Teledyne GFC-7000T - Trace CO2 Analyzer - manual - Manual (Page 183)

Calibration Procedures Model GFC7000TA Carbon Dioxide Analyzer
Teledyne Analytical Instruments 165
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.
ACTION:
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 ppm.
This may take
several minutes.
The value of
STABIL may jump
significantly.
Wait until it falls
below 1.0 ppm. 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 SPAN and ZERO buttons.
SAMPLE RANGE = 500.0 PPM CO2=X.XXX
< TST TST > CAL SETUP
Scroll the display to the
STABIL test function.
ACTION:
Supply the instrument with zero gas.