EXD-AR-3 HONEYWELL

Product Dimensions：

The EXD-AR-3 features a heavy-cast aluminum enclosure designed to withstand internal explosions and contain hot gases, thereby preventing ignition of external explosive mixtures. It utilizes a top-plunger or roller-lever actuator arrangement (specifically designated by the "AR" coding for a side-rotary roller lever) with a double-break basic switch inside. The unit is designed with generous internal wiring space to simplify field installation and maintenance in restricted industrial spaces.

Product Parameters

• Switch Type: Explosion-Proof Limit Switch

• Actuator Style: Side-rotary lever with a roller

• Circuitry: Single-Pole Double-Throw (SPDT) double-break or Double-Pole Double-Throw (DPDT) options depending on internal basic switch configuration

• Contact Rating: Typically rated up to 15 A, 125/250/480 VAC

• Housing Material: Cast aluminum with corrosion-resistant epoxy coating

• Conduit Entry: 1/2 in - 14 NPT thread

• Operating Temperature: Range typically spans from -40°C to 71°C (-40°F to 160°F)

• Hazardous Location Certifications: UL Listed, CSA Certified for Class I, Groups B, C, D (Explosive Gases) and Class II, Groups E, F, G (Combustible Dusts)

• Enclosure Rating: NEMA 1, 3, 4, 7, and 9

Product Advantages

A key advantage of the EXD-AR-3 is its Exceptional Safety Profile in hazardous areas, offering robust flame-path construction that meets stringent industrial explosion-proof standards. The Heavy-Duty Construction ensures long mechanical life even under severe physical impacts, vibration, or exposure to harsh weather elements. Its High Electrical Capacity allows it to directly control motor loads or high-current industrial circuits without requiring intermediate control relays. Additionally, the Adjustable Roller Lever provides physical versatility during setup, allowing technicians to fine-tune the actuation position to match complex mechanical movements.

Important Considerations and Precautions

When installing and maintaining the EXD-AR-3, strictly observe all local and national electrical safety codes regarding explosion-proof installations. The flame paths on the cover mating surfaces must be kept clean and free from scratches, paint, or debris, as any damage to these ground surfaces can compromise the switch's explosion-proof integrity. Ensure all conduit connections use approved explosion-proof seals within the specified distance from the switch enclosure to prevent gas migration through the conduit system. Do not open or service the enclosure while circuits are energized in a hazardous atmosphere. Always apply proper torque to the cover screws to guarantee the NEMA weather-tight seal and flame-path gap remain within specified tolerances.

Product Applications

The Honeywell EXD-AR-3 is widely deployed in industrial facilities where safety and flame containment are critical.

• Petrochemical and Refineries: Valve position monitoring, pump control, and gate position sensing in areas with volatile hydrocarbon vapors.

• Grain Elevators and Processing: Position detection on conveyors, diverters, and storage bins where combustible dust accumulation poses an explosion risk.

• Paint Spray Booths and Chemical Plants: Actuation sensing on automated doors, ventilation dampers, and mixing equipment exposed to solvent fumes.

• Waste Treatment and Biogas Facilities: Monitoring physical positions of valves and hatch covers in methane-rich environments.

• Pharmaceutical Manufacturing: Limit sensing on processing vessels and material handling equipment operating in solvent-laden atmospheres.

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