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SM29氧化还原电极
SM29-AU8氧化还原电极SM29-PT9厂价
SM29 Redox Electrodes
Redox measurements are a potentiometrical measurement of the oxidizing/reducing power of a liquid. To be able to measure this equilibrium of reversible redox reactions the electrodes used should be inert. Noble electrodes such as Platinum (Pt) and Gold (Au) are widely used for this purpose and seem to approximate the behaviour of an ideal inert electrode. Platinum is used most widely, has excellent chemical resistance but suffers slightly from chemosorption of Oxygen, which slows down its response.
The potential of reference electrodes is depending on their
composition. A table with the actual values for each system is given next. All values refer to 25°C. The reference system is also indicated on the textplate of the electrode.
System |
Fill solution |
Value against Standard Hydrogen Electrode |
Ag/AgCl |
3.3 m. KCl |
203 mV |
Ag/AgCl |
sat. KCl |
196 mV |
Combined Redox Electrodes
For redox measurement Yokogawa offers non-flow general purpose electrodes and a heavy duty flow electrode. All electrodes are equiped with a solid platinum pin to provide long
lifetime, even in processes that harm the platinum electrodes such as hypochloride.
METAL ELECTRODES
l Polarisation free measurement by (patented) inert metal surface.
l Dome shaped cup
l Temperature range 0…130°C
l Steam sterilisable.
l Maximum process pressure: 1 MPa (10 bar)
The Redox (ORP) electrode can be used in combination with all
reference electrodes in the program of Yokogawa.
The potential of reference electrodes is depending on their
composition.
A table with the actual values for each system is given next. All
values refer to 25°C
System |
Fitting |
Absolute value |
Value against SCE |
Ag/AgCl Ag/AgCl Calomel (SME) |
1 m KCl sat. KCl sat. KCl |
233 mV 188 mV 241 mV |
- 8 mV - 45 mV 0 mV |
The reference system is also indicated on the textplate of the electrode
TYPE |
TEMP. RANGE |
PROCESS PRESSURE |
METAL SURFACE |
SM29-AG8 SM29-AU8 SM29-PT9 |
0…130°C 0…130°C 0…130°C |
maximum 1 MPa (10 bar) maximum 1 MPa (10 bar) maximum 1 MPa (10 bar) |
silver gold solid platinum |