[time-nuts] enclosure temperature controllers

jimlux jimlux at earthlink.net
Tue Mar 16 01:42:19 UTC 2010


Don Latham wrote:
> hello the group:
> I've just installed a new "mercury-free" thermostat in my shop. I looked
> the thing over and realized it has everything needed to control a
> "constant temperature" enclosure. There's a diode used as temp sensor,easy
> to remote with two wires, a place to put two AA batteries, a pot to adjust
> the set temperature, all needed circuitry for a bang-bang controller with
> 1deg F hysteresis, uses a latching relay so the batteries last a long
> time, a low battery indicator, and an easily backengineered circuit board,
> and a low price. There is provision for external power as well. The one I
> bought is a rite-temp model 6005; distributed by home despot. And it's
> relatively cheap, about 20 devalued rasbuckniks. All that's required is
> whatever needed for a heater and its power supply. Unfortunately, not for
> 110 volts but I didn't look at the relay to get the capability; that may
> be a lawyer problem rather than a capacity problem.
> Don
> 
probably runs on 24VAC... a "doorbell transformer" is what you need. 
They're current limited.  Then, a couple 12V lightbulbs or a suitable 
resistor as a load.




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