Explosion-proof heat resistance

Usually the explosion-proof resistance and display instrument, recording instrument, such as electronic computing systems.Directly measuring the production site of explosives, such as hydrocarbons - 200 ° C to 500 ° C range of liquid, steam and gas medium, as well as solid surface temperature.

Explosion-proof heat resistance characteristics
Compression spring type thermal components, ant-vibration performance is good.
High measuring accuracy;
Without compensation conductor, saves the cost;
Imported film resistance element, reliable, stable performance.
The working principle of the explosion-proof heat resistance
Flame-proof principle is to use the clearance, design has enough strength of the junction box, and other components, all will produce a spark, arc and dangerous parts are sealed in the junction box cavity temperature, when the explosion cavity, can remove from heat and cooling by joint clearance, the explosion flame temperature and not reach outside the cavity, flame-proof thereby.
Explosion-proof heat resistance is the main technical parameters
Product standards
IEC751
JB/T18622-1997
JB/T8623-1997
JB/T5518-91
The normal temperature insulation resistance
Explosion-proof heat resistance at ambient temperature for 15-35 ° C, relative humidity is not more than 80%, test voltage for 10-100 - v (dc) electrode and outer casing of the insulation resistance between > 100 m Ω.
Forensics schedule

Explosion-proof heat resistance measurement range and tolerance

Electrical equipment type

Class I -- -- -- -- -- - electrical equipments used in coal mine
Class II -- -- -- -- -- with electrical equipment factory
Explosion-proof grade
Explosion-proof heat resistance of explosion-proof grade according to its biggest security clearance used in explosive gas mixture is divided into A, B, C level 3.
Selection guidelines
1) type
2) dividing,
3) explosion-proof grade
4) precision grade
5) installation fixed form
6) protection tube material
7) length or insert depth
Example case A: explosion-proof heat resistance, Pt100 type, fixed screw M27 x 2, explosion-proof grade d Ⅱ BT4, protection tube, 316 insertion depth of 300 mm.WZP - 240, Pt100, L = 450 x 300, d Ⅱ BT4 temperature transmitter magnitude 0.5, protection tube, 316 thread M27 x 2