow rate. The third model is developed using an empirical correlation for an electronic expansion valve (EEV) based on an orifice equation.
The three VRMFs are shown to work well in estimating refrigerant mass flow rate for various systems under fault-free conditions with less than 5% RMS error. Each of the three mass flow rate estimates can be utilized to diagnose and track the following faults:
1) loss of compressor performance,
2) fouled condenser or evaporator filter,
3) faulty expansion device, respectively. For example, a compressor refrigerant flow map model only provides an accurate estimation when the compressor operates normally. When a compressor suction or discharge valve is leaking and the compressor is not delivering the expected flow, the energy-balance or EEV model can provide accurate flow estimates.
In this case, the flow differences provide an indication of loss of compressor performance and can be used for fault detection and diagnostics, as will be demonstrated in this paper.
iSweek（http://www.isweek.com/）- Industry sourcing & Wholesale industrial products
A virtual refrigerant mass flow sensor (VRMF) uses a mathematical model to estimate flow rate using low-cost measurements and can potentially be implemented at low cost. This study evaluates three VRMFs for estimating refrigerant mass flow rate. The first model uses a compressor map that relates refrigerant flow rate to measurements of inlet and outlet pressure, and inlet temperature measurements.
The second model uses an energy-balance method on the compressor that uses a compressor map for power consumption, which is relatively independent of compressor faults that influence mass flow rate. The third model is developed using an empirical correlation for an electronic expansion valve (EEV) based on an orifice equation.
The three VRMFs are shown to work well in estimating refrigerant mass flow rate for various systems under fault-free conditions with less than 5% RMS error. Each of the three mass flow rate estimates can be utilized to diagnose and track the following faults:
1) loss of compressor performance,
2) fouled condenser or evaporator filter,
3) faulty expansion device, respectively. For example, a compressor refrigerant flow map model only provides an accurate estimation when the compressor operates normally. When a compressor suction or discharge valve is leaking and the compressor is not delivering the expected flow, the energy-balance or EEV model can provide accurate flow estimates.
In this case, the flow differences provide an indication of loss of compressor performance and can be used for fault detection and diagnostics, as will be demonstrated in this paper.
iSweek（http://www.isweek.com/）- Industry sourcing & Wholesale industrial products
2016年3月11日星期五
Delphi mass air flow sensors
Delphi Product & Service Solutions has seven new mass air flow sensors covering more than 1.1 million vehicles including Volkswagen,
Honda and Mercedes-Benz applications built from 1993 to 2011.
The part numbers are: AF10310, AF10316, AF10334, AF10338, AF10341 and AF10343.
Delphi says there are four reasons to choose the mass air flow sensor line:
1. OE engineered: Every sensor Delphi sells is calibrated to match the OE part and features resistors and circuit board technology unique to Delphi.
2. Over 30 years of expertise: Thanks to years of experience, Delphi can offer smart consolidations that cover 92% of vehicles in operation with only 100 SKUs.
3. Exact calibration: Delphi MAF sensors feature proprietary sensing elements that provide highly accurate readings and airflow output to the ECU over a wide range of ambient temperatures.
4. Innovative design: Delphi’s sensors are design to provide low restriction air measurement for increased horsepower and greater temperature compensation for outstanding performance over a wide range of conditions.
iSweek（http://www.isweek.com/）- Industry sourcing & Wholesale industrial products
The part numbers are: AF10310, AF10316, AF10334, AF10338, AF10341 and AF10343.
Delphi says there are four reasons to choose the mass air flow sensor line:
1. OE engineered: Every sensor Delphi sells is calibrated to match the OE part and features resistors and circuit board technology unique to Delphi.
2. Over 30 years of expertise: Thanks to years of experience, Delphi can offer smart consolidations that cover 92% of vehicles in operation with only 100 SKUs.
3. Exact calibration: Delphi MAF sensors feature proprietary sensing elements that provide highly accurate readings and airflow output to the ECU over a wide range of ambient temperatures.
4. Innovative design: Delphi’s sensors are design to provide low restriction air measurement for increased horsepower and greater temperature compensation for outstanding performance over a wide range of conditions.
iSweek（http://www.isweek.com/）- Industry sourcing & Wholesale industrial products
2016年3月9日星期三
Smallest detectable change in volume differs between mass flow sensor and pneumotachograph
To assess a pulmonary function change over time the mass flow sensor and
the pneumotachograph are widely used in commercially available
instruments. However, the smallest detectable change for both devices
has never been compared. Therefore, the aim of this study is to
determine the smallest detectable change in vital capacity (VC) and
single-breath diffusion parameters measured by mass flow sensor and or
pneumotachograph.
Method
In 28 healthy pulmonary function technicians VC, transfer factor for carbon monoxide (DLCO) and alveolar volume (VA) was repeatedly (10×) measured. The smallest detectable change was calculated by 1.96 x Standard Error of Measurement ×√2.
Findings
The mean (range) of the smallest detectable change measured by mass flow sensor and pneumotachograph respectively, were for VC (in Liter): 0.53 (0.46-0.65); 0.25 (0.17-0.36) (p = 0.04), DLCO (in mmol*kPa-1*min-1): 1.53 (1.26-1.7); 1.18 (0.84-1.39) (p = 0.07), VA (in Liter): 0.66. (0.53-0.82); 0.43 (0.34-0.53) (p = 0.04) and DLCO/VA (in mmol*kPa-1*min-1*L-1): 0.22 (0.19-0.28); 0.19 (0.14-0.22) (p = 0.79).
Conclusions
Smallest detectable significant change in VC and VA as measured by pneumotachograph are smaller than by mass flow sensor. Therefore, the pneumotachograph is the preferred instrument to estimate lung volume change over time in individual patients.
Background
To measure pulmonary function changes over time the mass flow sensor and the pneumotachograph are widely used instruments. Due to international equipment requirements, calibration, validation and measurement procedures both measurement devices are assumed to have identical reliability. However the smallest detectable change, which is the smallest significant change that can be detected between individual measurements, has in neither device, been determined. The smallest detectable change is a very useful parameter for clinical practice because it shows which changes in a single patient can be considered a 'real' change. Hence, pulmonary function instruments with the smallest detectable change are best suited for evaluating changes as a result of disease progress or applied therapy.
The aim of this study is to determine the smallest detectable change of vital capacity (VC) and single-breath diffusion parameters measured by mass flow sensor and pneumotachograph.
iSweek（http://www.isweek.com/）- Industry sourcing & Wholesale industrial products
Method
In 28 healthy pulmonary function technicians VC, transfer factor for carbon monoxide (DLCO) and alveolar volume (VA) was repeatedly (10×) measured. The smallest detectable change was calculated by 1.96 x Standard Error of Measurement ×√2.
Findings
The mean (range) of the smallest detectable change measured by mass flow sensor and pneumotachograph respectively, were for VC (in Liter): 0.53 (0.46-0.65); 0.25 (0.17-0.36) (p = 0.04), DLCO (in mmol*kPa-1*min-1): 1.53 (1.26-1.7); 1.18 (0.84-1.39) (p = 0.07), VA (in Liter): 0.66. (0.53-0.82); 0.43 (0.34-0.53) (p = 0.04) and DLCO/VA (in mmol*kPa-1*min-1*L-1): 0.22 (0.19-0.28); 0.19 (0.14-0.22) (p = 0.79).
Conclusions
Smallest detectable significant change in VC and VA as measured by pneumotachograph are smaller than by mass flow sensor. Therefore, the pneumotachograph is the preferred instrument to estimate lung volume change over time in individual patients.
Background
To measure pulmonary function changes over time the mass flow sensor and the pneumotachograph are widely used instruments. Due to international equipment requirements, calibration, validation and measurement procedures both measurement devices are assumed to have identical reliability. However the smallest detectable change, which is the smallest significant change that can be detected between individual measurements, has in neither device, been determined. The smallest detectable change is a very useful parameter for clinical practice because it shows which changes in a single patient can be considered a 'real' change. Hence, pulmonary function instruments with the smallest detectable change are best suited for evaluating changes as a result of disease progress or applied therapy.
The aim of this study is to determine the smallest detectable change of vital capacity (VC) and single-breath diffusion parameters measured by mass flow sensor and pneumotachograph.
iSweek（http://www.isweek.com/）- Industry sourcing & Wholesale industrial products
2016年3月1日星期二
High accuracy air flow sensor for industrial applications
The EE75 air velocity transmitters (air flow sensors) are optimized for
high accuracy up to 40 m/s (8000 ft/min) over the temperature range
-40...120 °C (-40...248 °F).
ISweek - Industry sourcinghe robust sensing probe and enclosure allow for EE75 use in harsh industrial environment as well as in applications with pressure rating up to 10 bar (145 psi).
Beside measuring air velocity and temperature, EE75 calculates the volumetric flow rate in m³/h or ft³/min based on the cross section of the duct, with an appropriate factory correction. The EE75 can be used to measure the velocity of various non-flammable and non-corrosive gases.
iSweek（http://www.isweek.com/）- Industry sourcing & Wholesale industrial products
ISweek - Industry sourcinghe robust sensing probe and enclosure allow for EE75 use in harsh industrial environment as well as in applications with pressure rating up to 10 bar (145 psi).
Beside measuring air velocity and temperature, EE75 calculates the volumetric flow rate in m³/h or ft³/min based on the cross section of the duct, with an appropriate factory correction. The EE75 can be used to measure the velocity of various non-flammable and non-corrosive gases.
iSweek（http://www.isweek.com/）- Industry sourcing & Wholesale industrial products
2016年2月24日星期三
Mass flow sensor
A mass flow sensor (MAF) is used to find out the mass flowrate
of air
entering a fuel-injected internal combustion engine.
The air mass information is necessary for the engine control unit (ECU) to balance and deliver the correct fuel mass to the engine. Air changes its density as it expands and contracts with temperature and pressure. In automotive applications, air density varies with the ambient temperature, altitude and the use of forced induction, which means that mass flow sensors are more appropriate than volumetric flow sensors for determining the quantity of intake air in each cylinder. (See stoichiometry and ideal gas law.)
There are two common types of mass airflow sensors in use on automotive engines. These are the vane meter and the hot wire. Neither design employs technology that measures air mass directly. However, with additional sensors and inputs, an engine's ECU can determine the mass flowrate of intake air.
Both approaches are used almost exclusively on electronic fuel injection (EFI) engines. Both sensor designs output a 0.0–5.0 volt or a pulse-width modulation (PWM) signal that is proportional to the air mass flow rate, and both sensors have an intake air temperature (IAT) sensor incorporated into their housings for most post OBDII vehicles. Vehicles prior to 1996 could have MAF without an IAT. An example is 1994 Infiniti Q45.
When a MAF sensor is used in conjunction with an oxygen sensor, the engine's air/fuel ratio can be controlled very accurately. The MAF sensor provides the open-loop controller predicted air flow information (the measured air flow) to the ECU, and the oxygen sensor provides closed-loop feedback in order to make minor corrections to the predicted air mass.
The air mass information is necessary for the engine control unit (ECU) to balance and deliver the correct fuel mass to the engine. Air changes its density as it expands and contracts with temperature and pressure. In automotive applications, air density varies with the ambient temperature, altitude and the use of forced induction, which means that mass flow sensors are more appropriate than volumetric flow sensors for determining the quantity of intake air in each cylinder. (See stoichiometry and ideal gas law.)
There are two common types of mass airflow sensors in use on automotive engines. These are the vane meter and the hot wire. Neither design employs technology that measures air mass directly. However, with additional sensors and inputs, an engine's ECU can determine the mass flowrate of intake air.
Both approaches are used almost exclusively on electronic fuel injection (EFI) engines. Both sensor designs output a 0.0–5.0 volt or a pulse-width modulation (PWM) signal that is proportional to the air mass flow rate, and both sensors have an intake air temperature (IAT) sensor incorporated into their housings for most post OBDII vehicles. Vehicles prior to 1996 could have MAF without an IAT. An example is 1994 Infiniti Q45.
When a MAF sensor is used in conjunction with an oxygen sensor, the engine's air/fuel ratio can be controlled very accurately. The MAF sensor provides the open-loop controller predicted air flow information (the measured air flow) to the ECU, and the oxygen sensor provides closed-loop feedback in order to make minor corrections to the predicted air mass.
2016年2月18日星期四
The Smallest Differential Pressure/Air Flow Sensor on the Market
Sensirion has launched the SDP3x, which is the world's smallest
differential pressure sensor. It offers superior precision and
repeatability, even below 1 Pa. It also provides long-term stability.
The SDP3x air flow sensor is reflow solderable, and provides prolonged functionality, such as smart averaging, interrupts and rapid sampling time of 2 kHz at 16 bit resolution. The novel sensor is an ideal choice for high volume and cost-sensitive applications where size is vital factor.
Key Features
The main features of the SDP3x sensor are listed below:
• Smallest size measuring just 5 x 5 x 8mm, which facilitates new dimension of applications
• Calibrated and temperature compensated
• Measurement range ±500 Pa (±2 in. H2O)
• Digital I2C and analog output versions
• There is no drift and no zero-offset
• Rapid sampling time of 2 kHz at 16 bit resolution
• Reflow solderable, shipped in "tape and reel" for "pick and place"
Applications
The SDP3x can be applied in the following areas:
• Heating, ventilation, air conditioning (HVAC)
• Medical home care applications
• Lifestyle and consumer products
• Portable medical devices
• Filter monitoring
• Appliances
iSweek（http://www.isweek.com/）- Industry sourcing & Wholesale industrial products
The SDP3x air flow sensor is reflow solderable, and provides prolonged functionality, such as smart averaging, interrupts and rapid sampling time of 2 kHz at 16 bit resolution. The novel sensor is an ideal choice for high volume and cost-sensitive applications where size is vital factor.
Key Features
The main features of the SDP3x sensor are listed below:
• Smallest size measuring just 5 x 5 x 8mm, which facilitates new dimension of applications
• Calibrated and temperature compensated
• Measurement range ±500 Pa (±2 in. H2O)
• Digital I2C and analog output versions
• There is no drift and no zero-offset
• Rapid sampling time of 2 kHz at 16 bit resolution
• Reflow solderable, shipped in "tape and reel" for "pick and place"
Applications
The SDP3x can be applied in the following areas:
• Heating, ventilation, air conditioning (HVAC)
• Medical home care applications
• Lifestyle and consumer products
• Portable medical devices
• Filter monitoring
• Appliances
iSweek（http://www.isweek.com/）- Industry sourcing & Wholesale industrial products
2016年2月11日星期四
Wright State Research Institute lands $14M Air Force sensors deal
The U.S. Air Force Sensor has tapped Wright State
Research Institute for as much as $14 million in aerospace sensor
work.
Late Friday, the Department of Defense announced WSRI won a
seven-year contract for the Sensor and Information Research
Center
Enlarge
Wright State Research Institute will perform as much as $14
million in aerospace sensor… more
Officials say the idea is to have researchers working on
innovative ground-breaking solutions for fundamental research projects that
address some of the most difficult sensor challenges and to find technology
breakthroughs.
The high-profile contract will help Wright State Research
Institute continue to build momentum in its quest to become a top-tier research
organization. It may also lead to lucrative commercialization opportunities for
the school.
Last year, the institute brought in some high-level talent,
including Michael Deis,
former leader of the sensors directorate at AFRL. That move certainly
positioned it well to win this latest contract.
In recent years, WSRI has nearly doubled in size, from 69
employees to 120. In fiscal year 2014, it grew its portfolio 17 percent to
$23.5 million, and officials say the institute is on track to grow 15 percent
to 17 percent this year.
2016年2月3日星期三
Standard Unveils NEW Mass Air Flow Sensor Program
Standard Motor Products (SMP®) announces its NEW Mass Air Flow Sensor
program. With over 140 SKUs for import and domestic, this line of 100%
NEW, not remanufactured MAF Sensors delivers industry-leading quality
with the broadest, most comprehensive coverage in the aftermarket.
Standard® NEW MAF sensors are tested and calibrated with sophisticated automated equipment so they match OE output precisely and perform flawlessly. And SMP-manufactured units feature many design improvements including thicker walls, upgraded componentry and custom-designed platinum sensors. Standard® is the only supplier to offer 'OE or Better' quality in a full line program.
"This launch establishes our commitment to providing the highest-quality replacement parts for air and fuel sensor categories," said Phil Hutchens, Vice President Engine Management Marketing, SMP. "Our new line offers technicians an all-new MAF Sensor rather than remanufactured, ensuring product quality and precise system operation."
All New Standard® Mass Air Flow Sensors are covered by Standard's 3-year/36,000 mile warranty, are available for immediate order and shipment, and are shipped in high-impact Standard® or Intermotor® graphic packaging that reinforces product quality.
The NEW MAF Sensor launch is supported with comprehensive training and marketing materials, including a MAF-specific printed application and illustrated guide; New MAF brochure; professional installation videos; and MAF-specific PTS On-Demand training.
iSweek（http://www.isweek.com/）- Industry sourcing & Wholesale industrial products
Standard® NEW MAF sensors are tested and calibrated with sophisticated automated equipment so they match OE output precisely and perform flawlessly. And SMP-manufactured units feature many design improvements including thicker walls, upgraded componentry and custom-designed platinum sensors. Standard® is the only supplier to offer 'OE or Better' quality in a full line program.
"This launch establishes our commitment to providing the highest-quality replacement parts for air and fuel sensor categories," said Phil Hutchens, Vice President Engine Management Marketing, SMP. "Our new line offers technicians an all-new MAF Sensor rather than remanufactured, ensuring product quality and precise system operation."
All New Standard® Mass Air Flow Sensors are covered by Standard's 3-year/36,000 mile warranty, are available for immediate order and shipment, and are shipped in high-impact Standard® or Intermotor® graphic packaging that reinforces product quality.
The NEW MAF Sensor launch is supported with comprehensive training and marketing materials, including a MAF-specific printed application and illustrated guide; New MAF brochure; professional installation videos; and MAF-specific PTS On-Demand training.
iSweek（http://www.isweek.com/）- Industry sourcing & Wholesale industrial products
2016年1月26日星期二
In-Line Mass Flow Sensor offers 1-3% accuracy
Based on Microwave Doppler Effect technology, Quanti Mass Flow Sensor
provides reproducible, non-contact, in-line mass flow measurement of
quantities in pneumatic conveying and free-falling processes without use
of weigh scales. Unit features sturdy, non-intrusive design that
minimizes maintenance. Available with DIN-rail transmitter or local
interface controller, sensor is suitable for powders, dust, pellets, and
granular up to 0.75 in.
In-Line Mass Flow Measurement Sensor
Monitor Technologies introduces the QuantiMass solids / mass flow sensor that measures the flow of quantities in pneumatic conveying & free-falling processes.
The sensor is based on the latest Microwave doppler effect technology to provide fast, accurate (typically 1 to 3%) and reproducible in-line measuring without the use of weight scales. The QuantiMass is ideal for monitoring material flow rates to verify blending mixture ratios. The sensor can also be used to monitor for variable flow quantities due disturbances like different densities. The sturdy, non-intrusive design of the sensor minimizes maintenance. In addition, the compact size of the sensor makes for easy installation into existing processes. Provides non-contact, in-line mass flow measurements for most bulk solids and many dusts (like coal dust and saw dust). Suitable for powders, dust, pellets, and granular up to 0.75 inch (2cm). Available with DIN-rail transmitter or local interface controller.
iSweek（http://www.isweek.com/）- Industry sourcing & Wholesale industrial products
In-Line Mass Flow Measurement Sensor
Monitor Technologies introduces the QuantiMass solids / mass flow sensor that measures the flow of quantities in pneumatic conveying & free-falling processes.
The sensor is based on the latest Microwave doppler effect technology to provide fast, accurate (typically 1 to 3%) and reproducible in-line measuring without the use of weight scales. The QuantiMass is ideal for monitoring material flow rates to verify blending mixture ratios. The sensor can also be used to monitor for variable flow quantities due disturbances like different densities. The sturdy, non-intrusive design of the sensor minimizes maintenance. In addition, the compact size of the sensor makes for easy installation into existing processes. Provides non-contact, in-line mass flow measurements for most bulk solids and many dusts (like coal dust and saw dust). Suitable for powders, dust, pellets, and granular up to 0.75 inch (2cm). Available with DIN-rail transmitter or local interface controller.
iSweek（http://www.isweek.com/）- Industry sourcing & Wholesale industrial products
订阅：
博文 (Atom)