Oldham OLCT 200, User Manual, Page: 71 / 80

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OLCT 200 User Manual | 71
9.2.2 IR-Propane Sensor
The propane IR sensor is factory configured to accurately monitor propane gas. As
seen in Figure 9-2, the cross-sensitivity of the propane IR sensor does permit accurate
measure of other combustible gases via a cross-reference factor. It should be noted
however, that the Propane-IR sensor WILL respond to other combustible gases and is
not Propane specific.
Figure 9-2 Cross-sensitivity chart for OLCT 200 Propane IR Sensor.
The output of the IR sensor can be disrupted by sudden changes in temperature. If
there is an excessive change in the ambient temperature, gas sample temperature or
flow rate, then the output signal will be monmentarily frozen. Correct operation is
restored when the effects of the transient have settled. Rates of change in the ambient
temperature should be restricted to 2

C/minute and gas flow rates kept below 0.6
L/minute.
Extreme pressure variations will cause errors in readings. The unit should be
recalibrated if the atmospheric pressure change is greater than 10% from the orignial
pressure.
Do not expose the sensor to corrosive gases such as Hydrogen Sulphide.
Do not allow condenseation to occur inside the sensor.