Sanitary thermistor

We have been committed to developing and producing various pressure and temperature measuring instruments for special purposes. We can currently produce five major products including temperature, flow rate, pressure, material level, and valves. Our featured products include stainless steel anti-corrosion, shock resistance, micro pressure, differential pressure, various chemical seals and pressure sensors, pressure switches, electrical signal output, and nearly 20 series of products. Our products have thousands of varieties and a pressure measurement range of up to 250MPa and as small as 0.5kPa; The precision of mechanical precision meters can reach 0.25%, and the precision of electronic instruments can reach over 0.05%. These products are selected for domestic and multiple key projects, and provide excellent supporting services for multiple enterprises.

Sanitary thermistor

thermal resistor

Thermistor is a commonly used temperature detector in the medium and low temperature range. Its main features are high measurement accuracy and stable performance. The measurement accuracy of platinum resistance thermometer is the highest among them. It is not only widely used in industrial temperature measurement, but also made into a standard reference instrument.

Principle and Materials of Thermistor Temperature Measurement

Thermal resistance temperature measurement is based on the characteristic that the resistance value of metal conductors increases with temperature.

Thermistors are mostly made of pure metal materials, with platinum and copper being the most commonly used. In addition, materials such as Dian, nickel, manganese, and rhodium have begun to be used to manufacture thermistors. 、

Sanitary thermistor

The structure of thermal resistance

（1）Mastery 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. To eliminate the influence of lead resistance, a three wire or four wire system is generally used.

(2) Armored thermal resistance 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, and can be as small as 2mm.

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, and has a long service life.

(3) 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.

(4) Explosion proof thermoelectric barrier type 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.