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.
The WDS Series are threaded at each end, allowing for both submersion and in-line mounting with a single electrode.
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