Bacharach PCA3 - 6.11. COHIGH Sensor Calibration

PCA

3 Manual
76 0024-9473 Rev 3
6.8. SO
2
Sensor Calibration
This procedure spans the optional sulfur dioxide sensor to a known gas level.
6.8.1. Material Required
•
Calibration Kit ( P/N 0024-7059)
•
Gas Cylinder (100 ppm SO
2
in Nitrogen, P/N 0024-1158)
6.8.2. Procedure
1. If not already done, turn ON the analyzer and display the
CALIBRATION LIST screen (refer to Calibration on page 66).
2. Use the ▲▼ buttons to highlight SO
2
, and then press ENT to display
the CALIBRATE SO
2
screen.
NOTE: “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 regulator of the calibration fixture
shown in Figure 6-12 on page 80.
4. Use the ▲▼ and
◄►
buttons to enter an applied value that exactly
equals the concentration stamped on the SO
2
cylinder.
NOTE: The calibration range is from 9 to 1,800 ppm. An
attempt to calibrate outside this range will cause the
message “Bad Calibration Wrong CAL Entry” to appear in
the following step.
Figure 6-9. SO
2
Sensor Calibration
5. Adjust regulator for a flow meter 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.