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Instruction 24-94485-10
Calibration
5.7 SO
2
Sensor Calibration
This procedure spans the optional sulfur dioxide sensor to a known
gas level.
Material Required:
Calibration Kit, P/N 24-7059
Gas Cylinder: 100 ppm SO
2
in Nitrogen, P/N 24-1158
Procedure:
1. If not already done, turn ON the analyzer and display the
CALIBRATION LIST screen per Section 5.2.
2. Use the buttons to highlight SO
2
, and
then press ENT to display the CALIBRATE
SO
2
screen.
“Measured” is the current SO
2
reading, while
“Applied” is a known SO
2
level that will be
applied for calibration purposes.
3. Attach a 100 ppm SO
2
cylinder to the regu-
lator of the calibration fixture shown in
Figure 5-2 on Page 5-14.
4. Use the and buttons to enter an
Applied value that exactly equals the concen-
tration stamped on the SO
2
cylinder.
The calibration range is from 9 to 150 ppm.
An attempt to calibrate outside this range will
cause the message “Bad Calibration Wrong
CAL Entry” to appear in the following step.
5. Adjust regulator for a flowmeter indication
of approximately 2 SCFH. Wait until the
Measured reading stabilizes (approximately
3 minutes), and then press ENT to calibrate the SO
2
Measured value
to that of the Applied value. The message “Good Calibration” should
briefly appear followed by the CALIBRATION LIST screen being
re-displayed.
If the sensor’s output is low, but still usable, then the message “Good
Calibration WARNING Low Sensor” will appear. The sensor will now
be marked as being Low in the DIAGNOSTICS screen.
•
•
CALIBRATION LIST
Pressure
T-Stack
T-Air
CO-LO
SO2
NO
NO2
(more)
MENU
F1 F2 F3
CALIBRATE SO2
Measured 98 PPM
Applied 100 PPM
06/28/06 11:55:30 PM
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F1 F2 F3