Green G36P - Page 14

Analyzer Installation & Connections
14
Relay
No.
Relay function Terminal Connections
Relay 1
Alarm High/Low O
2
level
Terminals 1.1-2.1-3.1
(NC-COM-NO)
Inverted
Normally energized
Relay 2
Alarm High High O
2
level
Terminals 4.2-5.2-6.2
(NC-COM-NO)
Inverted
Normally energized
Relay 3
System failure alarm*
Terminals 7.3-8.3-9.3
(NC-COM-NO)
Inverted
Normally energized
Relay 4
Calibration Span Gas
Terminals 10.4-11.4-
12.4
(NC-COM-NO)
Normally
de-energized
The Stack Gas Oxygen Analyzer relay functions and connections are as follows:
Relay
No.
Relay function Terminal Connections
Relay 1 Alarm
High/Low/High-High
O
2
level
Terminals 1.1-2.1-3.1
(NC-COM-NO)
Inverted
Normally energized
Relay 2 System failure alarm Terminals 4.2-5.2-6.2
(NC-COM-NO)
Inverted
Normally energized
Relay 3 Auto Back-flushing Terminals 7.3-8.3-9.3
(NC-COM-NO)
Normally
de-energized
Relay 4
Auto-Calibration
Terminals 10.4-11.4-
12.4
(NC-COM-NO)
Normally
de-energized
Alarms
The values for three O2 level alarms (Low, High, and High-High) can be set following
instruction in section 5.2.
The system failure alarm includes a sensor alarm and alarm for open loop of the analog
outputs.
Normally energized
Normally energized means that the relay is energized in the alarm free condition during
operation. The relay will be de-energized when there is an alarm or when the supply volt-
age disappears from the analyzer. Thus, the normally energized relays will give a fault
signal in the event of failure of power to the analyzer.