Thermocouples (TCs)
What is a Thermocouple- Really?
Thermocouples are pairs of dissimilar metal wires joined at least at one end, which generate a net thermoelectric voltage between the the open pair according to the size of the temperature difference between the ends, the relative Seebeck coefficient of the wire pair and the uniformity of the wire-pair relative Seebeck coefficient.
Thermocouple Types and More
- Thermocouple Types, Letter Designations, Construction The ISA in the USA started the standards on Thermocouple nomenclature that includes the letter conventions used to describe certain alloy wire pairs. This is now carried on around the World and ASTM Committee E20 on Temperature provides the standard (ASTM E 230) that is now the American National Standard for the letter designation, the calibration tables, the color coding and recommended use limits of the most common types of thermocouple wire pairs
- Calibration Tables-Downloadable Courtesy NIST & Pyromation in Fort Wayne, Indiana USA
- Calibration Tables – NIST ITS-90 Thermocouple Database, NIST Standard Reference Database 60, Version 2.0 (Web Version) Based On NIST Monograph 17.
- Recommended Use Limits and Tolerances Maximum temperatures by thermocouple type and construction and wire size, part of the information from the ASTM E230 Standard
- Thermocouple Wire Color Codes: USA and Others Courtesy of ISE, Instrument Service & Equipment, Cleveland Ohio, USA.
- Standards for thermocouples and other temperature sensors.
- Calibration & Traceability Includes links to vendors of calibration equipment and services.
- How thermocouples work and notes on using them A great article by Prof. Moffat of Stanford University courtesy of Electronics Cooling Magazine.
- Thermocouple (TC) Specification CriteriaLinks to well done article on the Smart Sensors webpage plus a few added notes
- Introduction to and tons of downloads about thermocouples Including thermocouple tables, RTD tables and polynomials all in .pdf format – covers Thermocouples and much more, most of it very good stuff-From a big US manufacturer (Omega) that sometimes modifies its page links without notice!
- Sensor Scientific’s web site has comparison of four popular contact temperature sensor types: Thermocouples, Resistance, Thermistors and Semiconductor, shown on a one page chart in a very readable format.
- Thermocouple Suppliers A growing list of TC vendors around the world. Also visit TempSensor.net, The Temperature & Moisture Sensor Directories website, where TC and other temperature sensor vendors can enter their own listings of products and online resources at no charge.
- Miscellaneous Information
Thermocouples are used in many places with many things like indicators and controllers to do something useful, such as control a heating system to heat a product through a temperature-time profile that causes it to soften or cook or set or transform from a stressed condition to an annealed one or any number of physio-chemical changes that produce a desired end result. This page has a growing collection of Web sites offers a look at some of those things and places. - Thermocouple Applications
Information and resources on successful uses of thermocouples, some with more detail than others.
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