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Instruction 24-9448 5-11
Calibration
If the sensor’s output is too low to be usable, then the message “Bad
Calibration Sensor End of Life, Entry Not Saved” will appear followed
by the CALIBRATION LIST screen being re-displayed. The sensor will
now be marked as being BAD in the DIAGNOSTICS screen.
6. Turn OFF regulator and remove gas cylinder.
5.8 NO Sensor Calibration
This procedure spans the optional nitric oxide sensor to a known gas level.
Material Required:
Calibration Kit, P/N 24-7059
Gas Cylinder: 250 ppm NO in Nitrogen, P/N 24-1156
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 NO, and
then press ENT to display the CALIBRATE
NO screen.
“Measured” is the current NO reading, while
“Applied” is a known NO level that will be
applied for calibration purposes.
3. Attach a 250 ppm NO 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 NO cylinder.
The calibration range is from 9 to 550 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 NO Measured value
to that of the Applied value. The message “Good Calibration” should
•
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CALIBRATION LIST
Pressure
T-Stack
T-Air
CO-LO
SO2
NO
NO2
(more)
MENU
F1 F2 F3
CALIBRATE NO
Measured 245 PPM
Applied 250 PPM
06/28/06 11:45:30 PM
PRINT
F1 F2 F3