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M400E Ozone Analyzer Operator’s Manual Basic Operation of the M400E Analyzer
6.3. CALIBRATION MODE
In this mode the user can, in conjunction with introducing of 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
Chapter 9.
For more information about setting up and performing EPAPressing the CAL key, switches the M400E
into calibration mode.
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 internally
generated O
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span gas.
For more information concerning calibration valve options, see Section 5.6.
For information on using the automatic calibrations feature (ACAL) in conjunction with the one of the
calibration valve options, see Sections 9.3.2 and 9.4.
NOTE
It is recommended that this span calibration be performed at 80% of full scale of the analyzer’s currently
selected reporting range.
EXAMPLES:
If the reporting range is set for 0 to 500 ppb, an appropriate span point would be 400 ppb.
If the of the reporting range is set for 0 to 1000 ppb, an appropriate span point would be 800 ppb.
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