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Re: McDonald-Miller for level controll on DA tank


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Posted by rick on December 14, 2006 at 19:42:28:

In Reply to: McDonald-Miller for level controll on DA tank posted by SUNY Cortland Heating Plant on December 13, 2006 at 23:36:02:

: 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.




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