PT395 Series Detector
Once both alarms have been configured the sensor will return to normal
operation. The alarm configuration is saved in non-volatile memory and is not
lost upon power down.
For oxygen the alarms are activated on the falling edge. For example if the alarm level is set at
18 %, the relay will be energized if the oxygen level is at or falls below 18%
Alarm Relay Terminology
Non-Latching: Relay will be de-activated or Reset itself when the gas
concentration falls below the pre-set alarm level.
Latching Relay will stay active even after the gas concentration falls
below the preset alarm level. The alarm relay must be
manually reset using the internal magnetic switch
To RESET alarms refer to section “Resetting Alarms”
Factory defaults alarm relay setting is Non-Latching
Alarm Conditions
When the gas concentration displayed reaches the predefined alarm set point
then the alarm condition exists. The alarm relay is energized. Also the LED on
the front panel is illuminated.
Fault (Sensor Fail)
The transmitter is in Fault (Malfunction) condition when the sensor assembly
malfunctions. In Fault condition the 4-20mA output generated would be less
than 1.0 mA. The Display will show “Sensor Fail”
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