Calibration | 5-5
f. Allow the sample system pressure to bleed down to atmospheric
pressure (check the pressure gauge). If there is an isolation valve on
the Vent Line, close it (or cap the Vent Line outlet).
If the sample system does not have an isolation valve, Zero gas may
continue to flow. Turn off the Zero gas.
2. From the Gas Calibration dialog box, click AutoZero to perform an
Auto-Zero to automatically adjust the analyzer Zero. The Zero Off-
set is adjusted based on the average reading during the Integration
Timer duration at the end of the Auto Calibration Timers (example,
AZ-0) countdown.
While the Auto-Zero is in progress, observe the Signal Level at Zero-
Cal Reference and Differential values on the Sensors screen. After the
Auto-Zero is complete, record these values. Turn off the Zero gas.
3. Span the analyzer:
a. Remove the Swagelok cap from the Span Gas Connection (Manual
Operation) inlet and connect the span gas cylinder (for the species
being measured).
b. From the Gas Calibration dialog box, enter the span gas value (of
the span gas being used) in the Span Conc field.
Change Flow Control to ‘5’ (sample).
c. Adjust the Span Gas regulator to the recommended pressure listed
on the Final “As-Built” drawings. The pressure must be less than the
1380 kPag (200 psig) maximum Cell Pressure.
d. Observe the readings from the Analyzer Data tab. After they have
stabilized, return to Calibration dialog box and click the ManSpan
button. Confirm the SFactor reading has been updated.
Change Flow Control to ‘4’ (shut in/shut off).
e. Bleed down the span gas and disconnect it from the analyzer.
Setup (tab)Gas
Calibration
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