Advanced Instruments Inc.
8.
From the SPAN menu advance the cursor to Calibrate and press ENTER to select.
9.
Follow the menus below to enter and accept the 20.9% span value.
10.
The analyzer returns to the SAMPLE mode after accepting calibration.
11.
Replace the sensor in the housing – tighten the clamp by turning the bolt (finger tight plus 3/4) turn.
12.
Close the door of the enclosure, ensure that the gasket is in place to maintain NEMA 4 rating and lock the door by
using (4) screws.
13.
Proceed to sampling.
Span Gas Calibration
This procedure assumes a span gas under positive pressure and is recommended for a transmitter without an optional
sampling pump, which if installed downstream of the sensor should be placed in the OFF position and disconnected so
the vent is not restricted during calibration.
To assure an accurate calibration, the temperature and pressure of the span gas must closely approximate the sample
conditions.
For calibration purposes, use of the AUTO SAMPLE mode is recommended.
1.
Access the MAIN MENU by pressing the MENU key.
2.
Advance the reverse shade cursor using the ARROW keys to highlight AUTO SAMPLE.
3.
Press the ENTER key to select the highlighted menu option.
The following displays appear:
MAIN MENU
AUTO SAMPLE
MANUAL SAMPLE
CALIBRATION
0.3 PPM
AUTO SAMPLING
10 PPM RANGE
76 F 100 KPA
4.
Return to the MAIN MENU by pressing the MENU key.
5.
Advance the reverse shade cursor using the ARROW keys to highlight CALIBRATION.
6.
Press the ENTER key to select the highlighted menu option.
7.
Repeat to select SPAN CALIBRATE
The following displays appear:
MAIN MENU
AUTO SAMPLE
MANUAL SAMPLE
CALIBRATION
>>>
CALIBRATION
SPAN CALIBRATE
ZERO CALIBRATE
DEFAULT SPAN
DEFAULT ZERO
OUTPUT SPAN
OUTPUT ZERO
8.
After selecting the SPAN CALIBRATION, enter appropriate span gas value.
9.
Assure there are no restrictions in vent line.
10.
Regulate the Span gas pressure, as described above at 5-30 psig, and set gas flow 1-2 SCFH flow rate.
11.
If the span gas line is not already connected, connect the span gas to the sample inlet or span inlet (if equipped
with a separate span inlet).
After selecting the span menu, the following display appears:
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