The WDS Series of pH and ORP electrodes are differential sensors that are available with a choice of preamplifiers, one for Walchem controllers and another for certain other pH/ORP controllers. The differential measurement technique is reliable and immune to ground loop related problems.
This technique utilizes two glass electrodes to make the measurement differentially with respect to a third metal electrode. The second glass electrode is immersed in pH 7 buffer inside the electrode body, but electrically connected via a porous double junction salt bridge. If the internal solution becomes contaminated, the sensor may be rejuvenated by replacing the solution and salt bridge.
Four models of sensors are available:
WDS-PHW (for pH) and WDS-MVW (for ORP) contain a differential preamplifier that is compatible with Walchem controllers. These electrodes will have three twisted pairs plus a shield wire. WDS-PHC (for pH) and WDS-MVC (for ORP) contain a differential preamplifier that is compatible with competitive, conventional pH/ORP controllers. These will have 5 wire cables with a shield wire.
The WDS Series are threaded at each end, allowing for both submersion and in-line mounting with a single electrode.
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