Bacharach Portable Combustion Analyzer, Instruction, Page: 58 / 91

Calibration PCA
7. Turn off the flow of CO calibration-gas; then remove the calibration-
gas cylinder from the calibration fixture.
8. Attach a CO/H
2
calibration-gas cylinder to the calibration fixture;
then adjust the regulator of the calibration fixture for a flowmeter
reading of approximately 2 SCFH.
9. Use the
st
and
ENTER
keys to enter a CO-VALUE that is the same as
the CO concentration which is stamped on the CO/H
2
calibration-gas
cylinder.
Typical Test Gas CO/H2 Screen During Calibration Procedure:
TEST GAS CO/H2
-------------------
CO-VALUE XXXX
ENTER CO-VALUE
10. Press the
RUN
key to save the CO-VALUE and display the Calibrate
H2 Screen.
11. After calibration gas has been applied for approximately 3 minutes
(to allow for stabilization), use the
st
and
ENTER
keys to enter an
APPLIED value* that equals the H
2
concentration which is stamped
on the CO/H
2
calibration-gas cylinder.
Typical CALIBRATE H2 Screen During Calibration Procedure:
CALIBRATE H2
MEASURED 1050 PPM
APPLIED 1000 PPM
12. Press the
RUN
key to calibrate the analyzer’s MEASURED value to that
of the APPLIED value. At this time the Calibrate Menu Screen is
redisplayed.
* The H
2
calibration range is 500–1500 ppm, any attempt to calibrate
outside this range will cause the unit to display the message BAD
CALIBRATION ENTRY.
5-10 Instruction 0024-9219