FOR IR SENSORS:
The output of the IR sensors can be disrupted by sudden changes in
temperature. If there is an excessive change in the ambient
temperatures, gas sample temperature or flow rate, then the output
signal will be momentarily 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 original pressure.
Do not expose the sensor to corrosive gases such as Hydrogen
Sulphide.
Do not allow condensation to occur inside the sensor.
CALIBRATION ALERT: Gas detection instruments are potential life-saving
devices. Recognizing this fact, calibration for the toxic and catalytic LEL
sensors should be at least at quarterly intervals, while the infrared sensor
should be calibrated on an annual basis with function test every 6 months.
Further, Industrial Scientific - Oldham recommends prudent testing and/or
includes calibration after a gas alarm. All calibration service to sensors
should be recorded and accessible.
CAUTION: For safety reasons, this equipment must be operated and
serviced by qualified personnel only.
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