7.4.1 Preparation Appendix D – ACCESSORIES lists Hanna solutions used for ORP calibrations. The calibration should be conducted at temperatures between 20-26°C. The sensor should be clean and oil free.
7.4.2 Procedure • From the “Calibration” menu select “Single
param. calibration” and then “ORP calibration”. The display shows two options: “Custom ORP” and “Restore factory calib.”.
• For a user calibration select “Custom ORP”. • Fill a beaker with an ORP test solution (see
APPENDIX D “Accessories”).
• Using the keypad, insert the numerical ORP
value and then press to confirm.
• The stability counter will count down and the
message “Ready” and will be displayed.
• Press to accept the calibration
point.
• After confirmation, the following messages are displayed: “Storing” and
“Calibration completed”.
• Press OK to return to the Calibration menu. • Press to return to the measurement screen. • To restore the factory calibration data, select the corresponding option in the
