Organic carbon compounds are often specified in terms of carbon mass.
Recent developments in TOC (total organic carbon) analysis have resulted
in considerable improvements, which allow for complete and direct
measurement of the quantity of carbon with a biological source. Where
there are fluctuations and differences, the cause and effect on
biological processes in waste water study can be identified.
The TIC (total inorganic carbon) is usually removed from a sample by
means of purging prior to oxidizing the residual organic carbon in the
water sample to carbon dioxide (CO2) and then quantifying the amount of
CO2 generated (Figure 1).
Figure 1. Typical TOC process
A number of techniques are available which can be used to oxidize the
organic carbon, such as oxygen, UV radiation, wet chemistry, or heat to
generate CO2. Regardless of the method, the resulting CO2 is dissolved
in a carrier gas, such as oxygen. This carrier gas is passed via the TOC
level will also be higher and the water sample will be more
contaminated.
Based on the cleanliness of the water being analyzed and the methods
utilized, different concentrations of CO2 can be anticipated in the
carrier gas, from wastewater to drinking water. Edinburgh Sensors’
Gascard® NG is a high performance OEM gas detector that provides
real-time measurement of CO2 0-500ppm to 0- 3%.
OEM Gascard® NG
A suitable OEM solution for TOC monitoring, Gascard NG can be easily
integrated into a range of gas detection solutions where lasting
stability, high quality, superior repeatability and reliable measurement
of carbon , CO2 and methane gas concentrations are needed. These
features are due to Edinburgh Sensors’ proprietary dual wavelength fail
to safe InfraRed NDIR gas sensor technology. The Gascard NG range offers
ideal solutions for measuring and testing industrial as well as
environmental gases. Table 1 shows the Gascard NG models for gas
measurement range of CO2.
The Gascard NG from Edinburgh Sensors comes with different interface
options, such as true RS232 communication, analogue 4-20 mA/0-20 mA/0-5
v, serial interface for interfacing relay alarms and optional on board
LANsupport. The on-board firmware is capable of supporting a modern
graphical display or a conventional 4 segment LCD.
In addition, the Gascard NG series needs only minimum maintenance and
thus eliminates significant amount of costs. Automatic pressure and
temperature correction features allow real-time environmental condition
measurements and thus provide consistent measurement and exact
concentration readings of target gases.
The sensor head and electronics of the Gascard NG series are positioned
on a Eurocard PCB with several bit-switches, which allow users to
control different aspects of the sensors behaviour such as filter type
and analogue output selection.
The Gascard NG is backward compatible with outputs from current
generations of Gascard series and includes onboard true RS232
communications with the option of TCP/iP communications protocol and
on-board data logging. With built-in features for multi-sensor and
multigas operation, the Gascard NG can integrate additional gas
detection technologies.
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