Alarms
| 5-1
ALARMS
Alarm Relays
There are four (4) alarm relays maintained by the analyzer. All relays are
failsafe; this means that an open contact indicates a problem.
• Relay 1 is dedicated as a System Alarm
• Relay 2 is dedicated as a Data Valid Alarm.
• Relays 3 and 4 are user-configurable.
System Alarm - Relay 1
Relay 1 is used to indicate a system alarm condition. A system alarm oc-
curs when there is a condition that prevents the analyzer from making a
measurement. When this happens, the relay contact opens and activates
the alarm. Either Relay 3 and Relay 4 can also be configured optionally to
trigger a system alarm condition. Refer to Appendix C for details on the
operation of the analyzer state machine.
Data Valid Alarm - Relay 2
Relay 2 is used to indicate that the current concentration measurements
and analog outputs are valid. If the data is NOT valid, the relay contact
is open. Refer to Appendix C for details on the operation of the analyzer
state machine.
Programmable Relays - Relay 3 and Relay 4
Relays 3 and 4 can be used to configure a selected parameter, its upper
limit, and its lower limit. If the selected parameter is out of range, the cor-
responding relay contact opens and an alarm activates.
Relays 3 and 4 can optionally be configured as a system alarm. Refer
to Chapter 4 in this manual for details.
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