Honeywell XT Series, Operating Instructions Manual

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XT Series Personal Gas Detector 20
16. Accuracy Statement
To achieve optimal accuracy, the detector should be periodically supplied with a known
concentration test gas, and if the readings are outside of 15% of the applied gas concentration,
a span calibration should be performed, under conditions of standard temperature (15°C to
25°C), humidity and pressure.
Poisons should not affect the accuracy of the XT but certain compounds can block the gas access
port of the sensor, such as silicone oils, giving a lower than expected reading.