Bacharach PCA 2 24-9448 - Manual (Page 74)

Instruction 24-9448 5-8
Calibration
5.6 CO-LO Sensor Calibration
Note that the CO-LO sensor also measures H
2
for the purpose of com-
pensatng the CO readng for the presence of H
2
n the gas sample. Ths
procedure frst spans the CO-LO sensor and, optonally, spans the H
2
part
of the sensor to known gas levels.
Material Required:
Calbraton Kt, P/N 24-7059
Gas Cylnder: 500 ppm CO n ar, P/N 24-0492
Gas Cylnder: 1,000 ppm CO & 1,000 ppm H
2
n Ntrogen, P/N 24-0794
Procedure:
1. If not already done, turn ON the analyzer and dsplay the
CALIBRATION LIST screen per Secton 5.2.
2. Use the buttons to hghlght CO-LO, and
then press ENT to dsplay the CALIBRATE
CO screen.
“Measured” is the current CO reading, while
“Applied” is a known CO level that will be
applied for calibration purposes.
3. Attach a 500 ppm CO cylnder to the regu-
lator of the calbraton fxture shown n
Fgure 5-2 on Page 5-14.
4. Use the and buttons to enter an
Appled value that exactly equals the concen-
traton stamped on the CO cylnder.
The calibration range is from 250 to
1,000 ppm. An attempt to calibrate outside
this range will cause the message “Bad
Calibration Wrong CAL Entry” to appear in
the following step.
5. Adjust the regulator for a flowmeter ndca-
ton of approxmately 2 SCFH. Wat untl
the Measured readng stablzes (approxmately 3 mnutes), and then
press ENT to calbrate the CO Measured value to that of the Appled
value. The message “Good Calbraton” should brefly 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.
•
•
•
CALIBRATION LIST
Pressure
T-Stack
T-Air
CO-LO
SO
2
NO
NO
2
(more)
MENU
F1 F2 F3
CALIBRATE CO
Measured 480 PPM
Applied 500 PPM
06/27/06 11:55:30 PM
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F1 F2 F3