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Posted by Robert Marcoux on March 06, 2007 at 13:22:26:
In Reply to: Re: McDonald-Miller for level controll on DA tank posted by sid on December 18, 2006 at 15:45:28:
: : : We use a McDonald-Miller for level controll on our DA tank. This holds a tight and constant level for us (about 1/2 inch), but the repeated cycling of the switch wears it out in about six months. Does anyone have any sugestions of what else can be used for our level controll. I thought about stagering two MM's about five inches apart, the lower one to turn condensate pumps on and the upper one to turn it off. but i fear that this will add water to fast and drop the DA tank temp and thus limit the oxygen removal. Thanks.
: : I'd suggest using conductivity probes producing an analog signal to a level control valve. Contact me for more details on this system if you are interested.
: seems like any good old float valve would work
::: These McDonald-Miller 21 valves are only good for low make-up requirements such as heating boilers. Any high make-up system must use sensors and control valve.