Bacharach PCA 400 - CO HIGH Sensor Calibration

0024-9551 Revision 1
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PCA
®
400 User Manual
IMPORTANT: The calibration range is from 100 to 5,000 ppm. An attempt to
calibrate outside of this range will cause the message “Applied Value High” or “Applied
Value Low” appear at the bottom of the screen.
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.
IMPORTANT: “Measured” is the current CO reading, while “Applied” refers to the
known CO level which will be applied to the sensor for calibration purposes.
5. Allow Reading to Stabilize
Wait until the measured reading stabilizes (approximately 3 minutes), and press Save ( ) to calibrate
the CO Measured value to that of the applied value. The message “Good Calibration” should
briefly appear followed by the CALIBRATION LIST screen.
2. Apply 500 ppm CO to the Sensor
Attach a 500 ppm CO 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 ow 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 CO cylinder.
5.6.6 CO
HIGH
Sensor Calibration
Materials / Equipment Required
Before manually calibrating the CO
HIGH
sensor, obtain the following items:

 Calibration Kit (P/N: 0024-7059)

 Gas Cylinder (500 ppm CO in Air, P/N: 0024-0492)
1. Access the CO Calibration Menu
f To access the CO
HIGH
Calibration Menu: Calibration Menu  CO
CAUTION: Unless instructed by the manufacturer or an authorized service provider,
DO NOT reset sensor gain ( ) during the calibration process.