Bacharach PCA 2 24-9448 - Manual (Page 77)

Instruction 24-9448 5-11
Calibration
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 followed
by the CALIBRATION LIST screen being re-displayed. The sensor will
now be marked as being BAD in the DIAGNOSTICS screen.
6. Turn OFF regulator and remove gas cylnder.
5.8 NO Sensor Calibration
Ths procedure spans the optonal ntrc oxde sensor to a known gas level.
Material Required:
Calbraton Kt, P/N 24-7059
Gas Cylnder: 250 ppm NO n Ntrogen, P/N 24-1156
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 NO, and
then press ENT to dsplay the CALIBRATE
NO screen.
“Measured” is the current NO reading, while
“Applied” is a known NO level that will be
applied for calibration purposes.
3. Attach a 250 ppm NO 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 NO cylnder.
The calibration range is from 9 to 550 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 NO Measured value
to that of the Appled value. The message “Good Calbraton” should
•
•
CALIBRATION LIST
Pressure
T-Stack
T-Air
CO-LO
SO
2
NO
NO
2
(more)
MENU
F1 F2 F3
CALIBRATE NO
Measured 245 PPM
Applied 250 PPM
06/28/06 11:45:30 PM
PRINT
F1 F2 F3