Bacharach PCA 2 24-9448, Operating & Maintenance Instructions

Page: 76 / 108

Instruction 24-9448 5-10
Calibration
5.7 SO
2
Sensor Calibration
Ths procedure spans the optonal sulfur doxde sensor to a known
gas level.
Material Required:
Calbraton Kt, P/N 24-7059
Gas Cylnder: 100 ppm SO
2
n Ntrogen, P/N 24-1158
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 SO
2
, and
then press
ENT
to dsplay the CALIBRATE
SO
2
screen.
“Measured” is the current SO
2
reading, while
“Applied” is a known SO
2
level that will be
applied for calibration purposes.
3. Attach a 100 ppm SO
2
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 SO
2
cylnder.
The calibration range is from 9 to 150 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 regulator for a flowmeter ndcaton
of approxmately 2 SCFH. Wat untl the
Measured readng stablzes (approxmately
3 mnutes), and then press
ENT
to calbrate the SO
2
Measured value
to that of the Appled value. The message “Good Calbraton” should
brefly appear followed by the CALIBRATION LIST screen beng
re-dsplayed.
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 SO
2
Measured 98 PPM
Applied 100 PPM
06/28/06 11:55:30 PM
PRINT
F1 F2 F3