4-28 | Thermox TM2000 Oxygen Analyzer
The Alarm Key allows you to set control unit alarm information. This
includes the following:
Define whether Alarm 3 activates based on oxygen levels, the start of a
calibration or the start of a verification. (Select Function).
Define for each oxygen alarm (Alarms 3 and 4) whether the alarm
should be a high or low alarm (Alarm Configure). If you selected Hy-
drocarbon Upset under the Sensor Config. option from the Setup Key,
Alarm 4 is fixed as both a high oxygen alarm and as a hydrocarbon
upset condition alarm.
Define whether alarm relays should energize or de-energize on alarm
(Relay Configure). The selection you make using the Relay Configure
menu option applies to all alarms except the watchdog and service
alarms, which always de-energize on alarm.
Define alarm set point values (Alarm Set Points). Whether these
alarms are set to activate for high or low alarm conditions is defined
using the Alarm Configure menu option.
View exception log data (Exception Log). The exception log provides a
history of events, such as system or error messages, alarm conditions,
and the start of calibrations or verifications.
Overview of Alarm Functions
Figure 4-7 provides an overview of how alarms can be set:
Alarms 1 and 2 are reserved for the watchdog alarm (Alarm 1) and the
service alarm (Alarm 2). These alarms are not software selectable.
The Select Function menu option applies only to Alarm 3.
The Relay Configure menu option applies to all alarms except for the
watchdog and service alarms, which always de-energize on alarm (fail
safe).
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