UNOX Ex-Proof Limit Switch Box

Ex-Proof Limit Switch Box (Explosion-Proof Valve Position Indicator)

The Ex-Proof Limit Switch Box is specifically designed for valve position monitoring in hazardous and explosive environments where safety, reliability, and compliance with international standards are critical. It provides precise open/close feedback for automated valve systems installed in Zone 1 and Zone 2 classified areas, making it ideal for high-risk industrial applications.

UNOX Ex-Proof Limit Switch Boxes are commonly mounted on pneumatic actuators controlling quarter-turn valves such as ball valves, butterfly valves, and plug valves. The unit detects actuator movement and converts it into electrical signals that are transmitted to control systems including PLC, DCS, and SCADA, ensuring safe and accurate process control.

The enclosure is manufactured from heavy-duty aluminum alloy or stainless steel, engineered to withstand internal explosions without transmitting ignition to the surrounding atmosphere. Certified according to ATEX and IECEx standards, the housing provides superior protection against flame propagation, mechanical impact, corrosion, and extreme environmental conditions.

High ingress protection ratings (typically IP67) allow reliable operation in outdoor installations exposed to dust, moisture, chemicals, vibration, and temperature fluctuations. The robust sealing system ensures long-term durability even in oil & gas plants, refineries, chemical processing facilities, offshore platforms, and petrochemical installations.

A highly visible 3D position indicator on the top of the enclosure allows operators to confirm valve status at a glance, improving operational safety and reducing manual inspections. Internally adjustable cams enable accurate calibration of switching points, ensuring consistent performance over extended service life.

The Ex-Proof Limit Switch Box features a NAMUR standard mounting interface, enabling fast and secure installation without additional adapters. Multiple switch options, voltage ranges, and wiring configurations are available to meet project-specific requirements.

With its rugged construction, certified explosion protection, and reliable signaling performance, the UNOX Ex-Proof Limit Switch Box is a trusted solution for safe valve position monitoring in hazardous area automation systems.