Markings on Type S Thermocouples and lead wire colors

strict warning: Only variables should be passed by reference in /home/hotkilns/public_html/sites/all/modules/captcha/captcha.inc on line 61.

Search Knowledgebase

Knowledgebase FAQ

  • See the Sales FAQs for Frequently Asked Sales and Preorder Questions
  • The Knowledgebase is organized into a series of questions and answers having to do mostly with technical troubleshooting and understanding of kilns.
  • Although we write this for our own kilns many of these articles apply to other makes - although L&L takes no responsibility for that.
  • Many Knowledgebase articles have Actions, PDFs and Videos associated with them.
  • Actions are specific actions for you to take during the troubleshooting or repair process.
  • Each Action may also have Videos and PDFs associated with it and, in addition, specific Cautions.

Cautions

Markings on Type S Thermocouples and lead wire colors

Question: On the thermocouple terminal block of our Type S thermocouple, one screw is clearly labeled with a bright red ‘+’ and the other has a dark black ‘-‘. However, in thermocouple wire, the negative leg is always red (at least in the US). Could you please let me know if in the factory you connect the red to negative/black to positive controller input terminals, or if you correct for the labeling of the thermocouples, and have red to positive?

Answer: On our type S thermocouples (which we get from Europe) the "+" is marked with red and the "-" is marked with black. The lead wire we use (from the USA) is red for negative and black for positive. (this answer is true for non-European kilns). The worse that can happen if the thermocopule wires get reversed is that the control will read negative which will create a quick alarm condition.