Procedure - Manual Calibration Using Deltav - Emerson ROSEMOUNT 5081-A Instruction Manual

MODEL 5081-A
13.5 PROCEDURE — MANUAL CALIBRATION USING Deltav
1. Verify that manual calibration has been enabled. See Section 7.8.
2. obtain two buffer solutions. Ideally, the buffer pH values should bracket the range of pH values to be meas-
ured. Also obtain a reliable thermometer.
3. Remove the sensor from the process liquid. If the temperature of the process and buffer are appreciably dif-
ferent, place the sensor in a container of tap water at the buffer temperature. do not start the calibration until
the sensor has reached the buffer temperature. thirty minutes is usually adequate.
4. Access: deltaV Explorer/Context Menu
pH Buffer Calibration (method_ph_buffer_cal)
For manual buffer calibration to occur, the parameter Buffer Standard
(BuFFER_StANdARd) must be set to "manual".
Method Steps:
a. Prompt: Place sensor in buffer 1.
b. displayed: Current pH Measurement
Current temperature Measurement
Prompt: Are values stable?: Yes; No; Abort
Selecting "No" will cause the measurements to be re-read.
c. If "yes" is chosen:
displayed: Current pH Measurement
Current temperature Measurement
Prompt: Enter buffer 1 value.
d. Prompt: Place sensor in buffer 2.
e. displayed: Current pH Measurement
Current temperature Measurement
Prompt: Are values stable?: Yes; No; Abort
Selecting "No" will cause the measurements to be re-read.
f. If "yes" is chosen:
displayed: Current pH Measurement
Current temperature Measurement
Prompt: Enter buffer 2 value.
g. If there are calibration errors, they will be displayed, and the corresponding errors will be shown in
deltaV Explorer/Status/Errors tab.
h. displayed: Current pH Measurement
Current temperature Measurement
New pH Slope Value
New pH Zero offset Value
the method concludes.
90
NOTE
SECTION 13.0
CALIBRATION - pH