What is the optimal length of the Thermocouple wire
Table of Contents
Overview
The Thermocouple wire is used in a Thermocouple from the point of sensing (probe) to the point of cold junction compensation (cjc end), where the signal is measured (Roasting Intelligence hardware). Different thermocouple types (e.g., J, K, T, E, etc) use different mixtures of metals in the wire. This article will introduce the optimal length of the Thermocouple wire for accurate temperature measurements in industrial applications.
The following information is based on the OMEGA technical reference page.
Other vendors may have different specifications for maximum lengths.
FAQS
What is the difference between Thermocouple grade and Extension grade wire?
Thermocouple grade wire is wire that is used to make the sensing point (or probe part) of the thermocouple. Extension grade wire is only used to extend a thermocouple signal from a probe back to the instrument reading the signal.
What is the maximum length of thermocouple wire?
Many factors can impact the usable length of a thermocouple.
As a guideline, under 100 feet (~ 30 meters) with 20 AWG (American Wire Gauge) or thicker wire in an area free of electromagnetic interference usually is fine.
💡 Tips and Recommendations:
Take a look at the AWG to metric conversion chart.
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