5.2.2 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 pure 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 pure 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 pure water, then submerge it in the soaking solution for 6 hours.
6 CONDUCTIVITY MEASUREMENT
Information regarding the Conductivity Electrode
6.1.1. Conductivity electrode
Model 2301T-S plastic conductivity electrode with constant K=1.0 and built-in temperature sensor, can realize
automatic temperature compensation. The electrode housing is POM plastic which is corrosion resistant and
impact resistant. When submerge the conductivity electrode in solution, stir the solution briefly to eliminate the
air bubbles and improve response and stability.
6.1.2. Conductivity electrode constant
The meter matches conductivity electrodes of three constants: K=0.1, K=1.0 and K=10.0. Please refer to chart-
6 for measuring range. Set constant in parameter setting P2.1 and refer to clause 7.4
Chart – 6 Electrode constant and measuring range
Note: When testing ultra-pure water with conductivity less than 1.0 μS/cm, a flow test should be conducted in a flow
cell.
6.1.3 When connecting the electrode, please rotate slowly to identify the location of the mount before plugging in.
The nut on the connector should be screwed on tightly. Once the conductivity electrode is connected, the meter will
automatically switch to conductivity mode (no need to switch manually). Please do not pull the cable in case of poor
contact. Make sure the connector is clean and dry. See more information regarding the conductivity electrode’s
maintenance in section 6.6.
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