PT395 Series Detector
Start Up
1. After installation apply power to the unit. Allow the sensor to warm up for at least
15 minutes. For Ammonia sensors allow at least 2 hours for warm up time. Upon
power up the unit will display 00 on the LED display. If the LED display does not
indicate 00 then check to see if the ribbon cable connector is properly inserted. If
necessary unplug the ribbon cable and plug it back again. The connector is keyed
and can be inserted only one way.
2. During the warm up time the sensor may display reading other than 00. However,
the 4-20mA analog output will remain at 4mA (0 reading) and the alarm relay is
inhibited. The reading will slowly goes down to zero. After warm up time the
sensor will return to its normal operation. Refer to section “Adjust Alarm Set
Points” to modify alarm parameters. Change the alarm levels if different set-point
is desired.
3. The sensors are calibrated at the factory before they are shipped. However, it is a
good practice to check the accuracy by simply applying the calibration gas after
the warm up time and check to see if the concentration displayed matches with
concentration of the test gas within tolerance. If calibration is required then follow
the steps in the Calibration procedure. If the unit is powered up for the first time
then allow at least 15 to 20 minutes before attempting calibration or bump test.
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