Difference between thermal resistors and thermocouples
Thread Content
Experts, can we tell from the appearance of this image whether it is a thermal resistor or a thermocouple?
It cannot be determined just by looking at the appearance; one needs to check the label and the wiring, and measurement is required
Check the brand name; if not available, check the temperature reading and the wiring. The distinction is simple as long as you understand the principle.
It’s impossible to tell just by looking at the photos, unless you are familiar with this manufacturing process. What medium does this pipeline carry?
Thermocouples have two wires, while thermal resistors have three wires; their measurement principles are different
But once you see the brand name, it’s clear at a glance.
What is the temperature reading you’re getting? If it’s over 500°C, it must be a thermocouple. Also, check whether the rating is indicated on the nameplate; another thing to look at is the wires inside – in the case of thermal resistors, there are usually two identical wires and one different wire
Well, it’s definitely impossible to tell from the appearance photos! When making connections, one cannot rely solely on judgment; thermocouples come in a 2-wire type for single elements and a 4-wire type for dual elements ； Thermal resistors come in single-unit 3-wire type, single-unit 4-wire type, and dual-unit 6-wire type ； You need to consider your measurement range: thermal resistors are generally used to measure media with lower temperatures, while thermocouples are used for media with higher temperatures.
Judging from the installation pipeline, it should be a thermal resistor.
The blue one is the compensation cable, right? Then that must be the thermocouple.