5.7.5 Clean contaminated glass bulb and junction (please refer to Table-8)
Table-8 Clean contaminated glass bulb and junction
Dilute acid less than 1mol/L
Dilute detergent (weak alkaline)
Dilute alcohol, acetone, ether
Proteinic haematocyte sediment
Acidic enzymatic solution (saccharated yeast tablets)
Dilute bleacher, peroxide
6 mV measurement
6.1 ORP measurement
Press key, and switch the meter to mV measurement mode. Connect ORP electrode (the 301Pt-C
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.
6.2 Notes on ORP measurement
6.2.1 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 (Zobell) ORP solution for 222 mV.
Table-9
6.2.2 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 distilled water, then submerge it in the electrode storage solution 00653-04 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 electrode storage solution 00653-04 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 electrode storage solution 00653-04 for 6
hours.
To Next Page
Loading...
