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OPERATIONAL GUIDE
ORP Calibration
If both pH and ORP calibrations are required, calibrate the pH value first. A pH calibration can give inaccurate readings if the
probe was used in ORP standard first.
Preparation
Pour small quantities of the ORP standard into clean beakers. If possible, use plastic beakers to minimize any EMC interferences.
For accurate calibration and to minimize cross-contamination, use two beakers; one for rinsing the electrode and one for
calibration.
Use the keys to set the value. Wait for “Stable” message to be displayed and press CFM to confirm calibration.
To clear a previous calibration, press CLR key. Press YES to confirm or NO to exit and return in the calibration screen.
A confirmation message is displayed next.
After pressing CFM in calibration, “DONE” message is displayed.
Rinse the probe in a running stream of water to remove ORP standard before placing it into the saddle or flow cell. It may take
several minutes to equilibrate in the pool water after exposure to the ORP standard.
GLP
Good Laboratory Practice (GLP) refers to a quality control function used to ensure uniformity of probe calibrations and
measurements. To enter GLP information, press MENU key, select pH options or ORP options using the keys and
press GLP.
If no calibration was made or the calibration was cleared, the controller displays the “No calibration available” message.
GLP information for pH and ORP is displayed separately.
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