Walchem, Iwaki America Inc.

Improved Control for your Cooling Tower and Boiler

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Courtesy of Walchem, Iwaki America Inc.

The power of microprocessor based programming along with the ease of interfacing with standard Internet based controllers has enabled improved cooling tower and boiler control with just the click of a mouse. Many of these improvements can significantly enhance your chemical treatment program, and provide greater flexibility in your chemical treatment program. These new algorithms offer significant improvement over previous 'simple' control, and provide techniques for providing a significant return on investment for your customers.

1. Time-based 'Spike' ORP Control of Oxidizing Biocides

Traditionally, water treaters have had to choose between standard biocide timer-based programming, or continuous ORP for control of their oxidizing biocides. A new algorithm is now available that offers the best of both worlds for improved total control of your cooling tower.

The new method, referred to as 'ORP Spike' Control, enables low-level ORP control on a continuous basis, with a programmable time-based 'Spike' to a higher ORP level for occasional shock treatment. Programming for the 'Spike' includes a 'hold' time for maximum contact efficacy, and options to lockout bleed or other chemical addition during the 'Spike' event. Simple programming using a standard Internet Explorer interface enables intuitive programming for the control. A single relay output to a single metering pump in now sufficient to achieve improved control.

2. Change Control Settings Automatically when Make-up Water Source Changes

Improved control for systems with multiple make-up water sources is also now made simple. These sources might include city water, reclaim water, well water, or other sources. It is now possible to define individual treatment programs dependent on the quality of the make-up water. Set points for tower bleed, and the inhibitor feed program can be set independently for each specific make-up source.

The source is defined by its' conductivity range. For example, city water might be defined for it's normal variance in conductivity, i.e. 300 to 800 mS. Reclaim water might be defined from 800 to 2000 mS. Choosing 'Multiple Make-up Sources' in your control set-up enables you to set different settings for bleed and inhibitor feed settings. A make-up conductivity sensor in the line determines which makeup source is feeding the tower, and adjusts the settings appropriately. Up to three make-up water sources can be defined - each with it's own settings for control.

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