Product Description: Scope of Application for Positive Pressure Explosion proof Instruments, Distribution Panels, Cabinets, and Boxes
1. Explosive gas environment: Zone 1, Zone 2
2. Dangerous gases or vapors in the workplace: IIA、IIB、IIC
3. Temperature group: T1～T4
4. Environmental temperature:- 20℃～+40℃
5. Indoor and outdoor
Main technical parameters of explosion-proof positive pressure cabinet
1. Explosion proof mark: Expdem II BT4 Expdem II CT6 2、 Protection level IP54 (up to IP56)
3. The power supply inside the cabinet is 220VAC ± 10%, 50-60HZ, 10A
4. Input gas source: 0.4-0.8MPa, purified air or nitrogen and other protective gases
5. The air inlet is: G1/2 6、 Ventilation rate: 10-20m3/h
7. Ventilation time: 10-30 minutes (determined by the explosion-proof testing unit, tp=5 × V/Q, tp： Ventilation time, V: Net capacity inside the main cavity, Q: Flow rate of protective gas
8. The gas consumption is 2-8m3/h (depending on the volume of the panel and cabinet, the number of panel operating components, and their sealing degree)
9. Functional indicators:
a) Before supplying power to instruments and electrical appliances, press the start button to automatically ventilate the remaining air in the panel and cabinet. After the ventilation is completed, the positive pressure value will be automatically maintained at 250Pa ± 100Pa, and power can be supplied to the instruments and electrical appliances in the panel and cabinet
b) The working positive pressure value inside the panel and cabinet is 250Pa ± 100Pa
c) When the internal positive pressure value is less than 150Pa, it automatically replenishes air
d) When the internal positive pressure value is less than 80Pa, an automatic sound and light alarm will be triggered
e) When the internal positive pressure value is less than 50Pa, the power supply will be automatically cut off (please specify if this function is required for use in Zone 2 hazardous areas)
