ProtEX-MAX PD8-7000 Explosion-Proof Temperature Meter Instruction Manual
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Relay and Alarm Operation Diagrams
The following graphs illustrate the operation of the relays, status LEDs, and ACK button.
High Alarm Operation (Set > Reset)
For Manual reset mode, ACK can be pressed anytime
to turn "off" relay. To detect a new alarm condition, the
signal must go below the set point, and then go above
it.
Low Alarm Operation (Set < Reset)
For Manual reset mode, ACK can be pressed anytime
to turn "off" relay. For relay to turn back “on”, signal
must go above set point and then go below it.
High Alarm with Fail-Safe Opera-
tion (Set > Reset)
Note: Relay coil is energized in non-alarm condi-
tion. In case of power failure, relay will go to
alarm state.
Low Alarm with Fail-Safe Operation
(Set < Reset)
Note: Relay coil is energized in non-alarm condi-
tion. In case of power failure, relay will go to
alarm state.
