14
submerge it in soaking solution for 24 hours. The method to prepare 0.1mol/L hydrochloric acid: dilute 9mL
hydrochloric acid in distilled or deionized water to 1000mL. For serious passivation, submerge the bulb in
4% HF (hydrofluoric acid) for 3-5 seconds, and wash it in distilled or deionized water, then submerge it in
the soaking solution for 24 hours to renew it.)
4.6.5. Clean contaminated glass bulb and junction (see Chart – 7)
Chart – 7 Clean contaminated glass bulb and junction
General tough contaminants
Apera Electrode Cleaning Solution (SKU: AI1166)
Dilute detergent (weak alkaline)
Dilute alcohol, acetone, ether
Apera Electrode Cleaning Solution (SKU: AI1166)
Dilute bleacher, peroxide
Notes:
The 201T-F electrode housing is polycarbonate. When using cleaning solutions, take precautions
with carbon tetrachloride, trichlorethylene, tetrahydrofuran, acetone, etc. as these 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 301Pt-C ORP electrode (SKU:
AI1303, 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 is in short for Oxidation
Reduction Potential. The unit is mV.
5.2 Notes:
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.
5.2.2. Clean and activate ORP electrode
After the electrode has been used over long period of time, the platinum surface will get contaminated and
will lead to inaccurate measurements and slow responses. Please refer to the following methods to clean
and activate ORP electrode:
(a) For inorganic pollutants, submerge the electrode in 0.1mol/L dilute hydrochloric acid for 30 minutes,
then wash it in distilled or deionized water, then submerge it in the soaking solution for 6 hours.
(b) For organic or lipid pollutants, clean the platinum surface with detergent, then wash it in distilled or
deionized water, then submerge it in the soaking solution for 6 hours.
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