Instruction manual

MODEL XMT-A-FF/FI SECTION 10.0

CALIBRATION - FREE CHLORINE

10.3 PROCEDURE — FULL SCALE CALIBRATION

1. Place the sensor in the process liquid. If automatic pH correction is being used, calibrate the pH sensor (see

Section 14) and place it in the process liquid. If manual pH correction is being used, measure the pH of the

process liquid and enter the value (see Section 7.4). Adjust the sample flow until it is within the range recom-

mended for the chlorine sensor. Refer to the sensor instruction sheet.

2. Adjust the chlorine concentration until it is near the upper end of the operating range. Wait until the transmit-

ter reading is stable before starting the calibration.

3. Press MENU. The main menu screen appears. Choose Calibrate.

4. Choose Chlorine.

5. Choose InProcess.

6. The screen at left appears for two seconds.

7. The screen at left appears. The number in the first line is the concen-

tration of chlorine based on the previous calibration. Wait until the read-

ing is stable, then press ENTER.

8. The screen at left appears. Take a grab sample of the process liquid

and immediately press ENTER. The transmitter will store the present

sensor current and temperature and use those values in the calibration.

9. Immediately determine the free chlorine concentration in the sample.

10. Use the arrow keys to change the value in the second line to match the

results of the laboratory test. To return to the main display press MENU

then EXIT.

11. This screen appears momentarily if the sensitivity (sensor current divid-

ed by concentration) is much higher or lower than expected. The dis-

play then returns to the screen in step 5. See Section 15 for trou-

bleshooting.

Cal? pH

Chlorine

Temp

Calibrate

Sim. PV

Program Display

Cal?

InProcess

Zero

Wait for

Stable reading.

Stable? 1.00ppm

Press enter.

Take sample;

Press enter.

Sample 1.00ppm

Cal

.00ppm

Calibration

Error