2017年6月30日星期五

Zirconia Oxygen Sensors


Zirconia Oxygen Sensors

Manufacturers Of Robust And Reliable Zirconium Dioxide Oxygen Sensors

SST's range of zirconium dioxide oxygen sensors use a unique closed loop measurement system. While the sensor continuously measures the oxygen level, a heartbeat signal is also generated providing an immediate warning of any failures.
The sensing technology and stainless steel construction allow these sensors to be used in environments where extreme pressure, temperature and high humidity are present.
SST's zirconium dioxide oxygen sensors offer a range of housing styles, cabling and electrical connections.
The sensors can be purchased alone or with integrated electronics offering digital or analogue industry standard outputs.  Their long operating life is due to the non-depleting sensor cell technology. No reference gas is required and easy single point calibration can be performed in any known gas including fresh air. The Zirconia Oxygen Sensors can measure over a wide oxygen range (0.1 to 100% O₂).
The reliability of these sensors means that they are used globally in applications ranging from composting to fuel tank inerting in civilian airliners.

2017年6月28日星期三

Oxygen Sensor Interface Board

O2I-Flex Oxygen Sensor Interface Board FEATURES

• Provides the electronics necessary to power and control SST’s range of zirconium dioxide (ZrO2 ) sensors
• Externally triggered automatic or manual calibration. Calibration can also be initiated via an on-board push button
• Power and sensor operating LEDs
• Removable polarised screw terminals for easy wiring


O2I-Flex Oxygen Sensor Interface Board BENEFITS
• Adaptive software filtering provides a fast sensor response coupled with a stable oxygen output
• High accuracy linear output
• Can be calibrated in fresh air (20.7% O2 ) or in any other known O2 concentration


O2I-Flex Oxygen Sensor Interface Board TECHNICAL SPECIFICATIONS

Supply voltage
24V DC ± 10%
Supply current
600mA max. at 24V DC
Digital output
RS232
Analogue output
4 ~ 20mA; load 100 ~ 600Ω
or  0 ~ 10V DC ; load 10kΩ min
Temperature limits 
    Storage:
    Operating:

-10°C to +70°C
-10°C to +70°C
Oxygen pressure limits
 1 ~ 1000mbar                                  



O2I-Flex Oxygen Sensor Interface Board OUTPUT VALUES

Oxygen range (analogue output)
0.1 ~ 25% Oor 0.1 ~ 100% O2
Oxygen range (RS232 output)
0.1 ~ 100% O2
Accuracy after calibration
1% O2
Repeatability after calibration 0.5% O2
Output resolution:
    0 - 10V DC:
    4 - 20mA:
    RS232: 
0.01V
0.01mA
0.01% O2
Response time (step 10 - 90%)
    Fast response sensor connected:
    Standard response sensor connected:
< 4s
< 15s 
Initial warm up time (till stable output)
5 ~ 10mins
Output inactive start up delay (heater warm up)
60s

2017年6月15日星期四

Miniature Infrared CO2 Sensor Module - S8-4B

S8-4B Miniature Infrared CO2 Sensor Module General Description
The S8-4B CO2 sensor module is designed to serve as a CO2 safety switch when built-in into kerosene heaters. The sensor utilizes reliable and highly accurate infrared gas sensing technology. The electronic circuitry is optimized for low power consumption. Because of low current consumption the sensor is suitable for battery applications and has an average current consumption of 2 mA.

S8 can be customized for a variety of alarm and control applications.

S8-4B Miniature Infrared CO2 Sensor Module  Key technical specification

Item
S8-4B Article no. 004-0-0061
Target gas
CO2
Operating Principle
Non-dispersive infrared (NDIR)
Measurement range
400 to 32000ppm (represented internally in digital format)
Measurement interval
30 seconds
Accuracy
±1000ppm at alarm points between 7000 and 9000 ppm (Note 1)
Pressure dependence
+ 1.6 % reading per kPa deviation from normal pressure
Gas diffusion response time
2 minutes by 90%
Operating temperature
-5 to 60 ºC
Operating humidity range
0 to 95% RH non condensed
Storage temperature
-40 to +70°C
Storage Environment
0-95% RH non condensed non corrosive gases, no contamination to kerosene
Dimensions (mm)
61 x 20 x 8.5 mm (max dimensions)
Weight
< 10 grams
Power supply
4.5 to 7.0 VDC unprotected against surges and reverse connection
Power consumption
250 mA peak, 2 mA average
Life expectancy
5+ years in normal indoor / office environments
Compliance with
Tested according
Emission EN 61000-6-3:2007, EN 61000-6-4:2007
Immunity EN 61000-6-1:2007
RoHS directive 2011/65/EU
Output Alarm, Open Drain
Open drain FET; 7V/ 800mA, protected by a zener diode, normally
open, 100kWpull-up resistor to power (+).
8000/6500 (Alarm/Release) Normal state is open.
Transistor conducting at (CO2 > 8000ppm) OR (Unloaded Power
voltage < 4.5V) OR (Loaded Power voltage < 4.0V) OR (Sensor
Failure detected by self-diagnostics)
Maintenance
Forced calibration (assuming 400 ppm exposure).
Self-diagnostics
Full self-diagnostics at power up and continuously running self-diagnostics 
at every measurement.


Note 1: Accuracy is specified over operating temperature range. Specification is referenced to certified calibration mixtures. Uncertainty of calibration gas mixtures (+-2% currently) is to be added to the specified accuracy for absolute measurements.

2017年6月13日星期二

Dust Sensor Module DSM501B

Dust Sensor Module for Air Quality Monitor
Dust Sensor Module DSM501B Description
Dust Sensor Module: DSM501 series detects the level of indoor airborne dust, particles, and pollen, and ideal for use in stand-alone air cleaner or IAQ monitor. PWM output of the sensor can be directly connected to μ-com to control fan speed or ventilation and also to display the level of particles. Detectable size of particle is limited to minimum 0.7 μm, and the application for smoke or fire alarm is prohibited.
Dust Sensor Module DSM501BType:
DSM501A : 2mm pitch connector type (20010WR-05).
DSM501B : 2.5mm pitch connector type (S5B-EH).

Dust Sensor Module DSM501B Electrical characteristics:
Supply voltageDC5V±10%
Power consumption90mA
Operating temperature range-10~ +65°C
Operating humidity range95%RH or less (without dew condensation)
Recommend storage condition-20~ +80°C
DimensionW59 * H45 * D20 (mm)
Detectable particle sizeapprox. 1um (minimum)
Detectable range of concentration0 ~ 1.4mg/m3
Output signalPWM (pulse width modulation)
Time for stabilization1 minute after power turned on
Sensor characteristicsTo be maintained in between the upper limit and
lower limit of the standard dust sensor unit
Dust Sensor Module DSM501BFeatures: 
• PWM output
• Easy installation
• Single power supply
• Compact size and lightweight

Dust Sensor Module DSM501B Application: 
• Ventilator etc
• Air conditioner
• Air quality monitor
• Air cleaner or Air purifier

2017年6月5日星期一

The world's fastest battery-powered NDIR CO2 sensor


The world's fastest battery-powered NDIR CO2 sensor

Gas Sensing Solutions (GSS) Ltd, the LED-based NDIR detector specialists, continues to push the boundaries for CO2 detectors with the launch of its new SprintIR6S.  GSS' unique SmartIR™technology has enabled it to create a sensor that can take up to 20 readings per second, which is a world record for NDIR CO2 detectors, and has a six times faster response rate than the SprintIR CO2 sensor*.
Ralph Weir, GSS' CEO, explained, &quot;We are the only company producing CO2 sensors using LEDs and photodiodes and, as we make the LEDs and photodiodes ourselves, we have been able to develop ultra-fast response times that no other NDIR sensor can match.  Typical NDIR CO2 detectors take several seconds or even minutes to take a reading - because they use slow-reacting IR sources, which need time and energy to warm up, like MEMS hotplates, micro-bulbs or filament-based micro-lamp technologies. Our LEDs, by contrast, are Solid State emitters, and illuminate almost instantly.  With the new SprintIR6S, we've also minimized the sample volume down to only 2ml, which enables us to achieve our fastest ever response rates*.  This puts us in a unique position to open whole new application areas for CO2 monitors that could never be addressed by slow responding sensors based on traditional IR sources.&quot;
Applications for this new class of ultra fast CO2 sensors include health where they can capture rapidly changing CO2 concentrations in the breathing cycle to provide diagnostic information, which can be used in fitness testing, breath analysis/measurement, capnography, sports science and veterinary to name a few.  In Industrial Health and Safety applications, such as factories where CO2 is used for modified atmospheres to delay packaged food from spoiling, they can provide ultra fast detection of rising CO2 levels.  Even a doubling or tripling of normal CO2 levels can affect concentration and productivity with higher levels having increasingly deleterious effects on health right up to unconsciousness and death. 
&quot;A leak from a CO2 canister or similar can push CO2 levels up from the normal 400ppm to several thousand ppm in seconds,&quot; added Ralph Weir.  &quot;You cannot smell CO2 and it is colorless.  Yet it can present serious health problems at raised concentrations so, the sooner an alarm is raised, the sooner people can take remedial action.  For example, restaurants and pubs usually have CO2 cylinders in the basement for the drinks but basements typically have poor ventilation so an undetected CO2 leak could suddenly raise the CO2 level when someone was in the basement and render them unconscious - or dead.  Our new sensors can give the earliest possible warning.&quot;
GSS' multi-patented SmartIR™ technology detects the presence of CO2 by detecting how much light is absorbed by CO2 molecules as light passes through the sample gases - called Non-Dispersive InfraRed (NDIR) absorption.  CO2 absorbs between 4.2 and 4.4 microns so that its presence is easily detected, and the amount of light absorbed indicates how much CO2 is present. Typically, CO2 detectors use a miniature heater (such as MEMS devices like micro hotplates, microlamp/microbulb or filament heater) to generate a range of wavelengths that have to be filtered down to the wavelengths needed, which is wasteful and energy inefficient, especially as a lot of heat is produced.  By contrast, GSS developed the world's first commercial, mid-range IR LEDs that are specifically tuned to emit just at 4.2 to 4.4 microns, making them highly energy efficient.  As a result, GSS CO2 sensors are the only NDIR CO2 sensors that can be powered by batteries - a single lithium cell can power a SmartIR sensor for up to ten years.
At less than a cubic inch (23.8mm in diameter and 24mm tall), the SprintIR6S operates at between 3.25 and 5.5V, with a power consumption of only 35mW.  The SprintIR6S is available in measurement ranges from 0%to 100%.
GSS will be revealing the new SprintIR6S detectors at the Sensor + Test show in Nuremberg, Germany from 30 May to 1 June 2017.
High Speed Carbon Dioxide Sensor NDIR CO2 Sensor SprintIR Summary
SprintIR is a high speed (20 Hz) CO2 sensor, ideally suited for applications which require capture of rapidly changing CO2 concentrations including metabolic assessment and analytical instrumentation.

High Speed Carbon Dioxide Sensor NDIR CO2 Sensor 20Hz 0-100%

Fast, Accurate Carbon Dioxide Sensor
The SprintIR carbon dioxide sensor is the fastest, most accurate CO2 sensor on the market. A breakthrough in NDIR technology, the SprintIR uses advanced solid state Indium Antimonide LED’s and detectors to offer a robust sensor with no moving parts, no heated filaments, and incredibly low power requirements. The sensor comes in four versions - from 0% to 100% - all capable of the same high-speed CO2 measurement. This makes the SprintIR especially useful in biological applications.

• High speed sensing (20Hz)
• Measurement ranges from 0 to 100%
• 3.3V supply
• Low power requirement 35mW
• Flow through adaptor (Optional)


High Speed Carbon Dioxide Sensor NDIR CO2 Sensor Specifications
CO2 Measurement
Sensing Method Non-dispersive infrared (NDIR) absorption
Patented Gold-plated optics
Patented Solid-state source and detector
Sample Method Diffusion(Standard) / Flow through (with flow-through adapter)
Measurement Range 0-5%, 0-20%, 0-60%, 0-100%
Accuracy ±70 ppm +/- 5% of reading
Measurement Noise <10% of reading with no digital filtering
Non Linearity < 1% of FS
Pressure Dependence 0.1% of reading per mbar in normal atmospheric conditions
Operating Pressure Range 950 mbar to 10 bar
General Performance
Warm-up Time < 1 minute
Operating Conditions 0°C to 50°C (Standard)
-25°C to 55°C (Extended range)
0 to 95%, RH non-condensing
Recommended Storage -30°C to +70°C
Electrical/ Mechanical
Power Input 3.2 to 5V. (3.3V recommended)
Peak current 100mA
Average Current <15mA
Power Consumption 35 mW
Output UART only