Alarm Conditions
Alarm (High gas reading)
When the gas concentration reaches the predefined alarm set point then the alarm
condition exists. The sensor will flash “ALr” for few moments and then display the
gas reading. Also the alarm relay is energized.
For oxygen the alarm is 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%
Fault (Sensor Fail)
PT295 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
sensor displays “FLt” when sensor in Fault.
PT295 Series Toxic Sensor Rev 5.1
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