Explosion-proof thermal resistance is one of the commonly used temperature sensors in industrial production, and is widely used in hazardous environments such as flammable and explosive due to its explosion-proof performance. This article will introduce the working principle, technical characteristics, selection basis and precautions for installation and use of explosion-proof thermal resistance, etc., to help readers better understand and apply this temperature sensor.
The working principle of explosion-proof thermal resistance.
Explosion-proof RTD is a temperature sensor based on the principle of metal RTD, which works by measuring the characteristics of the resistance of a metal conductor with temperature and converting the temperature change into an electrical signal output. Specifically, explosion-proof thermal resistance is composed of metal conductors, insulating materials, and protective sleeves, and when the temperature changes, the resistance value of the metal conductor changes, resulting in an electrical signal.
One: product application: It is usually used with display instruments, recording instruments, electronic computers, etc. Direct measurement of liquid, vapor and gaseous media and solid surface temperatures in the range of -200 500 for hydrocarbons and other ** substances present in various production sites. Ancillary products: PT100 leads.
2. Product features：1.Compression spring type temperature sensing element, good seismic performance; 2.High measurement accuracy; 3.There is no need to compensate for the wires, saving costs; 4.Imported thin-film resistive elements, reliable and stable performance;
Three: working principleFlameproof thermal resistance is the use of the principle of flame isolation of the material gap, the design of junction boxes and other components with sufficient strength, all the parts that will produce sparks, arcs and dangerous temperatures are sealed in the junction box cavity, when the cavity occurs, it can be extinguished and cooled through the gap of the joint surface, so that the flame and temperature can not be transmitted outside the cavity, so as to carry out flameproofing.
Four: technical parameters
1. Product standards: IEC751, JB T8622-1997, JB T8623-1997, JB T5518-1991
2. Insulation resistance at room temperature: the explosion-proof thermal resistance is 15 35 at ambient temperature, the relative humidity is not more than 80%, and the test voltage is 10 100V (DC) The insulation resistance between the electrode and the outer sleeve is 100m
3. Graduation number: PT100
4. Temperature measurement range: -200 +500
5. Accuracy grade: * 015+0.002LTL) Class B (0.30+0.005ltl）
6. Explosion-proof certification:
Explosion-proof level - explosion-proof certificate number - certification body.
dⅱbt4-gyb97152-nepsi
dⅱct5-gyb02476-nepsi
iaⅱct6-gyb05364x-nepsi
7. Thermal response time: 90s
8. Installation form: fixed flange.
9. Junction box form: explosion-proof junction box.
10. Diameter range: 16
11. Length range
12. The protective tube is 1Cr18Ni9Ti, and the rest of the materials are ordered according to the agreement;
13. Nominal pressure 25mpa
5. Precautions for installation and use
1.Installation location: The explosion-proof thermal resistance should be installed in a location that is easy to dissipate heat, free of magnetic field interference, and easy to maintain. At the same time, it should be avoided to be installed in locations that are prone to mechanical damage or high vibration.
2.Wiring: The wiring method of explosion-proof thermal resistance should be selected according to the actual needs, such as three-wire system, four-wire system, etc. When wiring, ensure that the terminal blocks are firmly connected to avoid poor contact or short circuit.
3.Protective measures: In the process of installation and use, corresponding protective measures should be taken, such as installing protective sleeves, waterproof measures, etc., to protect the explosion-proof thermal resistance from external factors.
4.Regular calibration: In order to ensure the accuracy and stability of the measurement, the explosion-proof thermal resistance should be calibrated and maintained regularly. Calibration and maintenance should follow relevant regulations and standards to ensure calibration and maintenance quality.
5.Safety precautions: During installation and use, relevant safety regulations and standards should be strictly adhered to to ensure personnel safety and equipment safety. If any abnormalities are found during use, they should be dealt with and reported in a timely manner.
To sum up, explosion-proof thermal resistance has been widely used in industrial production as a temperature sensor with explosion-proof performance. Understanding its working principle, technical characteristics, selection basis and precautions for installation and use will help to better apply this temperature sensor and improve the safety and stability of industrial production.