Working principle of high-precision armored explosion-proof thermistor

Armored explosion-proof thermistorUsually used in conjunction with display instruments, recording instruments, electronic computing, etc. Directly measure the temperature of liquid, vapor, gas media, and solid surfaces within the range of -200 ° C to 500 ° C in the presence of hydrocarbons and other explosives on the production site.

Characteristics of WZP-240 PT100 Explosion proof Thermal Resistance:
·Pressure spring type temperature sensing element with good anti vibration performance;
·High measurement accuracy;
·No need to compensate for wires, saving costs;
·Imported thin film resistor components with reliable and stable performance.

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 from being transmitted outside the cavity, thus achieving explosion-proof.

Armored explosion-proof thermistorMain technical parameters:
WZP-240 PT100 Explosion proof Thermistor Product Execution Standard
IEC751
JB/T18622-1997
JB/T8623-1997
JB/T5518-91

Room temperature insulation resistance:
The thermal resistance is tested at 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 greater than 100M Ω.

Explosion proof level: Explosion proof certificate number certification agency d ∥ BT4 GYB96450 NEPSI d ∥ BT4 GYB96453 NEPSI d ∥ CT5 GYB98339 NEPSI d‖CT5 GYB97197 NEPSI ia‖CT6 GYB99412 NEPSI

Measurement range and tolerance:

Model division number, temperature measurement range, accuracy level, allowable error WZP Pt100-200-+500 * ± (0.15+0.002) ltl, B-level ± (0.30+0.005) ltl, WZC Cu50 Cu100-50-+100--- ± (0.30+0.005) ltl

WZP-240, WZP-440, WZP-241 Anhui Tiankang Tianyi Explosion proof Thermistor Explosion proof Grouping Form Explosion proof Thermistor
Electrical equipment type:
Class I - Electrical equipment for underground coal mines
Class II - Factory Electrical Equipment

WZP-240, WZP-440, WZP-241 Explosion proof level:
The explosion-proof level is divided into three levels: A, B, and C, based on the maximum safety clearance for use in explosive gas mixtures.

Category level maximum test safety gap (MESG) mm II A 0.9 ≤ MESG B 0.5C MESG≤0.5

Temperature group:
The temperature group of explosion-proof thermocouples is divided into T1-T6 according to the allowable maximum surface temperature of their exposed parts

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

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

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