PureAire Monitoring Systems, Inc.
10/25/07
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7.2.3 Alarm Relay Configuration (Polarity)
Alarms 1, 2, and 3 may be configured in for latching / non-latching operation,
fail-safe operation, etc. The exact configuration of these alarms is determined by
the positions chosen on the FUNCTION DIP switch.
Switch
ON
OFF (marked as OPEN)
1
Alarm 1 = High Trip
Alarm 1 = Low Trip
2
Alarm 1 = Non-Latching
Alarm 1 = Latching
3
Alarm 1 = Normal
Alarm 1 = Fail-safe
4
Alarm 2 = High Trip
Alarm 2 = Low Trip
5
Alarm 2 = Non-Latching
Alarm 2 = Latching
6
Alarm 2 = Normal
Alarm 2 = Fail-safe
7
Alarm 2 = No acknowledge
Alarm 2 = Acknowledge
8
Alarm 3 = Fault
Alarm 3 = Trips with Alarm 2
IMPORTANT: PureAire recommends that Alarms 1 and 2 always be set for High Trip
(activate when measured gas value rises about setpoint) except for instruments
monitoring for oxygen deficiency. Setting these alarms for Low Trip will cause them to
alarm when the measured gas concentration falls below the setpoint level.
