- 13 -
Table-8 Clean contaminated glass bulb and junction
Contamination
Cleaning Solutions
Inorganic metal oxide
Dilute acid less than 1mol/L
Organic lipid
Dilute detergent (weak alkaline)
Resin macromolecule
Dilute alcohol, acetone, ether
Proteinic haematocyte sediment
Acidic enzymatic solution (saccharated yeast tablets)
Paints
Dilute bleacher, peroxide
Special Notes:
1)
The 201T-S Plastic 3-in-1 Combination pH Electrode that comes with this meter will NOT give
accurate and stable pH readings when testing distilled or deionized water. This is because
these purified waters do not have enough ions present for the electrode to function properly.
To measure purified water pH levels, users need to use a specialized electrode. Visit
www.aperainst.de/electrodes
and find the compatible Pure Water LabSen electrode for your
meter in order to accurately test purified waters.
2)
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
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.
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-9 is the data of standard ORP solution for 222 mV.
Table-9
°C
10
15
20
25
30
35
38
40
mV
242
235
227
222
215
209
205
201
