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themocouple
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Fred.Rowe
Knifemaker / Craftsman / Service Provider
- Joined
- May 2, 2004
- Messages
- 6,848
Hi Vern,
The temperature is measured at the tip of the thermocouple. Place the tip where you want to take the reading. They make casings for this or you can put the TC inside a section of black iron pipe with a pipe cap on the end.
I have a Watlow pid on my heat treat forge and am using a K thermocouple, with it. What do you want to know about the hook up?
Fred
The temperature is measured at the tip of the thermocouple. Place the tip where you want to take the reading. They make casings for this or you can put the TC inside a section of black iron pipe with a pipe cap on the end.
I have a Watlow pid on my heat treat forge and am using a K thermocouple, with it. What do you want to know about the hook up?
Fred
- Joined
- Mar 18, 1999
- Messages
- 2,114
You could buy a thermowell to put the thermocouple inside, as Fred referred, but it will cost about 35 bucks.
The simplest way, if heat treating with it, is to place a 2" pipe in your forge and place the thermocouple inside the pipe and adjust the fuel and air accordingly and LET IT SETTLE OUT to the proper temperature. In other words, let it maintain that temperature for 15-20 minutes or so. The blade you are heat treating will go inside the pipe as well. I must reiterate, this is for heat treating, not for forging. Just place your pyrometer off to the side somewhere. I could get my forge to to stay at 1450 degF, plus or minus 10 degrees doing it this way.
Craig
The simplest way, if heat treating with it, is to place a 2" pipe in your forge and place the thermocouple inside the pipe and adjust the fuel and air accordingly and LET IT SETTLE OUT to the proper temperature. In other words, let it maintain that temperature for 15-20 minutes or so. The blade you are heat treating will go inside the pipe as well. I must reiterate, this is for heat treating, not for forging. Just place your pyrometer off to the side somewhere. I could get my forge to to stay at 1450 degF, plus or minus 10 degrees doing it this way.
Craig
- Joined
- Mar 18, 1999
- Messages
- 2,114
As mentioned, Type K is the one you will need.
Type J is only good to 1600 degF, K is good to 2400 degF. Type K also has a yellow jacket, or outside jacket or casing. Type J has a black jacket. Remember that with any thermocouple, red is the negative lead.
The device or controller used will have to be able to accept that particular thermocouple. Some devices are programmable as to what sort of input they may have.
This is representative of what is needed:
Located at:
http://www.omega.com/ppt/pptsc.asp?ref=KMQXL_NMQXL&Nav=tema06
For a little over 30 bucks and you are in business. You will need a bit of thermocouple wire as well but it is not expensive.
Craig
Type J is only good to 1600 degF, K is good to 2400 degF. Type K also has a yellow jacket, or outside jacket or casing. Type J has a black jacket. Remember that with any thermocouple, red is the negative lead.
The device or controller used will have to be able to accept that particular thermocouple. Some devices are programmable as to what sort of input they may have.
This is representative of what is needed:
Located at:
http://www.omega.com/ppt/pptsc.asp?ref=KMQXL_NMQXL&Nav=tema06
For a little over 30 bucks and you are in business. You will need a bit of thermocouple wire as well but it is not expensive.
Craig
- Joined
- May 4, 2001
- Messages
- 1,553
Using a thermowell (bought or made) is a very good idea.
As far as color code is concerned, RED is the negative when dealing with TCs made for the US and Canadian market. The Europeans and Japanese use the red as the positive lead. Make sure of what you've got. You will know that you have the polarity reversed if you are reading negative temperatures.
As far as color code is concerned, RED is the negative when dealing with TCs made for the US and Canadian market. The Europeans and Japanese use the red as the positive lead. Make sure of what you've got. You will know that you have the polarity reversed if you are reading negative temperatures.