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Basic Operation Model GFC7001E Carbon Dioxide Analyzer
Teledyne Analytical Instruments 89
To view and clear warning messages:
Figure 6-3: Viewing and Clearing GFC 7001E/EM WARNING Messages
6.4. CALIBRATION MODE
Press the CAL key to switch the GFC 7001E/EM into calibration mode. In this mode the user can, in conjunction
with introducing zero or span gases of known concentrations into the analyzer, cause it to adjust and recalculate
the slope (gain) and offset of the its measurement range. This mode is also used to check the current calibration
status of the instrument.
For more information about setting up and performing standard calibration operations or checks, see
Section 9.
For more information about setting up and performing EPA equivalent calibrations, see Section 10.
If the instrument includes one of the available zero/span valve options, the SAMPLE mode display will also
include CALZ and CALS keys. Pressing either of these keys also puts the instrument into calibration mode.
The CALZ key is used to initiate a calibration of the analyzer’s zero point using internally generated zero air.
The CALS key is used to calibrate the span point of the analyzer’s current reporting range using span gas.
For more information concerning calibration valve options, see Section 5.6
For information on using the automatic calibration feature (ACAL) in conjunction with the one of the calibration
valve options, see Section 9.4.
NOTE
It is recommended that this span calibration be performed at 80-90% of full scale of the analyzer’s
currently selected reporting range.
EXAMPLES:
If the reporting range is set for 0 to 50 ppm, an appropriate span point would be 40-45 ppm.
If the of the reporting range is set for 0 to 1000 ppb, an appropriate span point would be 800-900 ppb.