technical data

Socket typethermal resistanceDetailed explanation of

Socket typethermal resistanceAlso known as socket type platinumthermal resistance. Socket typethermal resistanceTemperature measurement is based on the characteristic that the resistance value of metal conductors increases with temperature.thermal resistanceMost of them are made of pure metal materials, and currently the most commonly used are platinum and copper in the form of connectors, which are easy to install. Socket type platinumthermal resistanceThe component is made of platinum wrapped in micro ceramic tubes and holesthermal resistanceThe wire spun coil is used to make temperature sensing elements, which are made quite small (the minimum outer diameter can be achieved as Ø 1.6 ～ Ø 1.2mm). It is used to make various miniature temperature sensor probes. Adopting a plug-in form, easy to install. Suitable for measuring temperature of liquid, gas, and solid surfaces within the range of -200 to+450 ℃.

WZP-260 WZP-270 WZP-280 series socket typethermal resistanceProduce according to the new Chinese standard JB/T8622-1997. Its working principle is that the resistance value of platinum resistance wire changes with temperature under the action of temperature. The relationship between temperature and resistance is close to a linear relationship, with minimal deviation and negligible deviation over time, and stable electrical performance. This series of products has the advantages of small structure, wide range of use, good reliability, and short thermal response time. It can form a series of products with multiple varieties and specifications, providing a new generation of high-quality products for the petroleum, chemical, power station, metallurgy, light industry, food, textile, medical and health, scientific research, agriculture, and machinery industries.

Main technical parameters

Accuracy level: A, B

Protection level: IP65

Nominal pressure: atmospheric pressure

Model and specifications

Socket typethermal resistanceIt's armorthermal resistanceThe extended product is more suitable for armorthermal resistanceSuitable for measuring temperatures between -50~400 ℃ in situations where installation is inconvenient.

Connection

thermal resistanceIt is a primary component that converts temperature changes into resistance value changes, usually requiring the resistance signal to be transmitted to a computer control device or other primary instrument through leads. industrialthermal resistanceInstalled on the production site, there is a certain distance between it and the control room, thereforethermal resistanceThe lead wire will have a significant impact on the measurement results.

currentlythermal resistanceThere are three main ways to lead wires

1two-wire system: Inthermal resistanceThe method of connecting a wire to each end of the wire to extract a resistance signal is called two-wire system: this lead method is simple, but due to the inevitable lead resistance r in connecting the wire, the size of r is related to the material and length of the wire, so this lead method is only suitable for situations with low measurement accuracy

2Three-wire: Inthermal resistanceThe method of connecting one end of the root to a lead and the other end to two leads is called the three wire system. This method is usually used in conjunction with an electric bridge to effectively eliminate the influence of lead resistance and is the most commonly used in industrial process control.

3four-wire system: Inthermal resistanceThe method of connecting two wires at each end of the root is called a four wire system, where the two leads arethermal resistanceProvide a constant current I, convert R into a voltage signal U, and then lead U to the secondary instrument through two other leads. It can be seen that this lead method can completely eliminate the influence of lead resistance and is mainly used for high-precision temperature detection.

thermal resistanceAdopting a three wire connection method. The use of a three wire system is to eliminate measurement errors caused by the resistance of connecting wires. This is because of the measurementthermal resistanceThe circuit is usually an unbalanced bridge.thermal resistanceAs a bridge arm resistor of the bridge, its connecting wires (from)thermal resistanceThe resistance in the central control room also becomes a part of the bridge arm resistance, which is unknown and varies with the ambient temperature, causing measurement errors. Using a three wire system, connect one wire to the power supply end of the bridge, and connect the other two wires separatelythermal resistanceOn the bridge arm and adjacent bridge arms, this eliminates measurement errors caused by wire line resistance.

Structural characteristics

（1）Proficient typethermal resistance: Commonly used in industrythermal resistanceThe structure and characteristics of temperature sensing elements (resistors). followthermal resistanceAccording to the principle of temperature measurement, the change in the measured temperature is directly transmitted throughthermal resistanceThe change in resistance is measured, therefore,thermal resistanceThe changes in the resistance of various wires such as the body's lead wires can have an impact on temperature measurement. To eliminate the influence of lead resistance, a three wire or four wire system is generally used.

（2）Armorthermal resistance: Armorthermal resistanceIt 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 to the regular typethermal resistanceCompared to others, 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.

（3）End facethermal resistance: End facethermal resistanceThe temperature sensing element is wound with specially treated resistance wire and tightly attached to the end face of the thermometer. It is different from the general axial directionthermal resistanceCompared to others, it can more accurately and quickly reflect the actual temperature of the measured end face, making it suitable for measuring the end face temperature of bearing shells and other components.

（4）Explosion proof typethermal resistance: Explosion proof typethermal resistanceBy using a special structure of the junction box, the explosion of explosive mixed gases inside its shell caused by sparks or arcs is confined within the junction box, and the production site will not cause an explosion. Explosion proof typethermal resistanceCan be used for temperature measurement in explosive hazardous areas within Bla~B3c level zones.