CODEL Operation and Maintenance Manual
Issue : A Rev. : 3 Date : 13/11/2018 Ref. : 100351
P a g e | 4
2 Principles of Operation
2.1 Electro Chemical Cell – CO/NO/NO
2
In order to measure the level of gas (CO/NO/NO
2
), the Tunnel Tech 500 uses an electro chemical cell to
convert the gas in to readable data. The gas diffuses in to the sensor and interacts with the electrode within
the cell. This causes a chemical reaction in which the gas is reduced or oxidised. The electrochemical reaction
results in an electric current which can then be read, with the generated voltage being linear to the gas
response, and the detector level is derived from the incoming voltage and subsequently a gas measurement.
2.1.1 E-Cell Calibration
the instruments should be calibrated when it is expected measured gases are zero, this is achieved by purging
the instrument with nitrogen. The instrument can be calibrated by selecting a calibrate mode where, the
instrument records the detector levels during zero conditions which are to be used as reference during normal
measurement.
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