MDP VTL-B Explosion-proof Limit Switch

A series of explosion-proof limit switches, specially designed for high-risk explosive environments such as those in the petroleum, chemical, and gas industries, have passed ATEX certification (Ex d IIC T6), are compatible with gas environments of classes I, IIA, IIB, and IIC, and have a surface temperature of ≤ 85℃, completely eliminating the risk of electrical sparks.
The product features a die-cast aluminum alloy housing (with anti-corrosion coating) + IP68 protection, capable of operating underwater for a long time at a depth of 1 meter. It is resistant to impact, salt fog, acid and alkali. It is compatible with serrated anti-loosening cams and NAMUR standard installation. It directly fits over 90% of ISO actuators and improves on-site installation efficiency by 50%. It supports mechanical contacts (5A-16A), proximity sensors, 4-20mA transmitters, and multiple switch configurations. It is compatible with ½" NPT/G, M20×1.5 and other interfaces, meeting the diverse needs of PLC/DCS systems.
From extremely low temperatures of -15℃ to high temperatures of +80℃, these valves can stably monitor and provide feedback on the opening and closing of equipment in harsh conditions such as water treatment, marine engineering, and metallurgy. This is a "necessary safety feature" for automated control in dangerous areas.

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Model:
MDP VTL-B
Brand:
MDP

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Product Description

MDP VTL-B/D Explosion Proof Limit Switch – Reliable Valve Position Feedback for Hazardous & Harsh Environments

Overview – Industrial-Grade Safety and Durability

The MDP VTL-B/D Series Explosion Proof Limit Switch is engineered for critical applications in oil & gas, petrochemical, pharmaceutical, marine, and wastewater industries. With ATEX certification (Ex d IIC T6) and IP68 ingress protection, this limit switch ensures precise valve position feedback in explosive atmospheres and extreme environmental conditions—without compromising safety or performance.

Built with a corrosion-resistant cast aluminum housing and NBR O-ring sealing, the VTL-B/D can withstand underwater immersion, salt spray, acid rain, and temperatures from -15°C to +80°C. Its mechanical interlocking serrated cam and NAMUR-standard mounting make installation quick and vibration-proof, reducing downtime and labor costs.

Key Product Highlights

ATEX Certified for Hazardous Locations

Explosion-proof rating: Ex d IIC T6, suitable for Class I, IIA, IIB, IIC gas groups, including hydrogen and acetylene.
Meets EU ATEX directive and IEC 60079 standards.
Surface temperature ≤85°C, preventing ignition in high-risk flammable gas environments.

IP68 Protection for Wet and Corrosive Environments

Dust-tight and waterproof—rated for continuous immersion underwater (up to 1 meter).
Cast aluminum body with anti-corrosion powder coating plus full PCB encapsulation.
Resistant to harsh elements: seawater, chemicals, UV radiation, and extreme temperatures.

Fast Installation with NAMUR Standard Compatibility

Designed to NAMUR (EN 50041) specifications, fitting most ISO-compliant actuators such as ball, butterfly, and gate valves.
Serrated cam design ensures strong mechanical locking and stable contact under vibration.
Multiple electrical interfaces: ½" NPT, ½" G, M20×1.5, ¾" NPT, covering global installation needs.

Technical Specifications at a Glance

Certifications & Ratings

Explosion proof: ATEX Ex d IIC T6
Protection: IP68 (waterproof & dustproof)
Temperature range: -15°C to +80°C
Humidity tolerance: Up to 95% RH non-condensing

Electrical Options

Mechanical SPDT/DPDT switches: 5A–16A @ 125/250V AC, 220V DC (brands: Donghai, Cherry)
Proximity sensors: 8V–24V DC, 3mA–200mA, NO/NC (Pepperl+Fuchs compatible)
4–20mA position transmitters: Analog output for PLC/DCS
Wiring: Pre-wired PCB for easy replacement

Mechanical Details

Housing material: Powder-coated aluminum (optional stainless steel CF8M)
Mounting brackets:
- US (universal)
- S-1 (30×80×20mm, for VT50–VT110)
- S-2 (30×130×30mm, for VT125–VT400)
Cam: Serrated anti-vibration locking type

Applications Across Industries

Thanks to its rugged build and versatile configuration options, the VTL-B/D limit switch is ideal for:

Oil & Gas: Offshore platforms, refinery pipelines, LNG terminals.
Chemical & Petrochemical: Explosion-prone production lines.
Water & Wastewater: Submersible pump controls, dam valve monitoring.
Marine Engineering: Saltwater corrosion resistance for shipboard systems.
Pharmaceutical & Food: Hygienic area compatibility (non-direct contact with media).

Frequently Asked Questions (FAQ)

Is the VTL-B/D safe for use in explosive gas environments?

Yes. It is ATEX-certified (Ex d IIC T6) and suitable for Group I, IIA, IIB, and IIC hazardous gases, including hydrogen and acetylene. The flameproof enclosure prevents internal explosions from igniting external atmospheres.

Can it be installed outdoors in wet or corrosive conditions?

Absolutely. With IP68 protection, it can operate continuously underwater (1m depth) and resists corrosion from saltwater, chemicals, and UV exposure.

What types of switches can be integrated?

The VTL series supports mechanical SPDT/DPDT switches, proximity sensors, and 4–20mA position transmitters. This allows seamless integration into both simple relay-based systems and advanced PLC/DCS automation setups.

Why Choose MDP VTL-B/D Explosion Proof Limit Switches?

Safety First: Full ATEX compliance for hazardous locations.
Rugged Reliability: IP68, corrosion-proof housing for harsh environments.
Quick Deployment: NAMUR-standard mounting and multi-interface compatibility reduce installation time.
Global Standards: Meets ATEX, IEC, and NAMUR requirements for international projects.