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M400E Ozone Analyzer Operator’s Manual M400E Calibration Procedures
04315 Rev. C1 159
9.3.2. MANUAL CALIBRATION USING VALVE OPTIONS
NOTE
While the internal Zero Span Option is a convenient tool for performing Calibration Checks, its O
3
generator is not stable enough to be used as a source of Zero Air or Span Gas for calibrating the
instrument.
Calibrations should ONLY be performed using external sources of Zero Air and Span Gas whose
accuracy is traceable to EPA or NIST standards.
On instruments with Z/S valve options, zero air and span gas is supplied to the analyzer through the zero gas
and span gas inlets (see
Enclosure Wall
Figure 9-2 and the zero and cal operations are initiated dire
ctly and independently with dedicated keys (CALZ &
CALS
).