Posted by:
markg
at Tue Mar 24 13:58:14 2009 [ Email Message ] [ Show All Posts by markg ]
You actually answered your own question when you said, "I put the thermostat probe on the Flexwatt and the thermometer in the box ontop of the plastic and under the paper towels.."
If you want the controller setpoint to match closely to what your thermometer reads, then the controller probe must be placed where the thermometer is placed. Anywhere else and there may be a discrepency. Depending on the physics of the setup, as in substrate, height of box over Flexwatt, surface Flexwatt rests on, ambient air exposure, heat capacity of the air (humidity), the discrepency can be large or small. In an enclosed rack, the discrepency is usually small. In an open setup like yours, the discrepency is often larger. ----- Mark
[ Hide Replies ]
|