For serious passivation, dip the bulb in 4% HF (hydrofluoric acid) for 3-5 seconds, and wash it in
distilled water, then soak it in the 3M KCL storage solution (SKU: AI1107) for 24 hours to renew it.
4.5.5 Clean contaminated glass bulb and junction (please refer to Table-5)
Table-5 Clean contaminated glass bulb and junction
Notes:
The instruments will NOT give accurate and stable pH readings when measuring distilled or deionized
water. This because distilled and deionized water do not have enough ions present for the electrode to
function properly. To measure distilled or deionized water’s pH, users need to use a specialized electrode.
Contact us for more details.
The electrode housing is polycarbonate. When using cleaning solutions, take cautions on carbon
tetrachloride, trichlorethylene, tetrahydrofuran, acetone, etc., which will dissolve the housing and invalidate
the electrode.
5 mV MEASUREMENT
5.1 ORP measurement
Press key, and switch the meter to mV measurement mode. Connect ORP electrode (the 301Pt-S
combination ORP electrode is 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.
ORP means Oxidation Reduction Potential. The unit is mV.
5.2 Notes on ORP measurement
5.2.1 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. Table-6 is the data of standard ORP solution for 222 mV.
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