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Instruction 24-94485-8
Calibration
5.6 CO-LO Sensor Calibration
Note that the CO-LO sensor also measures H
2
for the purpose of com-
pensating the CO reading for the presence of H
2
in the gas sample. This
procedure first spans the CO-LO sensor and, optionally, spans the H
2
part
of the sensor to known gas levels.
Material Required:
Calibration Kit, P/N 24-7059
Gas Cylinder: 500 ppm CO in air, P/N 24-0492
Gas Cylinder: 1,000 ppm CO & 1,000 ppm H
2
in Nitrogen, P/N 24-0794
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 CO-LO, and
then press ENT to display the CALIBRATE
CO screen.
“Measured” is the current CO reading, while
“Applied” is a known CO level that will be
applied for calibration purposes.
3. Attach a 500 ppm CO 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 CO cylinder.
The calibration range is from 250 to
1,000 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 the regulator for a flowmeter indica-
tion of approximately 2 SCFH. Wait until
the Measured reading stabilizes (approximately 3 minutes), and then
press ENT to calibrate the CO Measured value to that of the Applied
value. The message “Good Calibration” should briefly appear followed
by the TEST GAS CO/H
2
screen.
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 CO
Measured 480 PPM
Applied 500 PPM
06/27/06 11:55:30 PM
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F1 F2 F3