0024-9551
Revision 1
56
PCA
®
400 User Manual
IMPORTANT
:
“Measured”
is the current SO
2
reading, while
“Applied”
refers to the
known SO
2
level which will be applied to the sensor for calibration purposes.
IMPORTANT
:
If the sensor’s output is low, but still usable, the message
“Good
Calibration WARNING Low Sensor”
will appear. The sensor will now be marked as being
“Low”
in the DIAGNOSTICS screen.
IMPORTANT
:
If the sensor’s output is too low to be usable, the message
“Bad
Calibration Sensor End of Life”
will appear.
CAUTION
:
Unless instructed by the manufacturer or an authorized service provider,
DO NOT reset sensor gain ( ) during the calibration process.
11. Remove Calibration Cylinder
Turn OFF regulator and remove the 1,000 ppm CO and 1,000 ppm H
2
cylinder.
5.6.3 SO
2
Sensor Calibration
Materials / Equipment Required
Before manually calibrating the SO
2
sensor, obtain the following items:
Calibration Kit
(P/N: 0024-7059)
Gas Cylinder
(100 ppm SO
2
in Nitrogen, P/N: 0024-1158)
1. Access the SO
2
Calibration Menu
f
To access the SO
2
Calibration Menu:
Calibration Menu
SO
2
2. Apply 100 ppm SO
2
to the Sensor
Attach a 100 ppm SO
2
cylinder to the regulator.
(For more information about the Gas Sensor
Calibration Equipment, see Figure 5-7.)
3. Adjust Flow Rate
Adjust the regulator to ensure that the flow rate is sufficient enough to calibrate the sensor.
(For more information about adjusting the flow rate, see Figure 5-8.)
4. Enter Applied Value
Using the touch interface or keypad buttons, enter an applied value which exactly equals
the concentration stamped on the SO
2
cylinder.
10. Allow Reading to Stabilize
Wait until the measured reading stabilizes
(approximately 3 minutes)
, and press Save ( ) to calibrate
the H
2
measured value to that of the applied value. The message “Good Calibration” should
briefly appear followed by the CALIBRATION LIST screen.
