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What is a thermocouple - Heating & Cooling

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A Thermocouple is a sensor used to measure temperature. Thermocouples consist of two wire legs made from different metals. The wires legs are welded together at one end, creating a junction. This junction is where the temperature is measured. When the junction experiences a change in temperature, a voltage is created.

Thermocouple-Thermocouples-What is a thermocouple-Types of ...

www.thermocoupleinfo.com/

Posted on Dec 13, 2016

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How does the thermocouple in a gas geyser work in a junkers wall mounted gas geyser?


Thermocouple sits in the pilot light flame and generates a small amount of electricity that tells the control that the pilot light is lit. If the pilot goes out, it shuts off gas so the place won't fill with gas and explode.
https://www.youtube.com/watch?v=igxYxhD82lU
Thermocouple What is Thermocouple How does Thermocouple work

http://en.wikipedia.org/wiki/Thermocouple
Thermocouple Wikipedia the free encyclopedia

Feb 07, 2015 | Heating & Cooling

1 Answer

Replacing thermocouple


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A thermocouple actually slides into a keeper that it can be withdrawn from with some steady pulling with needle nose pliars at the base of the thermocouple. Some mounts are screwed and the sleeved thermocouples, keeper is mounted in this.
I almost always just pull it out from it's base.

Oct 19, 2013 | Sterling Heating & Cooling

3 Answers

Maybe it sound strange but does anyone know where I can buy a thermocouple online?


Don't worry, it's not strange. I've also done some research into thermocouples. I came across a website that specializes in them;
Good Luck with your search
http://thermocouple-online.com/

Jan 28, 2013 | Plumbing

1 Answer

Fused Terminal Block on Refrigerator


  1. Signal Integrity
    • One benefit of using a terminal strip to connect the thermocouple wires is signal integrity. Since the thermocouple has a temperature probe located on the end of the wires, a signal must be sent from the probe to the thermocouple. The equipment and machinery will work intermittently, if the signal strength is not maintained. For example, if the probe senses the flame on the furnace, it sends a signal to the thermocouple. Once the flame goes out, a signal is sent to the thermocouple, which shuts off the gas.
    Shield
    • The terminal strips have a covering, or shield, to protect the thermocouple wires. You can open the strip and gain access to two metals for testing. You must cut off the insulation surrounding each metal wire and insert them into a terminal strip to make the proper connection. The cover protects those bare wires from dirt and debris. The cover can be removed when troubleshooting the thermocouple and wiring. Without the terminal strip, you would have to cut off each wire's insulation to test the signal strength and voltage between the probe and the thermocouple.
  2. Transmitter
    • A thermocouple sensor that has to carry signals over a long distance requires a thermocouple transmitter to strengthen the signal. Using terminal strips makes it easier to connect a transmitter to the thermocouple device. The terminal strips also lengthen the thermocouple wires. If you need to extend the distance from the probe to the thermocouple, you can add additional wires and splice them with terminal strips to increase the distance. It is like adding an extension cord to an outlet, so you can extend the distance between the outlet and the television.
    Connection
    • Another benefit of using a terminal strip is that the strip enables a better electrical connection between the two thermocouple wires. Without a terminal strip, you would have to introduce signal compensation metals for the thermocouple sensor to get an accurate temperature reading between the two metals. Since the terminal strip uses the same metals found in the thermocouple wires, your electrical connection will not lose voltage. A decrease in voltage can trip the thermocouple.

Jan 09, 2013 | Dryers

1 Answer

Can't light a vulcan heritage gas heater, the pilot light lights, but as soon as I try to lift my finger off the button to ignite the heater, the pilot flame always goes off.


Hi and welcome to FixYa, I am Kelly.

What you are experiencing is the lack of a signal from the thermocouple to the gas valve. I.e. the thermocouple is not passing heat information at all. This is caused by either a defective thermocouple, a dirty mating area where the thermocouple connects to the gas valve or... an improperly positioned thermocouple that is not "in the flame" with the pilot lit.

  • First make sure the FIRE end of the thermocouple is in the flame when lit. (reposition if necessay)
  • Next disconnect the thermocouple by unscrewing the fitting on the top of the gas valve. (No gas will come out) Clean the metal mating area as best you can and then re-install the thermocouple. Just a good snug fit. Once you feel it come snug add 15 degrees of tightening motion with a wrench.
Attempt to light the pilot... wait 45 seconds to 1 minute while holding the pilot button down before letting it up. If it stays lit.... GOOD JOB. If it goes out the next step is to replace the thermocouple. If after replacing the thermocouple it does not stay lit the remedy is to replace the gas valve. There are no short cuts and the sequence of repairs is just as I stated in order.

You can remove your old thermocouple and walk in to almost any appliance parts supply or Plumbing and heating supply to purchase the correct thermocouple without a part number. They will match it up with yours.

Thanks for choosing FixYa,
Kelly

Feb 20, 2011 | Heating & Cooling

1 Answer

I changed the thermocoupler but problem remains the same: pilot goes out after about 10-15 minutes. I have Williams model 250912. Please help! How do I test if new thermocoupler is also bad, beside...


Remove the thermocouple and take a pencil eraser to the hole. Clean the corrosion out the hole. Reconnect the thermocouple tight. The tip of the flame must hit the tip of the new thermocouple.
If the flame is hitting the middle of the thermocouple that is called wash through (no good) The bimetal tip of the thermocouple is made of nickel and copper layered. When heated it produces millivolts. This holds the electromagnet in and that is your safety feature. Thank you Ralph Nader.
themobilian_1185.jpg

Jan 30, 2011 | Williams 2509612 Ceramic Mid-Size Heater

1 Answer

How to fix F7 in turbochef


F7: Thermocouple Open

CC Thermocouple

Reads 999?F/C or

IR Thermocouple
Reads 1999?F/C



1. Check the connection of open thermocouple on the I/O control board.

If the connection is OK, verify thermocouple is not an open circuit

by using your ohm meter. The cook cavity thermocouple should

measure approximately 4-5 ohms and the IR thermocouple should

measure approximately 30-40 ohms. Measure at the I/O control board

40-pin connector.

o Thermocouple indicates open circuit: Replace defective thermocouple.
o Thermocouple OK: Replace the I/O control board.

Oct 04, 2010 | TurboChef TORNADO Electric Oven

1 Answer

My reddy 30 heater will not stay lit after starting, I have held the switch down for longer than 30 sec, but it just want stay lit


The thermocouple is what tells the gas valve to supply or not supply gas. Several things can cause the thermocouple to malfuntion.
1. pilot light jet is clogged and will not allow the pilot light to reach and heat the thermocouple. Repair by cleaning the pilot light jet out.
2. corrosion on the thermocouple which will also not allow the flame from the pilot to heat the thermocouple properly. Repair by sanding the thermocouple lightly with sandpaper
3. Thermocouple is bad and needs replacement.

Mar 25, 2010 | Heating & Cooling

2 Answers

Pilot lights but main burner dose not light when turned on


possibly a fowled thermocouple if the thermocouple doesn's sense the pilot flame then it will not send a signal to the gas valve telling it that its okay to open cause the pilot is lit.

Dec 28, 2009 | Lite On Laars Lite 2 Heaters: 250,000BTU...

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