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MODEL 5081-A
SECTION 11.0
CALIBRATION - TOTAL CHLORINE
11.4 PROCEDURE — FULL SCALE CALIBRATION USING THE REMOTE CONTROLLER
1. If the sensor was just zeroed, place the reagent uptake tube back in the bottle. once the flow of reagent starts,
it takes about one minute for the sensor current to begin to increase. It may take an hour or longer for the read-
ing to stabilize. Be sure the sample flow stays between 80 and 100 mL/min and the pressure is between 3 and
5 psig.
2. Adjust the chlorine concentration until it is near the upper end of the control range. Wait until the controller
reading is stable before starting the calibration.
3. Press CAL on the remote controller.
4. Press NEXt. the
SEnSor CAL
submenu appears.
5. Press NEXt. 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 total
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-02 sensor is about 1300 nA/ppm at 25°C.
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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