- 6 -
ORP Calibration
7.1 Pour some 222 mV ORP standard solution into the calibration bottle (to about half volume).
7.2 Rinse electrode in distilled water and dry it. Short press to turn the meter on. Long press to enter
calibration mode. If you need to exit calibration mode, short press
7.3 Dip electrode in the standard solution, stir gently, and allow it to stand still in the calibration solution until a stable
reading is reached. When stable icon comes up and stays, press to adjust the calibration value according to
the table below(also on thesolution bottle
’s label). Then short press to complete the calibration.
222 mV (25˚C) ORP Standard Buffer Solution Calibration Reference Table
Temperature (˚C)
mV
Temperature (˚C)
mV
10
242
30
215
15
235
35
209
20
227
38
205
25
222
40
201
For example, if the temperature is around 25˚C, then adjust the calibration value to 222 mV. If the temperature is around
20˚C, then adjust the calibration value to 227 mV.
Notes
1)
Usually there’s no need to calibrate for ORP testing. When the tester has been used for a long time, users can
test it in 222 mV ORP standard buffer. If the error is big, please calibrate according to the steps in 7.1 to 7.3.
2) The meter has self-diagnosis function. Please refer to the followed chart for detailed information.
Symbol
Self-Diagnosis information
How to fix
is pressed before the
measurement becomes stable
(smiley face comes up)
Wait till the smile icon appears and stays, then short press
During calibration, readings being
unstable for over 3 minutes
1.
Please check whether ORP electrode is damaged or broken.
If so, please replace with a new one.
2.
The platinum pin or junction is severely contaminated.
Please use a soft brush with soap water to clean it
thoroughly. Then soak it in 3M KCL overnight before
performing calibration again.
3.
The electrode is aged (used for over a year and has a much
slower response). A replacement is needed.
If none of the above, please contact us at
(614) 285-3080
