Teledyne 4040 - Methane / Nonmethane analyzer - Manual (Page 62)

Operation Series 4040
62 Teledyne Analytical Instruments
SOURCE: The alarm can react to measurement levels of CH4,
NMH, or THC (the sum 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.
4.14 The Range Function
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-> Range Select: Man
Autorange Src: THC
Man Rng: R1
R1: 0-100.0 ppm
R2: 0-1000.0 ppm
R3: 0-10000.0 ppm
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The value of the upper limit of the currently selected range (AUTO
or MANUAL) affects the voltage and current of the analog outputs on
the rear of the analyzer as well as contact closures indicating which
range is current. The Analog outputs on the rear of the analyzer
represent the proportion of the analysis concentration to the currently
selected range limit.
MANUAL/AUTO RANGE SELECT: In Manual Range select, the
Range indicated on the second line 'Man Rng:' is maintained as the
current range of operation. In Auto Range select, the software
determines the smallest range whose limit is larger than the analysis
concentration.
AUTO RANGE SOURCE: The automatic selection of range can
be set to select according to the CH4, NMH, or THC concentration.