Procedure - Zeroing The Sensor Using Deltav; Procedure - Full Scale Calibration Using The Infrared Remote Controller - Emerson ROSEMOUNT 5081-A Instruction Manual

MODEL 5081-A
12.3 PROCEDURE — zEROING THE SENSOR USING Deltav
1. Place the sensor in the zero standard (see Section 12.1). Be sure no air bubbles are trapped against the mem-
brane. the sensor current will drop rapidly at first and then gradually reach a stable zero value. to monitor the
sensor current, go to the main display. Press dIAG followed by NEXt. the SEnSor Cur prompt appears. Press
ENtER to view the sensor current. Note the units: nA is nanoamps; µA is microamps. typical zero current for
an ozone sensor is -10 to +10 nanoamps.
A new sensor or a sensor in which the electrolyte solution has been replace may require several hours (occa-
sionally as long as overnight) to reach a minimum zero current. do Not StARt tHE ZERo RoutINE uNtIL
tHE SENSoR HAS BEEN IN ZERo SoLutIoN FoR At LEASt tWo HouRS.
2. Access: deltaV Explorer/Context Menu
Zero Amperometric Sensor (method_sensor_zero)
Method Steps:
a. displayed: Current ozone Measurement
Prompt: Is PV less than limit?: Yes; No; Abort
Selecting "Yes" to a ozone measurement greater than the zero limit will cause
the measurement to be accepted as the zero value. Selecting "No" will cause
the ozone measurement to be re-read. the new ozone measurement may be
closer to the zero limit. If the ozone measurement is significantly greater than
the zero limit, the method should be aborted ("Abort") and restarted after suffi-
cient time for the ozone reading to approach the zero limit.
b. If "Yes" is chosen, the Current ozone Reading and the new Zero Current Value are displayed.
the method then concludes.
12.4 PROCEDURE — FULL SCALE CALIBRATION USING THE REMOTE CONTROLLER
1. Place the sensor in the process liquid. Adjust the sample flow until it is within the range recommended for the
sensor. Refer to the sensor instruction sheet.
2. Adjust the ozone concentration until it is near the upper end of the control range. Wait until the reading is sta-
ble before starting the calibration.
CALIBRAtE
Sensor Cal
EXIt NEXt
CALIBRAtE
time delay
EXIt NEXt
84
Zero limit
3. Press CAL on the infrared remote controller.
4. Press NEXt. the SEnSor CAL submenu appears.
ENtER
5. Press NEXt. the tiME dELAy message appears and remains until the
NOTE
sensor reading meets the stability criteria set in Section 7.6. 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.
CALIBRATION - OzONE
NOTE
SECTION 12.0