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RAJ KUMAR
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Join Date: Aug 2008
Posts: 56

Temperature Switch

09/02/2008 12:19 AM

Hi,

Could anyone tell me the types of temperature switches and how they works. because i tryed a lot bt i could not found any literature about this.
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Sparkstation
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New Zealand - Member - Interested in everything- see my Profile please APIX Pilot Plant Design Project - Member - Member Engineering Fields - Electrical Engineering - Member Engineering Fields - Power Engineering - Member Engineering Fields - Civil Engineering - Member Hobbies - Musician - Autoharp and Harmonica Hobbies - Hunting - Member Hobbies - Fishing - Member

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Location: Christchurch, (The Garden City), South Island, New Zealand
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#1

Re: Temperature Switch

09/02/2008 12:45 AM

Hello RAJ KUMAR

There are various types of "temperature switch", all of which rely on a physical force, either from the applied heat, removal of heat or both (not simultaneously, of course).

Trip = switching action.

  1. Thermal mechanical - Heat expansion = mechanical trip
  2. Bi-metal - Heater element on bi-metal causes thermal expansion = trip
  3. Thermomagnetic - Magnet loses magnetism on heating = trip - magnet regains magnetism on cooling
  4. Pressure - heat causes expansion of fluid (Gas or liquid) - sensed by pressure switch = trip
  5. Semiconductor -Semiconductor junction conducts more or less with heat = trip
  6. Resistance - Electrical resistance increases with heat = trip
  7. Inductor - Winding inductance varies with heat = trip
  8. Optical - Heat causes Optical junction to switch = trip
  9. Other.....You can try and think about them, reasoning from basic principles, then reply here, with ......

Hope that assists you....

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josej
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Join Date: Mar 2008
Location: Mumbai
Posts: 250
Good Answers: 2
#2

Re: Temperature Switch

09/02/2008 2:20 AM

Thanks
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MAHADEVAN. N
Active Contributor

Join Date: Mar 2008
Location: India
Posts: 10
#3

Re: Temperature Switch

09/03/2008 1:03 AM

You can go to any site and search for "thermostats" & "temperature controllers". You will get lot of information.

All the best!

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 N. Mahadevan
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