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MODEL 5081-A
SECTION 10.0
CALIBRATION - FREE CHLORINE
10.4 PROCEDURE — FULL SCALE CALIBRATION USING THE REMOTE CONTROLLER
1. Place the sensor in the process liquid. If automatic pH correction is being used, calibrate the pH sensor (see
Section 13.0) 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 7.8). 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 control range. Wait until the reading is
stable before starting the calibration.
3. Press CAL on the remote controller.
4. Press NEXt. the
SEnSor CAL
submenu appears.
5. Press ENtER. the
tiME dELAy
message appears and remains until
the sensor reading meets the stability criteria set in Section 7.6. to
bypass the time delay, press ENtER.
NOTE
As soon as the stability criteria are met (or ENtER is
pressed to bypass the time delay), the transmitter stores
the sensor current. therefore, if the chlorine level in the
process liquid drifts while the sample is being tested, there
is no need to compensate for the change when entering
test results in step 7.
6. the
GrAb SPL
(grab sample) prompt appears. take a sample of the
process liquid and immediately determine the concentration of free
chlorine in the sample. Press ENtER.
7. use the arrow keys to change the flashing display to the concentration
of chlorine determined in the grab sample. Press ENtER to save.
8. Press RESEt to return to the main display.
9. during calibration, the transmitter calculates the sensitivity (nA/ppm) of
the sensor. to check the sensitivity, go to the main display. Press dIAG.
Press NEXt until the
SenSitvty
(sensitivity) prompt appears. Press
ENtER to display the sensitivity in nA/ppm. the sensitivity of a
499ACL-01 sensor is 250 - 350 nA/ppm at 25°C and pH 7.
CALIBRAtE
Grab spl
EXIt
ENtER
CALIBRAtE
Sensor Cal
EXIt
NEXt ENtER
CALIBRAtE
time delay
EXIt
NEXt
CALIBRAtE
Cal
EXIt
ENtER
3
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