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Click below to enlarge and enhance photo |
Click below to enlarge and enhance photo |
MPM High Temperature Reference
Electrode
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MPM High Temperature Reference Electrode
Installed in Piping System |
Introduction
Corrosion of steel in elevated temperature aqueous environments is a
significant problem in many industries. Therefore,
high-temperature/high-pressure reference electrodes are needed for various
corrosion measurements such as polarization, galvanic corrosion, electrochemical
noise measurement, and electrochemical corrosion potential (ECP) measurement.
A high-temperature/high-pressure reference electrode has been developed for
applications in the primary system of operating nuclear power plants. The
electrode has been designed to operate in high radiation environments and is
capable of withstanding rapid temperature and pressure transients.
System Features
The MPM high temperature reference electrode has the following features:
- The reference electrode is a pressure balanced external reference
electrode
- The thermal liquid junction potential is accounted for in the conversion
of the measured potential to the standard hydrogen electrode (SHE) scale
- Software is provided for continuous data acquisition and determination of
the potential versus SHE scale at temperature
- The electrode can operate continuously in normal water chemistry, hydrogen
water chemistry, or in aqueous environments with chemical additions to control
corrosion
- The electrode is capable of continuous operation at 290ºC
for over 2 years before replacement
- The electrode can operate at pressures in
excess of 2,000 psig
- The electrode can withstand rapid
depressurization events as well as thermal ramps of up to 485ºC per minute
System Upgrades
The high temperature reference electrode can be provided with several
options:
- Miniature pressure vessel for research or plan applications
- Flow grabber attachment for in-service piping applications where flow rates
are too high for direct installation of the reference electrode
- Data acquisition system with computer and software
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