CALIBRATE SO2
Measured 98 PPM
Applied 100 PPM
06/28/06 11:55:30 PM PRINT

Calibration

5.7 SO2 Sensor Calibration

This procedure spans the optional sulfur dioxide sensor to a known gas level.

Material Required:

• Calibration Kit, P/N 24-7059

• Gas Cylinder: 100 ppm SO2 in Nitrogen, P/N 24-1158

Procedure:

1.If not already done, turn ON the analyzer and display the CALIBRATION LIST screen per Section 5.2.

2.Use the buttons to highlight SO2, and then press ENT to display the CALIBRATE SO2 screen.

“Measured” is the current SO2 reading, while “Applied” is a known SO2 level that will be applied for calibration purposes.

3.Attach a 100 ppm SO2 cylinder to the regu- lator of the calibration fixture shown in Figure 5-2on Page 5-14.

4.Use the and buttons to enter an Applied value that exactly equals the concen- tration stamped on the SO2 cylinder.

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.

CALIBRATION LIST

Pressure

T-Stack

T-Air

CO-LO

SO2

NO

NO2

(more)

MENU

F1 F2 F3

5. Adjust regulator for a flowmeter indication

of approximately 2 SCFH. Wait until the F1 F2 F3 Measured reading stabilizes (approximately

3 minutes), and then press ENT to calibrate the SO2 Measured value to that of the Applied value. The message “Good Calibration” should briefly 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.

5-10

Instruction 24-9448

Page 76
Image 76
Bacharach 24-9448 manual SO2 Sensor Calibration

24-9448 specifications

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