Explosion-proof distribution box for liquid level gauge

Explosion-proof power distribution boxes safely supply power to liquid level gauges in hazardous environments, meeting ATEX and IECEx standards for Zone 1/2 gas and Zone 21/22 dust areas.

Overview

An explosion-proof power distribution box is a rugged enclosure designed to prevent sparks or heat from igniting flammable gases, vapors, or dust in hazardous areas. These boxes are essential when powering liquid level gauges, such as ultrasonic, radar, or hydrostatic transmitters, in environments like oil refineries, chemical plants, or storage tanks.

Key Features

Certification: Most boxes are ATEX and IECEx certified, suitable for Zone 1/2 gas (IIA-IIC) and Zone 21/22 dust environments. Construction: Materials include stainless steel, carbon steel, or fiberglass-reinforced polyester, often with anti-corrosion coatings for durability in harsh conditions. Current Capacity: Models vary; for example, CE92 boxes support a maximum main current of 180A and branch circuits up to 100A, while SEM series can handle up to 630A main and 400A branch circuits.

Safety Design: Dual-structure safety features, such as flameproof switchgear and increased-safety busbars, ensure reliable operation in explosive atmospheres.

Multi-

Circuit Chambers: Some enclosures allow integrated multi-circuit distribution, simplifying wiring for multiple level transmitters or other instrumentation. Compatibility with Liquid Level GaugesExplosion-proof boxes are compatible with ultrasonic, radar, and hydrostatic level transmitters. For instance, the EchoSafe XP88-89 ultrasonic level transmitter provides continuous level measurement in hazardous areas and can be powered safely through an explosion-proof distribution box.

These transmitters often output 4-20 mA signals and are configurable via push-button displays or PC software, making them suitable for integration with industrial control systems.

Selection Considerations

When choosing a distribution box for liquid level gauges: Hazard Zone Classification: Ensure the box matches the zone rating of the installation (Zone 1/2 gas or Zone 21/22 dust). Current Requirements: Verify the main and branch circuit ratings meet the power needs of all connected devices. Material and Corrosion Resistance: Select materials compatible with the process environment (e.g., chemical exposure, moisture).

Number of Circuits: Consider multi-circuit enclosures if multiple transmitters or sensors are installed. Integration: Confirm compatibility with the transmitter's power supply and signal output requirements.

Conclusion

Using an explosion-proof power distribution box ensures safe and reliable operation of liquid level gauges in hazardous environments. Certified enclosures like CE92, SEM series, or Hexlon boxes provide robust protection, high current capacity, and compliance with international safety standards, making them ideal for industrial applications where flammable liquids or gases are present.