Detecting The Rh Value; Determining The Rh Value By Manually Inputting The Ph Value - JUMO 202710/20 Operating Manual

5 Measuring
5.4

Detecting the rH value

Selecting the measurand
Definition
5.4.1

Determining the rH value by manually inputting the pH value

Prerequisite:
Measuring without temperature probe
Measuring with temperature probe
18
If the device has been configured for a different measurand in a user-
defined operation, first select the measurand "rH" (see "Parameter "InP":
selection of a measurand", page 35).
The rH value is a value calculated from a pH and a redox measurement. It is
used, for example, to describe the antioxidant power of food. This is a mea-
surement used to determine the ability of food to reduce harmful free radicals
(bioelectronics according to Prof. Vincent).
There are two ways of determining the rH value using this device:
• by manually inputting the pH value or
• by automatically transferring the pH value from a pH measurement
• The pH value of the measurement solution must be known.
• A redox combination electrode must be connected to the device.
Briefly press the
Adjust the temperature value of the measurement solution using the
keys.
Briefly press the
Adjust the pH value of the measurement solution using the
Confirm and save the entries with the
Insert the redox combination electrode into the solution and gently stir.
rH mV mV pH
H
ATC ok CAL AL Logg pH
Briefly press the
Adjust the pH value of the measurement solution using the
Confirm and save the entries with the
Insert the redox combination electrode into the solution and gently stir.
key.
key again.
The determined rH value appears
rH mV mV pH
H
on the main display, the input val-
ues for the temperature and pH
appear alternately on the subsidi-
ary display of the device.
ATC ok CAL AL Logg pH
key.
key.
key.
and
and keys.
and keys.