Emerson Rosemount TupHFET TF396, Быстрый старт, Страница: 27 / 36

4.2.2 Recommended pH sensor standardization
For maximum accuracy, you can standardize the sensor online or with a
process grab sample after performing a buffer calibration and conditioning
the sensor to the process. Standardization accounts for the sensor junction
potential and other interferences. Standardization will not change the
sensor's slope, but will simply adjust the transmitter's reading to match that
of the known process pH.
Procedure
1. While obtaining a process solution sample, record the pH value that
is shown on the transmitter display.
Emerson recommends taking the sample close to the sensor.
2. Measure and record the pH of the process solution with another
temperature compensated, calibrated pH instrument.
For best results, perform standardization at the process temperature.
3. Adjust the transmitter value to the standardized value.
4.3 Configure transmitter
Configuration requirements: For proper operation, transmitters capable of
advanced sensor diagnostics must have this feature turned off. (Refer to the
appropriate transmitter's reference manual for complete instructions.
Rosemount
™
54e pH/ORP
Go to
Program
→
Configure
→
Diagnostics
. Edit diagnostics and select Off.
Rosemount 1055
Go to Program
→
Measurement
→
Sensor 1 or Sensor 2
→
pH . At the
screen prompt
Glass Fault Enable?
, select No.
Rosemount 81, 3081, 4081, or 5081
From the Program menu, select dIAG and toggle it to OFF.
March 2020 Quick Start Guide
Quick Start Guide 27