PT395 Series Detector
7. Apply the nitrogen gas for about one and a half (1 ½) minute.
8. After minute and a half the sensor will display Adj for 5 to 15 seconds while
making adjustments and recording the calibration data into memory. When
completed the display will starts flashing rapidly. At this time remove the
calibration gas and allow the sensor to clear. Do not remove the nitrogen gas
while Adj is being displayed. Remove the gas only when the adjustment is
completed and the display is rapidly flashing with calibration gas value.
9. The sensor calibration has been successfully completed
10. While the gas from the sensor housing is being cleared the 4-20mA analog output
will be held at 2.0mA and alarm relay will not be activated until the sensor has
returned to ambient oxygen air reading which is 20.9%. Once nitrogen has been
cleared from the head assembly the unit will return to its normal operation. The
2mA level on the analog output line is an indication to any connected gas monitor
that the sensor is in calibration mode thus avoiding any false alarm.
Also refer to “Sensor calibration Flow Chart” for quick calibration review and
“Calibration Error and remedies”
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