7 Reference
7.2 mV (oxidation-reduction potential [ORP]) measurement
D-52/53/54/55
185
If the prepared ORP standard solution is allowed to
stand in open air for one hour or more, it may undergo
transformation. For this reason prepared ORP standard
solution cannot be stored.
When measuring a solution that has low concentrations
of oxidants and reductants after conducting an
operational check using a standard substance, the
measured values may not stabilize or the results of
measurement might not be repeatable. If this is the case,
use the meter after immersing the electrodes in the
solution again and mixing it thoroughly.
●
Precautions when measuring actual samples
・
Note that when measuring the ORP of a solution that
has extremely low concentrations of oxidants and
reductants (such as tap water, well water, or water
treated with purifying equipment), there may be less
responsiveness, repeatability, and stability, in
general.
・
When alkaline water is allowed to stand, its ORP
undergoes considerable changes. Always measure
alkaline ION water promptly.
Summary of Contents for D-25
Page 2: ......
Page 11: ...CONTENTS VIII HORIBA ...
Page 31: ...1 Overview of the Meter 1 9 Using the protective cap D 53 54 55 20 HORIBA ...
Page 75: ...2 Taking Measurements 2 9 Dissolved oxygen DO measurement D 55 64 HORIBA ...
Page 139: ...4 RS 232C communications 4 5 Communication example using the HyperTerminal 128 HORIBA ...
