Thermal resistance series

Description

Thermal resistor is the most commonly used temperature detector in the medium and low temperature range. Thermal resistance temperature measurement is based on the characteristic that the resistance value of metal conductors increases with temperature. Its main features are high measurement accuracy and stable performance. Among them, platinum resistance thermometer has the highest measurement accuracy. It is not only widely used in industrial temperature measurement, but also made into a standard reference instrument. Thermistors are mostly made of pure metal materials, with platinum and copper being the most commonly used. In addition, materials such as nickel, manganese, and rhodium have been used to manufacture thermistors. There are many types of temperature sensing materials commonly used in metal thermistors, with platinum wire being the most commonly used. In addition to platinum wire, there are also copper, nickel, iron, iron nickel and other metal thermistor materials used in industrial measurement.

Working principle: The temperature measurement principle of thermal resistance is based on the characteristic that the resistance value of a conductor or semiconductor changes with temperature to measure temperature and temperature related parameters. Thermistors are mostly made of pure metal materials, with platinum and copper being the most commonly used. Materials such as nickel, manganese, and rhodium have been used to manufacture thermistors. Thermistors typically require the transmission of resistance signals through leads to computer control devices or other secondary instruments

Main types:

Ordinary type thermistor

According to the temperature measurement principle of thermal resistance, the change in the measured temperature is directly measured by the change in the resistance value of the thermal resistance. Therefore, the change in resistance of various wires such as the lead wires of the thermal resistance body will have an impact on temperature measurement.

Armored thermistor

Armored thermistor is a solid body composed of temperature sensing elements (resistors), leads, insulation materials, and stainless steel sleeves. Its outer diameter is generally between 2 and 8mm, with a minimum of up to 8mm. Compared with ordinary thermistors, it has the following advantages:

1. Small size, no air gap inside, low measurement lag in terms of thermal inertia;

2. Good mechanical performance, vibration resistance, and impact resistance;

3. Can bend, easy to install;

4. Long service life.

End face thermistor

The end face thermistor temperature sensing element is made of specially processed resistance wire wound tightly against the end face of the thermometer. Compared with general axial resistance thermometers, it can more accurately and quickly reflect the actual temperature of the measured end face, and is suitable for measuring the end face temperature of bearing shells and other components.

Explosion proof thermistor

Explosion proof thermistor uses a special structure of junction box to confine the explosion of explosive mixed gas inside its shell caused by sparks or arcs within the junction box, so as not to cause excessive explosion in the production site. Explosion proof thermal resistors can be used for temperature measurement in areas with explosive hazards within Bla-B3c class zones.