Teledyne 4040 - Methane / Nonmethane analyzer - Manual (Page 53)

Operation
Teledyne Analytical Instruments 53
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STANDBY
Switch to Sleep Mode
ENTER-YES ESCAPE-NO
notification if logged out
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Access Restricted
Re-enter Password
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4.6 Setting up an AUTO-CAL
AUTOCAL is not available for standard configurations of the
4040.
4.7 Adjusting the GAIN
The output of the FID is conditioned by an amplification circuit with
3 user-adjustable settings:
0) x1
1) x10
2) x100
The resulting signal is converted to a number. Numbers outside the
range –262144 to 262143 are unreliable and lead to inaccurate
measurements. If the number is outside this range during analysis, the
message 'GAIN TOO HIGH' is shown on the 2
nd line of the display, and
the analyzer is not updated to a new, calculated value. The Gain Too
High message may be removed by pressing the ESCAPE key.
The gain has been set at the factory such that the analyzer will work
reliably within the prescribed range of operation. The user may change
the gain when a different level of sample is to be analyzed.