IM 12B03D02-01E
8-1
8
.
ORP Meter
8. ORP Meter
8.1 ORP Measurement
Use a dedicated ORP sensor for ORP (oxidation-reduction potential) measurement.
The ORP sensor is a KCl refillable type with a platinum sensing electrode and looks
the same as a KCl refillable type pH sensor. The measuring temperature range of the
ORP sensor is 0 to 80°C, the same as that of the pH sensor.
• The default setting for measurement unit of the Model PH72 Personal pH/ORP
Meter is pH. Press
F/ENT
key and follow the procedure described in Section 5.3
(3), “Set measurement unit (PV.U) panel” to move to the display with mV unit.
F0801.ai
Figure 8.1 Example of Displayed ORP Value
• Immerse the sensor in a sample solution and read after the reading has
stabilized.
• To hold a measured value, press
HOLD
key. Press
DATA
key to save a
measured value (see Section 3.4).
Note:
Unlike pH sensors, ORP sensors do not require calibration.
A temperature element incorporated in an ORP sensor is used for measuring the
temperature of a solution, e.g., measuring the temperature of a check solution during
sensor check (see Section 8.3).
