Procedure - Full Scale Calibration - Emerson Rosemount Analytical HART 5081-A-HT Instruction Manual

MODEL 5081-A
11.3 PROCEDURE — FULL SCALE CALIBRATION
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 transmitter
reading is stable before starting the calibration.
CALIBRATE
Sensor Cal
EXIT NEXT ENTER
CALIBRATE
time delay
EXIT NEXT
CALIBRATE
Grab spl
EXIT ENTER
CALIBRATE
Cal
3 . 20
EXIT ENTER
62
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 7.8. To bypass
the time delay, press ENTER.
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.
CALIBRATION - TOTAL CHLORINE
NOTE
SECTION 11.0