45
45
Remove the protective cap off the ORP electrode.
Wash off any SALT DEPOSITS. This generally confirms the reference junction is free flowing.
If the storage cap is dry, the reference junction may be dry also. Soak the electrode in HI70300 or
HI80300 storage solution for at least one hour.
Keep the reference electrolyte topped off and the fill hole cover off during operation.
Add HI7082 or HI8082 3.5M KCl Electrolyte Solution for double junction electrodes.
Pretreatment
For a faster response, pretreat the ORP metal surface by soaking it for 15 minutes. Pretreatment with
HI7091 Reducing Pretreatment Solution, or HI7092 Oxidizing Pretreatment Solution can prepare the
metal surface for faster electron exchange with sample. See mV and pH to determine what treatment
you should use.
Measurement
Rinse the electrode tip with distilled water. Submerse the tip 3 cm (1¼”) in the sample and stir
gently for a few seconds.
For a faster response and to avoid cross‑contamination of the samples, rinse the electrode tip with a
few drops of the sample before taking measurements.
ORP PROBE MAINTENANCE
MAINTENANCE
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