HND-R106
page 12
HND-R106 K09/0422
There is no calibration comparable with that of the pH measurement. However, the
electrode’s capability can be checked with ORP test solutions (for example HND-
Z074).
Suitable ORP electrodes: e.g. HND-RF08
9.3 rH measurement
The rH value is a calculated value of a pH and an ORP measurement. For
example, it is used to describe the anti-oxidative effect of food. This is a measure
for the ability of food to reduce harmful free radicals.
To measure the rH value of a solution, proceed as follows:
9.3.1
Manual input of pH value (and temperature)
You can set the value for pH and temperature (if no temperature sensor is
connected) manually. Press key
shortly and set the temperature value with
keys
and
Press
shortly again and enter the pH value. Confirm with
.
9.3.2
Automatic input of pH value from preceding pH measurement
It is important that the pH and ORP electrodes are in sound condition and that
they are cleaned and dried well before they are inserted to the solution.
First place pH and ORP electrode and temperature probe in the solution and stir
carefully.
1. Measuring pH value:
Connect the pH electrode and temperature probe to the device.
Then set device to pH measuring mode and calibrate electrode if necessary
(p.r.t. chapter 9.5 Calibration of pH measurement and chapter 10
Configuration).
Measure the pH value of the solution and store the measured value with
.
Do not turn off the device until the tH measurement is finished. If the device is
turned off the saved pH value is deleted and has to be set manually for the
following rH measurement.
2. Get the rH value:
Connect ORP electrode and set device to rH measuring mode. The main
display shows the calculated rH value of the solution, the secondary display
shows the prior measured pH value and the temperature alternatingly.
