Switching Output State - Prosense Safevader Series User Manual

Switching Output State

In normal operation fault relay is in switched off position, only when the fault relay coil is
energized (contact closed) are the output states valid. The evaluation of the fault relay must be
performed by an external device.
Alarm Relay-1
Indicate if the measured concentration of gas is greater than alarm 1 on-threshold by energising
the first normally energised alarm relay, with the relay response following the calculated gas
level with a delay of no more than 5 second.
Alarm Relay-2
Indicate if the measured concentration of gas is greater than alarm 2 on-threshold by energising
the second normally energised alarm relay, with the relay response following the calculated gas
level with a delay of no more than 5 second.
Fault relay output
Fault relay should be designed as closed circuit / de-energise to trip principle and provide device
state information. As it is a switching output it has two states and behaves as given in below
table:
Status Output(mA)
Power-off
Warm-up
Fault
Calibration
Zero gas
Alarm-1 level Adjustable
Alarm-2 level Adjustable
Full Scale Gas
Over-range
Under-range
Other than given states the detector is working fine and fault relay will be energised and relay
contact will be open circuit.
PRS-UM-SV-EN-Rev1.0-16.12.2022
Fault Relay
Energy (Coil) Circuit (Out)
0 De-energized Contact close
3 De-energized Contact close
2 De-energized Contact open
3 De-energized Contact close
4 Energized Contact open
Energized Contact open
Energized Contact open
20 Energized Contact open
22 Energized Contact close
2 De-energized Contact close
Table 6: SAFEVADER Series Switching output states and indications
Alarm 1 Relay
Energy (Coil) Circuit (Out)
De-energized Contact open De-energized Contact open
De-energized Contact open De-energized Contact open
De-energized Contact open De-energized Contact open
De-energized Contact open De-energized Contact open
De-energized Contact open De-energized Contact open
Energized Contact close De-energized Contact open
Energized Contact close Energized
Energized Contact close Energized
Energized Contact close Energized
De-energized Contact open De-energized Contact open
Alarm 2 Relay
Energy (Coil) Circuit (Out)
Contact close
Contact close
Contact close
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