Distinguish between thermocouples and thermal resistors

It can be distinguished from the outlet wires. Thermocouples are all two-wire systems, while thermal resistors are generally three-wire or four-wire systems.

The main difference between thermal resistors and thermocouples is the temperature measurement range. The main temperature measurement range of the thermal resistor is PT100 -200~420 degrees Celsius CU50 -150~100 degrees Celsius. The main temperature measurement range of the thermocouple is: Platinum rhodium 10-platinum graduation number S 0~1300 degrees Celsius platinum rhodium 13-platinum graduation number R 0~1300 degrees Celsius platinum rhodium 30-platinum rhodium 6 graduation number B 0~1600 degrees Celsius nickel-chromium-nickel silicon graduation number K 0~1200 degrees Celsius

The temperature measurement range can also be distinguished. The thermocouple measures high temperature and the thermal resistance measures low temperature.

The difference between thermocouples and thermal resistors. The similarities between thermocouples and thermal resistors are:: They are all sensors that measure temperature, also called primary meters. The difference is that: 1. As a temperature sensor, a thermocouple outputs an electric potential corresponding to the temperature, which is mostly a millivolt signal. Thermocouples made of different metal materials will output different potentials at the same temperature. For example, a thermocouple made of platinum-rhodium-platinum wire, which we call S-grading, outputs 0mv at 0 degrees, 9.585mv at 1000 degrees, and 16.771mv at 1600 degrees (when the ambient temperature is 0 degrees). If a thermocouple is made of nickel-chromium-nickel silicon wire, we call it K graduation. It outputs 0mv at 0 degrees, 39.816mv at 1000 degrees, and 50.950mv at 1300 degrees (the ambient temperature is 0 degrees). Thermocouples are generally used to measure the temperature of a "point". Choose thermocouples of different materials according to different high and low temperatures and other requirements. The name of the thermocouple means that its resistance changes with temperature changes. For example, it uses platinum wire with good linearity. ； Resistor made of copper wire. For example, a thermal resistor made of copper wire has a graduation number of Cu50. Its resistance is 50 ohms at 0 degrees and 71.400 ohms at 100 degrees. For example, the thermal resistance made of platinum wire is called Pt100. Its resistance is 100 ohms at 0 degrees, 18.52 ohms at minus 200 degrees, 175.86 ohms at 200 degrees, and 375.70 ohms at 800 degrees.

Judging from the nameplate of the temperature measuring element, the one whose graduation number is a capital letter is a thermocouple, and the one whose graduation number is a letter plus a number is a thermal resistor.

First, look at the name brand, and second, use a multimeter to measure the resistance.

Reply to the 4th floor, we cannot generalize like this. For example, the T-type thermocouple has stable performance and a temperature measurement range of -270~400°C. It is especially suitable for use at -200~0°C and has better stability. This post was last edited by ZZD109 on 2009-4-15 10:25 ]