LRD-WAPJ Explosion-proof Resistance Temperature Detector

■ Features of Explosion-Proof Resistance Temperature Detectors

●Tension spring type temperature sensing element, excellent vibration resistance.

Wide measurement range;

● No compensation wire needed, saving costs;

● Imported thin-film resistor elements, reliable and stable performance.

■ Explosion-proof thermistor working principle

Explosion-proof thermistors utilize the gap-type explosion suppression principle. They are designed with components such as junction boxes that have sufficient strength. All parts that can generate sparks, arcs, or dangerous temperatures are sealed within the junction box cavity. In the event of an explosion inside the cavity, the fire can be extinguished and cooled through the gaps at the mating surfaces, preventing the flame and temperature from spreading outside the cavity, thereby enabling temperature measurement.

■ Main Technical Parameters of Explosion-proof Resistance Temperature Detectors

Product Execution Standard

    IEC751

    JB/T8622－1997

    JB/T9623－1997

    JB/T5518-91

Explosion-proof thermistor ambient temperature insulation resistance

Explosion-proof thermistors, operating within an environmental temperature range of 15～35°C, with a relative humidity not exceeding 80%, and tested at a voltage of 10～100V (DC), the insulation resistance between the electrode and the sheath tube is ≥100MΩ.m.

■ Temperature Measurement Range and Tolerance

● Temperature Measurement Range and Tolerance

Note: "t" represents the absolute temperature value of the actual temperature measurement of the thermosensitive element.

● Evidence Inventory Sheet

Note: NEPSI explosion-proof certification is provided by the National Explosion-Proof Supervision and Inspection Station for Instruments and Meters.

● Explosion-proof grouping form

Electrical Equipment Categories

Class I - Electrical Equipment for Coal Mine Underground Use

Class II - Industrial Electrical Equipment

○ Explosion-proof grade

Intrinsically Safe Thermocouples have explosion-proof grades divided into three levels: A, B, and C, based on their maximum safe gap for use in explosive gas mixtures.

○Temperature Category

The temperature classes of explosion-proof thermocouples are divided into T1 to T6 based on the maximum allowable surface temperature of their exposed parts.

● Explosion-proof grade
    ●EXd II□T□
    ●Exia II□T□
● Protection Level: IP65

■ Junction box style

● dⅡBT□ level ● dⅡCT□ level

■ Terminal Installation Type

■Model Naming Method

Selection Guidelines

Model

2) Tolerance grade

3) Explosion-proof rating

4) Precision Grade

5) Installation and Mounting Type

6) Pipe Protection Material

7) Length or Insertion Depth

Ex. A: Explosion-proof thermistor, Pt100 type, fixed thread M27×2, explosion-proof grade dⅡBT4, protective tube 316, insertion depth 300mm. ZK-WZP-240, Pt100, L=450×300, dⅡBT4 temperature transmitter 0.5 class, protective tube 316, thread M27×2.