5-8 | Model 931S / Model 932S UV Analyzers
2. Spanning the sensor(s):
Your analyzer may use any combination of one to three sensors,
whose information may be displayed on Sensor1, Sensor2, and/or
Sensor3 screens, depending on the sensors being used. Use the infor-
mation as it applies to your application.
a. Span the first (or only) sensor:
Connect the Span gas cylinder (for the species being measured by
Sensor1, for example) to the analyzer.
From Sensor screen (1, 2, or 3), enter the Span gas value (of the
Span gas being used) in the Span Concentration field.
Record the Interference Gas values (#1 and #2) and then adjust
them as necessary, if they are non-zero values. Click Apply.
Change Flow Control to ‘5’ (sample mode).
Adjust the Span Gas regulator to the recommended pressure listed
on the Final “As-Built” drawings.
View the readings from the Sensors screen. After they have sta-
bilized, click the ManSpan button under Span-Cal. Confirm the
Span Factor reading (on Sensor screen) has been updated.
Change Flow Control to ‘4’ (shut in/shut off).
Bleed down the Span gas and disconnect it from the analyzer.
If there are other sensors to span, continue with Step 2-b. If not,
continue with Step 3.
b. Span the second sensor (if used):
Connect the Span gas cylinder (for the species being measured by
Sensor2, for example) to the analyzer.
Span the analyzer, as described in Step 2-a, then bleed down the
Span gas and disconnect it from the analyzer.
If there is another sensor to span, continue with Step 2-c. If not,
continue with Step 3.
Setup (tab)Gas
Calibration
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