Armored thermocouple - excellent interchangeability and accuracy

There are two types of structures for armored thermocouples: ordinary type and armored type. Ordinary thermocouples generally consist of thermal electrodes, junction boxes, protective sleeves, and insulating tubes. Armored thermocouples are a solid combination of insulation materials, thermocouple wires, and metal protective sleeves that are assembled and stretched through processing.
However, the electrical signal of a thermocouple requires a special type of wire for transmission, which we refer to as a compensating wire. Different thermocouples require different compensation wires, and their main function is to connect with the thermocouple, keeping the reference end of the thermocouple away from the power source, thereby stabilizing the temperature of the reference end.
Compensation wires are divided into two types: compensation type and extension type. The chemical composition of the extension wire is the same as that of the compensated thermocouple. However, in practice, the extension wire is not made of the same material as the thermocouple, and is generally replaced by a wire with the same electron density as the thermocouple. The connection between the compensating wire and the thermocouple is generally very clear. The positive pole of the thermocouple is connected to the red wire of the compensating wire, while the negative pole is connected to the remaining color. Most compensation wires are made of copper nickel alloy.
Although explosion-proof thermocouples are widely used in industry, their application is limited due to their temperature measurement range. The temperature measurement principle of thermal resistance is based on the characteristic that the resistance value of a conductor or semiconductor changes with temperature. It has many advantages, such as the ability to transmit electrical signals remotely, high sensitivity, strong stability, good interchangeability, and accuracy. However, it requires power excitation and cannot instantly measure temperature changes inside.
Industrial thermistors generally use Pt100, Pt10, Cu50, and Cu100. The temperature measurement range of platinum thermistors is generally -200 to 800 degrees Celsius, while copper thermistors are -40 to 140 degrees Celsius. A thermistor has the same distinguishing type as a thermocouple, but it does not require compensating wires and is cheaper than a thermocouple.