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Form 924 (05.18) ©SOR Inc.
Set Point and Sensor Monitor Calibration
The failsafe mode on either rising or falling level can be easily changed in the field. See
procedure and chart below.
NOTE: Upon loss of power, or some component failures, the output relay is de-energized and its
contacts return to the “shelf position” NC (Normally Closed) to signal an alarm condition
regardless of process level.
Sensor Monitor Calibration
Disconnect the probe wire from the circuit.
Turn the SENSOR MONITOR adjustment until the red Sensor Monitor LED just lights.
The circuit will close the normally open contacts on the ALARM relay.
Reconnect the probe wire to the circuit board. The circuit will return the ALARM relay
contacts to the normal state.
Set Point Calibration
Disconnect line power supply.
Remove the housing cover.
Rotate DIFFERENTIAL adjustment 25 turns clockwise, or until you hear the
potentiometer
click.
Look at the chart below to determine the correct failsafe switch setting for your application.
Units in Hazardous Locations — Prior to calibration, make sure that the
work area is declassifi ed before removing the explosion proof cover to
calibrate the unit. Failure to do so could result in severe personal injury or
substantial property damage.
Continuity Chart
Fail Safe
HI
Fail Safe
LO
NC1
C1
NO1
NO2
C2 NC2
NC1
C1
NO1
NO2
C2 NC2
NC1
C1
NO1
NO2
C2 NC2
NC1
C1
NO1
NO2
C2 NC2
Switch Position
Process Level
Terminal Co ntinuity
