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Model GFC7000E Instruction Manual Calibration Procedures
04584 Rev A1 133
7.3. Manual Calibration Checks
Informal calibration checks, which only evaluate but do not alter the analyzer’s response curve,
are recommended as a regular maintenance item and in order to monitor the analyzer’s
performance. To carry out a calibration check rather than a full calibration, follow these steps.
STEP ONE: Connect the sources of zero air and span gas as shown in Figures 7.1 or 7.2.
STEP TWO: Perform the zero/span calibration check procedure:
SAMPLE STABIL=XXX.X PPM
CO2=X.XXX
< TST TST > CAL SETUP
ACTION:
Record the CO
2
concentration
reading.
A
CTION:
Supply span gas to the instrument
SAMPLE STABIL=XXX.X PPM CO2=X.XXX
< TST TST > CAL SETUP
ACTION:
Record the CO
2
concentration
reading.
Wait until
STABIL
is
below 1.0 ppb.
This may take
several minutes.
The value of
STABIL may jump
significantly.
Wait until it falls
below 1.0 ppb. This
may take several
minutes.
SAMPLE
STABIL=XXX.X PPM
CO2=X.XXX
< TST TST > CAL SETUP
The SPAN key appears during the transition from zero to
span. You may see both keys.
SAMPLE RANGE = 500.0 PPM CO2=X.XXX
< TST TST > CAL SETUP
Scroll the display to the
STABIL test function.
A
CTION:
Supply the instrument with zero gas.
7.4. Manual Calibration with Zero/Span Valves
There are four different zero/span valve option configurations (see Section 5.4). They all operate
identically, differing only in the method used to supply calibration gas to the Analyzer.
STEP ONE
: Connect the sources of Zero Air and Span Gas as shown below.
Figures 7-3 through 7-6 show the proper pneumatic connections for GFC7000E’s with various
optional internal valve sets installed.