Specification Sheet

Supplemental
Instructional
Manual for the
HI 98121:
Water Ionizer
applications
e-mail: [e-mail]
e-mail: [e-mail]
Tech Support
Sales Support
Frequent Questions and Answers
Q. Why doesn’t my tester read high –mV ORP(-250mV to -999mV) anymore?
A. Each time the tester is used in a extremely Alkaline or high –mV ORP sample,
a buildup of minerals occurs on the surface of the Platinum ORP sensor that
interferes with testers ability to read the full –mV scale. Overtime the buildup can
decrease the amount of platinum surface area that comes into contact with the
sample adversely a ecting the sensitivity of the tester. Try cleaning the sensor in
HI7061 cleaning solution for 15 minutes. Note: You may need to re-hydrate the
pH sensor (glass bulb) in HI70300 storage solution for 30-90 minutes if you  nd
the pH reading is slow to respond/stabilize after soaking in cleaning solution.
Q. How often should I clean my pH/ORP sensor in HI7061 cleaning solution?
A. For optimal performance and minimal preparation time before use, clean the
pH/ORP sensor after each use by soaking it HI7061 cleaning solution for 2-3 min-
utes. Note: Cleaning the pH/ORP tester after each use for a shorter duration (2-3
mins) will be less detrimental to the pH sensor while still e ectively preventing
mineral buildup on the surface of the Platinum sensor.
Q. I have cleaned my pH/ORP sensor and still do not see high –mV readings
(-250mV to -999mV), why?
A. It is possible your water Ionizer is not producing the desired alkalinity/-mV
sample. Consult the manufacturer on how to clean or service the unit. If you
are sure the Ionizer does not need service/maintenance you can try polishing
the Platinum ORP sensor with a light abrasive lint-free (emery) material such
as jewelers rouge. The surface of the platinum sensor must not be scratched
during polishing.
Call: 1.800.426.6287
Call: 1.800.426.6287
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