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Operating Instructions

Model GFC7000TA Carbon Dioxide Analyzer

Teledyne Analytical Instruments

138

6.13.7. Pressure Calibration

A sensor at the exit of the sample chamber continuously measures the pressure of the sample gas. This
data is used to compensate the final CO

concentration calculation for changes in atmospheric pressure

and is stored in the CPU’s memory as the test function PRES (also viewable via the front panel).

NOTE

This calibration must be performed when the pressure of the sample gas is equal

to ambient atmospheric pressure.

Before performing the following pressure calibration procedure, disconnect the

sample gas pump and the sample gas-line vent from the sample gas inlet on the

instrument’s rear panel.

To cause the analyzer to measure and record a value for PRES, press.

SAMPLE RANGE = 500.000 PPM CO2 =X.XXX

< TST TST > CAL

SETUP

SETUP X.X

PRIMARY SETUP MENU

CFG DAS

RNGE

PASS CLK

MORE

EXIT

SETUP X.X

SECONDARY SETUP MENU

COMM VARS

DIAG

ALRM

EXIT

Adjust these values until the

displayed pressure equals the

pressure measured by the

independent pressure meter.

DIAG

SIGNAL I / O

NEXT

ENTR

EXIT

Exit at

any time
to return

to main

the

SETUP

SETUP X.X

ENTER DIAG PASS: 818

8 1 8

ENTR

EXIT

Repeat Pressing NEXT until . .

DIAG PCAL

ACTUAL PRESS : 27.20 IN-HG-A

2 7 .2 0 ENTR EXIT

ENTR accepts the

new value and

returns to the

previous menu

EXIT

ignores the

new value and

returns to the

previous menu