Among them, the measurement accuracy of platinum thermal resistance is very high. It is not only widely used in industrial temperature measurement, but also made into a standard reference instrument. The temperature sensor thermal resistance is a kind of temperature detector commonly used in the medium and low temperature area. Its main features are high measurement accuracy and stable performance.
1. The principle and material of temperature sensor thermal resistance temperature measurement
Temperature sensor thermal resistors are mostly made of pure metal materials. At present, platinum and copper are widely used. In addition, materials such as dian, nickel, manganese and rhodium have been used to manufacture temperature sensor thermal resistors.
The temperature sensor thermal resistance temperature measurement is based on the characteristic that the resistance value of the metal conductor increases with the increase in temperature for temperature measurement.
2. The structure of the thermal resistance of the temperature sensor
Application principle of proficient temperature sensor thermal resistance temperature sensor thermal resistance
Therefore, changes in the resistance of various wires such as the lead wires of the temperature sensor thermal resistance body will affect the temperature measurement.
It can be known from the temperature measurement principle of the temperature sensor thermal resistance that the change of the measured temperature is directly measured by the change of the resistance value of the temperature sensor thermal resistance.
3. Thermal resistance of armored temperature sensor
Temperature sensor thermal resistance temperature measurement system generally consists of temperature sensor thermal resistance, connecting wire (also called compensation wire) and display instrument.
Compared with ordinary temperature sensor thermal resistance, it has the following advantages: ①Small size, no internal air gap, thermal inertia, small measurement lag; ②Good mechanical performance, vibration resistance, impact resistance; ③Bendable, easy to install ④Use long life.
The thermal resistance of the armored temperature sensor is a solid body composed of temperature sensing elements (resistors), lead wires, insulating materials, and stainless steel sleeves. Its outer diameter is generally φ2~φ8mm, and the smaller can reach φ0.25mm.
Platinum resistance Pt100 -200~600℃ Class A: ±(0.15+0.002∣t∣) ±0.06
Class B: ±(0.30+0.005∣t∣) ±0.12
Copper resistance Cu50 -50~150℃ ±(0.30+0.006∣t∣) ±0.12
Cu100 ±0.10
4. Thermal resistance of end face temperature sensor
Compared with the thermal resistance of general axial temperature sensors, it can reflect the actual temperature of the measured end surface more accurately and quickly, and is suitable for measuring the end surface temperature of bearing bushes and other parts.
The thermal resistance temperature sensing element of the end face temperature sensor is wound by a specially processed resistance wire material, and is closely attached to the end face of the thermometer.
5. Explosion-proof temperature sensor thermal resistance
Explosion-proof temperature sensor thermal resistance can be used for temperature measurement in Bla~B3c zone with explosion hazard.
Explosion-proof temperature sensor thermal resistance confines the explosion of explosive mixed gas inside the shell due to the influence of sparks or arcs to the junction box through the junction box of special structure, and the production site will not cause excessive explosion. For the composition of the temperature sensor thermal resistance temperature measurement system, it must be noted that the graduation numbers of the temperature sensor thermal resistance and the digital display must be consistent.
