ORP Calibration
The meter allows 1 point calibration in the ORP mode, but calibration
is not necessary unless exact readout agreement with a work
standard and at a specific ORP value is needed.
1.1 Rinse the ORP electrode with distilled water. Place the electrode
into the standard solution, stir gently and wait until the
measurement is stable.
1.2 Press the Cal key, the meter enters the calibration mode.
1.3 If necessary, press the / key to set the calibration value.
1.4 Press the Enter key, the meter will show and return to the
measurement mode. Calibration is completed.
To exit the calibration without saving changes, press the Meas key.
Viewing the Calibration Log
2.1 Press the MR key in the ORP measurement mode and press the
key until the meter shows / (Electrode / Page 2).
2.2 Press the Enter key, the meter shows the last calibration date.
2.3 Press the key to view the offset potential.
2.4 To exit the calibration log, press the Meas key.
If the meter is not calibrated with standard solution, the display will
show ---- only.
Electrode Maintenance
• Rinse the ORP electrode thoroughly with distilled water after use.
• In the corrosive chemicals, viscous solutions and solutions with
heavy metals or proteins, take readings quickly and rinse
electrode immediately.
• If the electrode response becomes sluggish, refer to the
instructions below to clean the electrode.
(1) Inorganic Deposits
Place the electrode in 0.1M HCl solution for 10 minutes. Rinse
the electrode with distilled water and soak in 4M KCl solution
for at least 6 hours.
(2) Oil or Grease
Place the electrode in detergent such as dishwashing liquid for
about 30 minutes. Rinse the electrode with distilled water and
soak in 4M KCl solution.
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