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Chapter 6 ORP Measurement
6.1 ORP Calibration
This section describes the procedures to set the conditions of ORP calibration.
ORP measurement uses platinum or gold-plated metal electrodes. You can correct gaps
between measured values and nominal values of the standard solutions, which resulting
from shifts of the comparison electrode or contamination on the metal surface of the
electrode.
HINT!
Tapping
on the ORP CAL screen allows you to check the current calibration data. To
clear the calibration data, tap
.
1.
Tap the channel setting and the measurement
item in the MEAS screen to set "CH1" and
"ORP".
2.
Press the CAL key to display the ORP CAL
screen.
3.
Wash the ORP electrode with pure water (ion
exchange water), and wipe it off by filter paper or
tissue paper.
4.
Open the internal solution filler port of the ORP
electrode.
5.
Immerse the ORP electrode into a beaker of the
standard solution.
6.
Tap the mV value at the right of "Set:" to display
the numerical-key screen.
7.
Enter the mV value of standard solution to
calibrate, and tap
The concentration of standard solution to
calibrate is reflected.
8.
Tap
9.
When the calibration is completed, the HOLD
indicator is lit, displaying the calibration result.
10.
Tap
to return to the CAL screen.
11.
To start ORP measurement, press the MEAS
key.
.
to start the calibration.
after checking the calibration result
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