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

5 Measuring
5.4

Detecting the rH value

Selecting the measurand
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).
Definition
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
5.4.1

Determining the rH value by manually inputting the pH value

Prerequisite:
• The pH value of the measurement solution must be known.
• A redox combination electrode must be connected to the device.
Measuring without temperature probe
Briefly press the
Adjust the temperature value of the measurement solution using the
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.
ATC
Measuring with temperature probe
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.
18
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key.
keys.
key again.
rH mV mV pH rH mV
H
ok CAL AL Logg pH ATC ok CAL
key.
key.
The determined rH value appears
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.
AL Logg pH
key.
and
and keys.
and keys.