132
ORP Calbration/Adjustment
The potential of a redox electrode is calibrated using a redox (ORP) buffer solu-
tion. In the course of that, the difference between the measured potential and
the potential of the calibration solution is determined. This potential difference
is printed on the calibration solution bottle and is defined as the voltage across
the redox electrode and a reference electrode.
Examples:
220 mV
Pt against Ag/AgCl, KCl 3 mol/l
427 mV
Pt against SHE
During measurement this difference is added to the measured potential.
mV
ORP
= mV
meas +
∆
mV
mV
ORP
= displayed oxidation-reduction potential (measured ORP)
mV
meas
= direct electrode potential (ORP input, see Sensor monitor)
∆mV
= delta value, determined during calibration
ORP related to the standard hydrogen electrode (SHE)
The oxidation-reduction potential can also be calibrated automatically with
respect to the standard hydrogen electrode (SHE). To do so, you must first
select the reference electrode used (see Parameter setting).
The temperature behavior of the reference electrode is automatically taken into
account.
You can choose from the following types of reference electrodes:
Ag/AgCl, KCl 1 mol/l
(silver/silver chloride)
Ag/AgCl, KCl 3 mol/l
(silver/silver chloride)
Hg, Tl/TlCl, KCl 3.3 mol/l
(Thalamid)
Hg/Hg
2
SO
4
, K
2
SO
4
saturated
(mercury sulfate)
Calibration / Adjustment
ORP calbration/adjustment
ORP calibration
Summary of Contents for Protos 3400
Page 12: ...12 ...
Page 160: ...160 ...
Page 177: ...177 Appendix Buffer Table Mettler Toledo ...
Page 179: ...179 Appendix Buffer Table DIN 19267 ...
Page 181: ...181 Appendix Buffer Table Techn Buffers to NIST ...
Page 182: ...182 Appendix Buffer Table Hamilton ...
Page 183: ...183 Appendix Buffer Table Kraft ...
Page 184: ...184 Appendix Buffer Table Hamilton A ...
Page 185: ...185 Appendix Buffer Table Hamilton B ...
Page 186: ...186 Appendix Buffer Table HACH ...
Page 206: ...206 Index ...
Page 207: ...207 Index ...