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Operation
Teledyne Analytical Instruments 49
only during the time the concentration is above the trip point. If that
alarm were LATCHING, the alarm condition would persist (even though
the concentration is no longer above the trip point), until the user
released it.
RELEASING A LATCHED ALARM: When alarm conditions are
present, the main analysis screen will have one of the following
messages: 'AL1-', 'AL-2', 'AL12'. Pressing ESCAPE (in the
main/analysis screen) will release a latched alarm and defeat the alarm
until the pertinent phase is re-completed.
TRIGGER POINT: This is the threshold at which an active alarm
can enter into alarm condition. If an alarm is HIGH, ACTIVE, and set
at 20.00 ppb, then when the analysis concentration is at or above 20.00
ppb an alarm condition is initiated or maintained.
SOURCE: The alarm can react to measurement levels of THC,
SMP, or AVG (the average of the previous 2).
CAUTION: IT IS NOT GOOD PRACTICE TO SILENCE AN
EXISTING ALARM BY SETTING THE ALARM
ATTRIBUTE TO ‘DEFEAT”. THE ALARM WILL NOT
AUTOMATICALLY RETURN TO “ACTIVE” STATUS.
IT MUST BE RESET BY THE OPERATOR BY
PRESSING THE ESCAPE BUTTON. IF IT IS NOT
RESET, YOUR PROCESS WILL BE RUNNING
WITHOUT SAFEGUARDS THIS INSTRUMENT IS
DESIGNED TO PROVIDE.
4.4.12 The Range Function
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-> Range Select: Man
Autorange Src: THC
Man Rng: R1
R1: 0-10.0 ppm
R2: 0-100.0 ppm
R3: 0-1000.0 ppm
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