Specifications

PCA
®
3
78
5. Adjust the regulator for a fl owmeter indication of approximately
2 SCFH. Wait until the Measured reading stabilizes (approximate-
ly 3 minutes), and then press ENT to calibrate the CO Measured
value to that of the Applied value. The message “Good Calibration”
should briefl y 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.
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. The sensor will now be marked as
being BAD in the DIAGNOSTICS screen.
6. Turn OFF the regulator of
calibration fi xture and remove the
CO cylinder.
7. Attach a combination 1,000 ppm CO
and 1,000 ppm H
2
cylinder to the
regulator of the calibration fi xture,
and then use the ▲▼ and ◄►
buttons to enter an Applied value
that exactly equals the CO concen-
tration stamped on the cylinder.
8. Adjust the regulator for a fl owmeter
indication of approximately 2 SCFH,
and then press ENT to display the
CALIBRATE H
2
screen.
The calibration range is from 400 to
1,500 ppm. Calibrating outside this
range will cause the message “Bad
Calibration Wrong CAL Entry” to
appear in the following step.
9. Wait until the Measured reading stabilizes (approximately
3 minutes), and then press ENT to calibrate the H
2
Measured
value to that of the Applied value; after which the message “Good
Calibration” should briefl y appear followed by the CALIBRATION
LIST screen being re-displayed.
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.