1. Application of explosion-proof thermal resistance

Explosion-proof thermal resistance is usually used in conjunction with display instruments, recording instruments, electronic calculations, etc. Directly measure the surface temperature of liquid, vapor and gas medium and solid surface in the range of -200°C~500°C where there are explosives such as hydrocarbons at the production site

2. Features of explosion-proof thermal resistance

　　• Compression spring type temperature sensing element, good anti-vibration performance;
　　• High measurement accuracy;
　　• No need to compensate the wire, saving cost;
　　•Imported thin-film resistor elements with stable performance.

3. The working principle of explosion-proof thermal resistance

Explosion-proof thermal resistance uses the principle of gap explosion-proof to design components such as junction boxes with sufficient strength. The parts that generate sparks, arcs and dangerous temperatures are sealed in the cavity of the junction box. When an explosion occurs in the cavity, the flame can be extinguished and cooled through the gap of the joint surface, so that the flame and temperature after the explosion can not be transmitted to the outside of the junction box cavity, thereby performing an isolated explosion.

4. The main technical parameters of explosion-proof thermal resistance

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

5. Insulation resistance at room temperature

The temperature of the thermal resistance is 15-35°C, 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 tube>100MΩ.

6. Certification of explosion-proof thermal resistance

Explosion-proof level	Explosion-proof certificate number	Certification body
d‖BT4	GYB96450	NEPSI
d‖BT4	GYB96453	NEPSI
d‖CT5	GYB98339	NEPSI
d‖CT5	GYB97197	NEPSI
ia‖CT6	GYB99412	NEPSI

7. Measuring range and tolerance

Model number	Index number	Temperature range	Accuracy class	Allowable error
WZP	Pt100	-200-+500	Class A	±(0.15+0.002) ltl
			Class B	±(0.30+0.005) ltl
WZC	Cu50  Cu100	-50-+100	---	±(0.30+0.005) ltl

8. Grouping form of explosion-proof thermal resistance

Classification of explosion-proof thermal resistance

9. Types of electrical equipment

    Class I------Electrical equipment for underground coal mines
    Class II-Electrical Equipment for Factory

10. Explosion-proof grade of explosion-proof thermal resistance

The explosion-proof grades of explosion-proof thermocouples are divided into three grades A, B, and C according to the maximum safety gap used in explosive gas mixtures.

Category	Level	Maximum test safety gap (MESG) mm
II	A	0.9≤MESG
	B	0.5<MESG<0.9
	C	MESG≤0.5

11. Temperature classification of explosion-proof thermal resistance

The temperature group of explosion-proof thermocouple is divided into T1-T6 according to the maximum allowable surface temperature of its exposed part
Temperature

Temperature group	Allowable maximum surface temperature ℃
T1	450
T2	300
T3	200
T4	135
T5	100
T6	85

12. Explosion-proof level of explosion-proof thermal resistance      

  EXdII□T□
  EXiaII□T□
Protection level: IP65

13. Junction box of explosion-proof thermal resistance

14. Installation terminal of explosion-proof thermal resistance


15. Model naming of explosion-proof thermal resistance

16. Selection table of explosion-proof thermocouple

Active pipe joint type explosion-proof thermal resistance, selection table	Straight pipe joint type explosion-proof thermal resistance, selection table
Fixed threaded pipe joint type explosion-proof thermal resistance, selection table	Movable threaded pipe joint type explosion-proof thermal resistance, selection table