Ametek CEM/Humox, User Manual

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4-30 | Thermox CEM/Humox Analyzer
Service Alarm
The service alarm operates as normally closed (service alarm condition
causes open contacts).
The service alarm provides an alarm that alerts you of possible system problems that
require attention. Events that can trigger the service alarm to activate are as follows:

Error condition (detected by software)

System operational variance (such as an over-temperature or under-temperature
condition)

Calibration failure

Verification failure

Control unit power failure
Watchdog Relay
During normal system operation, the watchdog relay operates as nor-
mally closed (system failure causes open contacts).
The watchdog alarm relay deenergizes when the system watchdog timer times
out. The watchdog timer will time out and cause the control unit to reset itself to
prevent the control unit from becoming “lost” due to such things as noise spikes or
power surges. You can use this relay to activate a remote indicator to notify you if
the watchdog timer times out.
In addition, the control unit reads the watchdog after reset, and beeps for a brief
time if the reset was caused by a watchdog condition. Pressing the reset keys si-
multaneously (hidden keys to the left and right of the Setup key) for a long enough
time will in turn cause a watchdog, which will indicate as a beep after the system
restarts upon release of the reset keys.
NOTE
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NOTE
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