155 Measuring with Optical Dissolved Oxygen (DO) Probes
11. When the reading is stable CFM is displayed. Press CFM to save.
“Wait” is displayed at the bottom of the LCD until the calibration is saved.
“Calibration DONE” message is displayed and the controller returns to the menu.
24.5.2. Process Calibration
Prior to performing a process calibration, a reference meter and probe must be used (or another method) to
determine the DO value of the process.
Preparation
• Determine the process DO value, using a calibrated reference meter and probe.
•
The process controller and the probe should have previously been calibrated with two standards (probe
slope determined).
Procedure
1. Press CAL to enter calibration mode.
At prompt, with the password enabled, input the passcode.
2. Press Process to enter process calibration.
3. Use the
ud keys to adjust the process value in agreement with the predetermined value.
4. When the reading is stable, CFM is displayed. Press CFM to save the calibration.
“Wait” is displayed at the bottom of the LCD until the calibration is saved.
“DONE” message is displayed and the controller returns to the menu.
Note: Process calibration evaluates probe offset if input is reading is less than 20 %, or probe slope if values
are over 20 %.
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