Figure 13 Relay Contact Connector - Michell Instruments Optidew User Manual

Optidew User's Manual
2.4.2.3. Relay Contacts
There are two sets of relay contacts available via the output connector:
Process Alarm (Relay 1)
This relay changes state to indicate that the process variable has exceeded the alarm set point
value. See section 3.2 for details on how to configure the process alarm trip criteria. This alarm
can also be used to give an early indication that the Optics require cleaning.
System Alarm (Relay 2)
This relay changes state to indicate a fault has occurred which requires operator intervention.
See section 4.6 for detailed information on faults.

Figure 13 Relay contact connector

Pin Label (from left to
right as shown)
N/C
COM
N/O
N/C
COM
N/O
12
Description
Relay 1 Normally Closed
Relay 1 Common
Relay 1 Normally Open
Relay 2 Normally Closed
Relay 2 Common
Relay 2 Normally Open
97551 Issue 4.1, October 2019