Panel-Mount PH/ORP Controllers

Aug. 19, 2004
The W305 single and dual-input panel-mount pH/ORP controllers let designers add a second sensor rather than a second controller.


The controllers use digital inputs for each input channel to prevent control based on stagnant samples or empty tanks. Output limit timers prevent runaway chemical addition. Manual output activation is said to simplify making chemical additions safely by hand and testing outputs during installation. Other features include an optional calibration reminder, automatic probe wash, and automatic buffer recognition. Each input channel can measure temperature for automatic probe-temperature compensation or process-temperature monitoring. The conrollers have five standard relays and support a wide variety of control and alarming modes. The 1/2 DIN, NEMA-4X controllers are UL/CSA/CE certified and support one or two sensors in any combination of pH or ORP.

Walchem Corp.,
5 Boynton Rd., Holliston, MA 01746,
(508) 429-1110,

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