Posted by:
Frazenhiemer
at Wed Mar 23 17:23:10 2005 [ Email Message ] [ Show All Posts by Frazenhiemer ]
From the standpoint of heating element wear, control device load contact wear, I don't like the idea that an on/off thermostat turns the heating load full on/full off continually in order to keep the desired temperature within the set point range. A proportional stat is even worse regarding full on/full off continual switching since it controls the heating element with a series of rapid on/off cycles to maintain the desired temperature (contrary to alot of peoples beliefs a proportional stat is harder than an on/off stat on the heating element).
My idea for control of heat cable in a rack I am building is that since It will be in a temperature controled room, I will control the cable with a voltage regulating rheostat ($10). I will adjust the rheostat using the reading of a remote probe thermometer($10). I will also install a ranco on/off thermostat but only as a high limit protector. If the rheostat were ever to fail to a full on condition or were accidentally turned full on, the ranco would open the circuit when a temperature of say 10 degrees above the normal set temperature occured.
[ Hide Replies ]
 Any thoughts on this heat control Idea? - Frazenhiemer, Wed Mar 23 17:23:10 2005
|
