Walchem’s WEL Series electrodes are cost-effective differential pH and ORP electrodes for industrial applications. They are modular in design with a rugged CPVC housing that contains the electronics. pH and ORP cartridges can easily be connected or replaced in minutes without tools. The cartridges feature a unique threaded interlock connection and a double o-ring seal, ensuring a watertight fit and secure seating at all times.
The optional differential preamplifier or 4 to 20 mA transmitter, and temperature compensation element are in the housing, and are not thrown away when the electrode needs replacement. The electrode is powered by the controller it is connected to, so the signal is always preamplified and there are no batteries to go dead. A titanium solution ground rod integral to the housing enables the differential measuring technique. This results in prolonged electrode life and reliable measurement, resistance to stray voltages and currents or ground loop problems.
How It Works
The number of parts and the installation will vary with the model ordered. The electrode consists of a replaceable pH or ORP electrode cartridge, an electrode housing, and a mounting tee and adapter for in-line mounted models.
Electrode Cartridges
There are four pH electrode cartridge choices. Each is best suited for specific applications:
WEL-PHF is a flat surface glass pH electrode which will function well in almost any application, and will perform especially well if the solution tends to coat an electrode with solids or oils.
WEL-PHB is a bulb-type glass pH electrode which will function well in clean chemical applications.
WEL-PHH is a flat surface glass pH electrode which is highly resistant to attack by acidic fluoride solutions that would quickly etch the glass of a standard pH electrode.
WEL-PHLI is a flat surface glass pH electrode with a special gel suitable for use in low ionic strength water, with conductivity between 10 and 100 µS/cm.
There are two choices of ORP electrode cartridge:
The WEL-MVF is a flat surface platinum electrode which will work in almost any application.
The WEL-MVR uses a platinum rod and is used where the oxidizer level is below 0.25 mg/l.
Further Information
See Downloads tab.
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