PT395 Series Detector
Operation
Normal Operation
The sensor is considered in normal operation after startup procedure is complete
and is not indicating any alarm or sensor fail (FAULT) condition.
Gas Reading Display
The sensor displays the gas concentration in % volume or ppm (parts per million)
by volume.
Signal Output 4-20mA
The 4-20mA signal output is directly proportional to the detection range of the
sensor. The output signal generated is proportional to the gas concentration
displayed on the transmitter LCD.
Use the formula below to compute the mA output for any given gas concentration
or vice versa.
Formula to convert gas reading to mA:
( 16 x gas_reading ) + 4 = Analog output (mA)
Detection Range
Formula to convert mA to gas reading:
( mA Output - 4 ) x Detection Range = gas_reading
16
(Note: Detection Range is the full scale range of the sensor)
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