In chemical plants, the production site is accompanied by various flammable, explosive and other chemical gases and vapors. The use of ordinary thermocouples is very unsafe and can easily cause environmental gas explosions. 为温度传感器。 In these cases, a flameproof thermocouple must be used as the temperature sensor. The so-called flameproof type means that the shell can withstand the explosive pressure of the explosive gas mixture inside, and prevent the internal explosion from propagating to the explosive mixture around the shell. The structure of the flameproof thermocouple and the ordinary thermocouple is basically the same, the difference is: flameproof products The design of the junction box adopts a special explosion-proof structure. The junction box is die-cast from high-strength aluminum alloy, and has sufficient internal space, wall thickness and mechanical strength. The thermal stability of the rubber seal ring meets national explosion-proof standards. Therefore, when the explosive mixed gas inside the Qin junction box explodes, its internal pressure will also damage the junction box, and the heat generated by it cannot be diffused outward. Explosion-proof thermocouples have explosion-proof function. Suitable for production sites where flammable and explosive compounds are present, and multiple locations or multiple measurements of locations must be measured simultaneously. Widely used in petrochemical distillation tower equipment.
The main technical parameters
Electrical outlet: M20x1.5NPTI1 / 2
Thermal response time: ≤8S
Even wire diameter: Ф1. Ф2. Ф3
Protection level: IP65
Flameproof rating: d‖BT4.d‖CT5
Industrial explosion-proof thermocouples are used as temperature measurement and control sensors and display instruments to directly measure and control the temperature of gas, liquid and steam in the production process. 产品防爆性能按国家颁布的“爆炸性环境用防爆电器设备"标准设计制造，热电特性符合国际IEC标准，并经国家仪器仪表防爆安全监督站测试合格.隔爆热电偶的结构、原理与装配方式基本相同，主要区别是隔爆产品接线盒(外壳)在设计上采用高强度铝合金压铸而成，并具有足够的内部空间，壁厚和机械强度，橡胶密封圈的热稳定性均符合国家防爆标准。 The explosion-proof performance of the explosion-proof thermocouple products for chemical industry produced by our factory is designed and manufactured in accordance with the "explosion-proof electrical equipment for explosive environments" issued by the country. The thermoelectric characteristics conform to international IEC standards and passed the test of the national instrumentation explosion-proof safety supervision station. The structure, principle and assembly method of the thermocouple are basically the same. The main difference is that the explosion-proof product junction box (shell) is designed by die-casting high-strength aluminum alloy, and has sufficient internal space, wall thickness and mechanical strength, and rubber seal. The thermal stability of the ring meets national explosion-proof standards. Therefore, when the explosive mixed gas inside the junction box explodes, its internal pressure will not damage the junction box, and the thermal energy generated by it will not be able to diffuse outward--transmission explosion. As long as the user strictly adheres to the product usage rules, the product can achieve a reliable explosion-proof effect. It is designed according to the latest explosion-proof specifications GB3836 in compliance with international IEC standards. Adopting two-chamber flameproof structure, it is easy to replace the temperature measuring element, and it is safe and reliable to use. Explosion-proof mark dⅡBT4 is suitable for temperature measurement in places with IIB or below, ignition temperature above T4, and places containing explosive gas. Explosion-proof mark dⅡBT4, iaⅡCT4, suitable for temperature measurement below Class Ⅱ, ignition temperature above T4, and explosive gas.
Explosion-proof thermocouples are designed to make use of the gap explosion-proof principle. They have sufficient strength for the junction box and other components. All parts that produce sparks, arcs and dangerous temperatures are sealed in the junction box cavity. When an explosion occurs in the cavity, it can pass through. The gap between the joint surface is extinguished and cooled, so that the flame and temperature after the explosion can not be transmitted outside the cavity, so as to isolate the explosion. 是一种温度传感器，隔爆热电偶在化学工业自控系统中应用极广，隔爆热电偶通过温度传感器， 可将控制对象的温度参数变成电信号，传递给显示、记录和调节仪，对系统施行检测、 调节和控制。 Explosion-proof thermocouple is a kind of temperature sensor. Explosion-proof thermocouple is widely used in the chemical industry automatic control system. Through the temperature sensor, the flame-proof thermocouple can change the temperature parameter of the control object into an electrical signal, which is transmitted to the display, record and Regulators perform detection, adjustment, and control of the system. In chemical plants, the production site is often accompanied by various flammable and explosive chemical gases and steam. If ordinary thermocouples are used, it is very unsafe and can easily cause environmental gas explosion. Therefore, explosion-proof thermocouples must be used as temperature sensors in these occasions. The explosion-proof thermocouple products produced by our company are suitable for use in places with explosive gas dangers in the dⅡCT6 temperature group interval.
If a closed loop is composed of two homogeneous conductors (hot electrodes) of different components, and there is a current in the loop when there is a temperature gradient at both ends, then there is a thermoelectric explosion-proof principle between the two ends:
Utilizing the gap explosion isolation principle, design the junction box and other components with sufficient strength, and seal all the components that will produce sparks, arcs and dangerous temperatures in the junction box. When an explosion occurs in the cavity, it can be extinguished through the gap of the joint surface and Cooling so that the flame and temperature after the explosion do not pass to the outside of the cavity. Features:
Designed according to the latest explosion-proof regulations GB3836 in compliance with international IEC standards;
Adopting a two-cavity flameproof structure, the temperature measuring element is easy to replace, and the safe and reliable flameproof mark dⅡCT6 is used, which is suitable for temperature measurement under the level of IIC, the ignition temperature above T6, and the presence of explosive gases.
Please cut off the power during maintenance. Main technical parameters: The thermocouple is at an ambient temperature of 20 ± 15 ° C, the relative humidity is not greater than 80%, and the test voltage is 500 ± 50V (DC). The insulation resistance between the electrode and the outer sleeve is> 1000Ω. m