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The transmitter TCOD-IR are suitable for spot check and continuous measurement of carbon
dioxide concentrations.
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The transmitter, for a 0-3000 ppm, 0-10000 ppm, 0-5% CO2 volume, 0-10 % CO2 volume, 0-50%
CO2 volume measurement ranges, has been approved for the detection of carbon dioxide
concentrations in ambient air corresponding to the German Technical Regulations for the Use of
Drink Dispensers (TRSK 400) and has thus been assessed by an accredited testing institute in
compliance with regulation TRSK 313. The components of the gas detection system are each
approved according to the highest requirements of standards EN50081-2 (generic emission for
household appliances and the light industry) and EN 50082-2 (generic immunity for the industry).
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The sensor element of the TCOD-IR operates by the principle of infrared absorption. This principle
provides :
- precise & accurate measurements
- high selectivity
- poison resistance
The gas to be measured enters the measuring cell via the filter.
An IR source emits light with a large portion in the infrared spectrum through the measuring cell.
CO
absorbs a certain wavelengh of the light in the IR spectrum. This absorption is converted into
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an electric signal. To improve stability, the IR source is clocked. The sensor electronics process
this signal and provide a 4-20 mA output signal from the detector corresponding to gas
concentration.
This output signal is logarithmic with respect to the CO
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For the specification of each transmitter, please see relevant data sheets.
Tests have proven a high resistance of the sensor element against condensation which should be
avoided due to the measuring principle. Consequently, the transmitter should be protected against
warm humid draughts (eg outlets of air conditioning or open windows).
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concentration.
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- Calibration and Adjustment
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