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power control device

power control device

power control device

(OP)
Hi,

What kind of device should I look for if I want to control the voltage source feeding a gauge based on temperature readings?

What I'm trying to do is to ensure the internal temp of the gauge doesn't get too hot.  So I want to have some kind of temp sensor to read the internal gauge temp and send the readings back to "the device."  Based on the temp range, I want "the device" to switch on/off the power source feeding the gauge.  Better yet, if the device can switch to different voltage levels.  I'm looking at 120V or less, and 1-2A.

I've never done automation control, so I don't even know where to start.  Please point me to right direction.  Thank you in advance.

RE: power control device

So you are OK with cutting power off to your gauge if it starts to get too hot? If so, the simplest method would be to just install a temperature switch in the gauge housing ahead of the incoming power lines. These devices are typically known as "klixons" (as in "clicks on") because a particular ubiquitous version made by Texas Instruments (now Sensata I think) is called that. If you Google kilxon you will find lots of offerings. they are a simple little switch that when warmed up beyond a predetermined threshold, i.e. your max. temp., simple pop and open the contacts, then stay open until the switch cools down again.

JRaef.com
"Engineers like to solve problems.  If there are no problems handily available, they will create their own problems."   Scott Adams  
For the best use of Eng-Tips, please click here -> FAQ731-376

RE: power control device

You may find it productive to spend some time browsing the omega.com web site.
respectfully

RE: power control device

(OP)
Can I use a contactor in series with the power source?  So that I can program my own temp range?

RE: power control device

Yes. No probs. But then you need to know the temperature.

Gunnar Englund
www.gke.org
--------------------------------------
100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...

RE: power control device

If it's just a small amount of control power, i.e. 6A or less, you could get a Thermistor Tripping Relay, then select the right thermistor to give you the temperature range you are looking for.

Something like this;
http://www.sea.siemens.com/icc04/sec08/08-15_16.pdf

along with this
http://www.atpsensor.com/ptc/ptc_stdproducts/ptc_stdproducts_mps/mps.html

JRaef.com
"Engineers like to solve problems.  If there are no problems handily available, they will create their own problems."   Scott Adams  
For the best use of Eng-Tips, please click here -> FAQ731-376

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