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5
mV measurement
5.1
ORP measurement
Press key, and switch the meter to mV measurement mode. Connect ORP electrode (sold separately)
and dip it in sample solution, stir the solution briefly and allow it to stay in the solution until icon appears
and get the reading which is ORP value.
ORP means Oxidation Reduction Potential. The unit is mV.
5.2
Notes of ORP measurement
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.
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.
6
Parameter Setup
6.1
Main menu
In the measurement mode, press and hold key to enter in mode P1.0, then press
or
to switch
among main menu: P1.0→P2.0→P3.0→P4.0. Please refer to Diagram – 12.
P1.0: pH parameter setup menu,
P4.0: Basic parameter setup menu.
6.2
Submenu
1) In P1.0 mode, press key to enter in submenu P1.1 of pH parameter setup, then press
and key to switch among submenu: P1.1→P1.2→…→P1.6, refer to Diagram – 20.
2) In P4.0 mode, press
key to enter in submenu P4.1 of basic parameter setup, then press
and key to switch among submenu: P4.1→P4.2→…→P4.8, refer to Diagram – 20
