face thermal resistor

WZ series end face thermistor

1thermal resistorTemperature measurement principle and materials

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

2Types of Thermal Resistors

1) Ordinary type thermistor

According to the temperature measurement principle of thermal resistance, the change in the measured temperature is directly measured through 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.

2）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, and can be as small as 8mm. Compared to the regular typethermal resistorCompared to it, it has the following advantages: ① Small size, no interiorAir gap，thermal inertiaUp, the measurement lag is small; ② Good mechanical performance, vibration resistance, and impact resistance; ③ Can bend, easy to install, and has a long service life.

3）face thermal resistor

The temperature sensing element is specially processedresistance wireMaterial wrapping.

4) Explosion proof thermistor

Explosion proof thermistor uses a specially designed junction box to expose the explosive gas mixture inside its casing to sparks orelectric arcThe explosion caused by the impact is limited to the junction box, and the production site will not trigger an explosion. Explosion proof thermal resistors can be used for temperature measurement in areas with explosive hazards within Bla-B3c class zones.

How does the resistance change

The resistance value can change, so many people rely on this for industrial measurement. However, there are still many people who are not very familiar with the process of resistance value change. Let's explain it below.

It is a temperature sensor that converts temperature into resistance based on the principle that its resistance value changes with temperature.Temperature Transmitter、Temperature Controller、 Temperature measuring devices such as PLC templates are applied with a known excitationcurrent measurementThe method of obtaining the resistance value through the voltage at both ends, and then converting the resistance value into a temperature value, thus achievingtemperature measurementTemperature measuring devices generally have four input wiring terminals. The I+and I - terminals provide constant current, while V+and V - are used for detectionvoltage variationAnd use this to detect temperature changes.

Used for weakly corrosive media such as industrial water, domestic water, sewage, etc., suitable for industrial sectors such as petroleum, chemical, steel, as well as municipal and environmental protection fields. Alloy B protective tube: It has good corrosion resistance to all concentrations of hydrochloric acid below boiling point, as well as to non chlorinated acids, bases, and non oxidizing salt solutions such as sulfuric acid, phosphoric acid, and organic acids. Alloy C protective tube: able to withstand non corrosive substancesOxidizing acid, such asnitric acid、Mixed acid, orchromic acidCorrosion in mixed media with sulfuric acid, as well as corrosion resistance to oxidizing salts such as Fe++, Cu++, or other oxidants, such as those above room temperatureHypochlorite saltCorrosion of solutions and seawater. Titanium protective tube: capable of withstanding corrosion from seawater, various chlorides and hypochlorites, oxidizing acids, organic acids, and alkalis. Not resistant to purer onesreducing propertyCorrosion caused by acid, but if the acid contains oxidants, the corrosion is greatly reduced.

PolytetrafluoroethyleneProtective tube: Yeschemical propertiesA type of plastic that can withstand boiling hydrochloric acid, sulfuric acid, nitric acid, andaqua regiaIt can also withstand concentrated alkali and various organic solvents. Not durableChlorine trifluorideHigh temperature chlorine trifluoride, high speedLiquid fluorineCorrosion caused by liquid oxygen and ozone.