Instruction Manual

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6 mV and ORP Measurement
6.1 Sample Test
6.1.1. Press < > to turn on the meter, press < MODE > to switch to , then press
< UNIT > key to choose or ;
(a) — This is the electrode potential measuring mode. mV value and the
temperature will be displayed at the same time;
(b)
— This is the ORP (redox) measurement mode. ORP measurement has no
temperature compensation, so there is no temperature appears in this mode;
Note: ORP is the abbreviation of “Oxidation-Reduction Potential”, representing the
Oxidation-Reduction Potential of the solution, ORP is the measuring parameter for the
oxidation reduction potential of the aqueous solution. Use mV as its unit.
6.1.2. Connect ORP electrode (sold separately) or ion electrode, immerge it into the sample
solution, stir briefly and then set it still. When smiling icon appears and stays, the
reading is the ORP value or the potential value of the ion electrode.
6.2 Notes
6.2.1. ORP measurement does not require calibration. When the user is not sure about ORP
electrode quality or measuring value, use ORP standard solution to test mV value and see
whether ORP electrode or meter works properly.
6.2.2. Clean and activate ORP electrode: After the electrode has been used over a long
period of time, the platinum surface will get polluted which causes inaccurate measurement
and slow response. Please refer to the following methods to clean and activate ORP
electrode:
(a) For inorganic pollutant, submerge the electrode in 0.1mol/L dilute hydrochloric acid for
30 minutes, then wash it in distilled water, then submerge it in the soaking solution for 6
hours.
(b) For organic or lipid pollutant, clean the platinum surface with detergent, then wash it in
distilled water, then submerge it in the soaking solution for 6 hours.
(c) For heavily polluted platinum surface on which there is oxidation film, polish the platinum
surface with toothpaste, then wash it in distilled water, then submerge it in the soaking
solution for 6 hours.
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