Teledyne GC-Pro/FID - Gas Chromatograph - Manual (Page 85)

GC-Pro FID Operation
Teledyne Analytical Instruments 71
Selecting ALARM 1 displays the following screen:
From this screen you can make Alarm 1 active or defeated,
configure it as a high or low alarm, failsafe or non-failsafe and whether
the alarm will be latching or non-latching by touching the respective
LED’s.
The user can enter the trigger value (alarm setpoint) by touching in
the Trigger Value box. This causes a numeric keypad to display for
entering the value. Hit ENTER to close down the keypad and enter the
value into the Trigger Value box.
The user can also select the group to which the Alarm will be
associated by using the UP/DOWN arrows adjacent to the Source box.
The configurable items are as follows:
DEFEATED: If an alarm is defeated, its relay is de-energized,
regardless of failsafe condition. A defeated alarm does not react to a
transition over its trip point in either direction.
HIGH: If an alarm is set as HIGH, it will not create a new alarm
condition (see latching) if the analysis concentration is below the trip
point, if the analysis concentration is above the trip point, then an alarm
condition will be created or maintained.
FAILSAFE: A non-defeated alarm that is in FAILSAFE mode
energizes an alarm relay in a non-alarm condition and de-energizes an
alarm relay in an alarm condition.
Note: Failsafe condition of an alarm is a software property. This