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Q. What does the “disabling at power
on” mean with reference to the d.do alarm type on a UDM meter?
Sometimes, when the system is just powered-on,
the measured variable is far from the normal level to be monitored
and a false alarm could occur (figure 1). Selecting the down alarm
with disabling at power on, the alarm is disabled until the variable
reaches the setpoint for the first time. After this event, the alarm
starts to work as a down alarm.
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