Teledyne gfc 7000ta operation manual Pressure Calibration, Repeat Pressing Next until

Operating Instructions Model GFC7000TA Carbon Dioxide Analyzer

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 CO2 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

Exit at

any time to return to main the

SETUP

menu

SETUP X.X ENTER DIAG PASS: 818

8 1 8	ENTR EXIT
DIAG	SIGNAL I / O
NEXT	ENTR	EXIT

Repeat Pressing NEXT until . . .

DIAG PCAL ACTUAL PRESS : 27.20 IN-HG-A

2 7 .2 0 ENTR EXIT

Adjust these values until the displayed pressure equals the pressure measured by the independent pressure meter.

ENTR accepts the

new value and returns to the previous menu EXIT ignores the new value and

returns to the

previous menu

Teledyne Analytical Instruments 138