Factory Supply Industrial Thermocouple Temperature Sensor for Heat Treatment Furnace

A thermocouple is the most commonly used temperature sensor. It utilizes the thermoelectric effect generated by the contact of two dissimilar metal conductors to convert temperature difference into voltage signals for measuring high and medium-low temperatures.

Weld one end of two metal wires of different compositions together to form the measuring hot junction, which attaches to the measured object for temperature detection. The other two separate ends serve as the reference cold junction kept at a known normal temperature.

When a temperature difference exists between the hot end and cold end, a weak thermoelectric potential (millivolt-level voltage) will be produced in the circuit. The greater the temperature difference, the higher the voltage.

The temperature meter calculates the actual temperature of the hot end by reading the voltage value.

1. Thermoelectrodes: Two different alloy wires, the core temperature measuring material

2. Hot Junction: Welding point of two metals that contacts the measured heat source

3. Insulating Sleeve: Separates the two electrodes to avoid short circuit

4. Protection Tube: High temperature resistant, corrosion resistant and wear resistant; materials include stainless steel, corundum ceramic, etc.

5. Terminal Box: Connects compensation wires and temperature controllers

Advantages

1. Extremely wide measuring range: available from -200℃ up to 1800℃

2. High temperature resistance, applicable for furnaces, heat treatment furnaces, boilers and industrial heating equipment

3. Simple structure and fast thermal response; can be made into thin probes for narrow-space measurement

4. Low cost, suitable for mass industrial temperature measurement

5. Supports long-distance signal transmission, matches temperature controllers for automatic temperature control

Disadvantages

1. Tiny output voltage, susceptible to electromagnetic interference

2. Ambient temperature fluctuation at cold junction causes measurement error, cold junction compensation is required

3. Lower low-temperature accuracy compared with PT100 thermal resistance

High-temperature measurement for industrial heat treatment furnaces (mesh belt furnaces, vacuum furnaces, annealing furnaces), kilns, injection molding machines, boilers, aluminum melting furnaces, drying ovens, power pipelines, metallurgical equipment, auto parts thermal processing equipment and more.

1. Thermocouple: For high temperature measurement, outputs voltage signals, types K/S/B/E/J/T

2. PT100 Thermal Resistance: For normal & low temperature (-200~600℃), works on resistance variation with higher measurement accuracy