One product overview

Explosion proof thermistor is used as a sensor and display instrument for temperature measurement and control, to directly measure and control the temperature of gases, liquids, and vapors during the process. The explosion-proof performance of the chemical special explosion-proof thermistor and explosion-proof thermocouple products is designed and manufactured according to the national standard of "Explosion proof Electrical Equipment for Explosive Environments". The thermoelectric characteristics comply with international IEC standards and have been tested and qualified by the National Instrument Explosion proof Safety Supervision Station The structure, principle, and assembly method of explosion-proof thermocouples and explosion-proof thermistors are basically the same. The main difference is that the explosion-proof product junction box (housing) is designed with high-strength aluminum alloy die-casting, and has sufficient internal space, wall thickness, and mechanical strength. The thermal stability of the rubber sealing ring meets national explosion-proof standards. So when the explosive gas mixture inside the junction box explodes, its internal pressure will not damage the junction box, and the resulting heat energy cannot diffuse outward - the explosion cannot be transmitted As long as users strictly follow the product usage rules, explosion-proof thermistor products can achieve reliable explosion-proof effects.

II characteristic:
Pressure spring type temperature sensing element with good anti vibration performance;
High degree;
No need to compensate for wires, saving costs;
Imported thin film resistor components with reliable and stable performance.

III working principle:
Explosion proof thermistor utilizes the principle of gap explosion-proof to design junction boxes and other components with sufficient strength. All components that can generate sparks, arcs, and dangerous temperatures are sealed inside the junction box cavity. When an explosion occurs inside the cavity, it can be extinguished and cooled through the gap between the joint surfaces, preventing the flame and temperature after the explosion from being transmitted outside the cavity, thus achieving explosion-proof.

4 Main technical parameters:

Product execution standards
IEC751 JB/T18622-1997 JB/T8623-1997 JB/T5518-91

Room temperature insulation resistance
Explosion proof thermistor with an ambient temperature of 15-35 ° C, relative humidity not exceeding 80%, and a test voltage of 10-100V (DC). The insulation resistance between the electrode and the outer sleeve is › 100M Ω.

Measurement range and tolerance

Five Model naming convention

Selection Notice

1) Model number
2) Dividing number
3) Explosion proof grade
4) Accuracy level
5) Installation fixed form
6) Material of protective tube
7) Length or insertion depth
Example A: Explosion proof thermistor, Pt100 type, fixed thread M27 × 2, explosion-proof grade dIIBT4, protective tube 316, insertion depth 300mm. Model WZP-240, Pt100, dIIBT4, thread M27 × 2, protective tube 316, L=450 × 300mm.