Flame Proof Limit Switch Box

Perfect Monitoring, Control and Protection for Valve

IPC manufactures Flameproof Limit Switch boxes with all required certifications. Ideal for use in various types of industries and compatible with almost all types of pneumatic actuators, IPC make Limit Switch boxes give superior performance even in the hostile environments. IPC also introduced A.S. Interface Limit Switch box as the latest technology which communicates intelligently with other devices in network. IPC Flameproof limit switch boxes are available in Stainless Steel as well as Aluminium body.

Epoxy coated aluminium body and stainless steel shaft makes this unit ideal for use in hostile environment.

Easily adjustable serrated cams allow a very quick and fine, tool free switch adjustment.

FPB Series Box has a large two color position indicator which makes it easy to see actual valve position from the top as well as all sides.

Complies to NAMUR Mounting standards.

Various options cable entries are available (eg. 1/2” NPT, M20 x 1.5P, 3/4” NPT etc.)

FPB can be provided with optional extra terminal strip for external solenoid valve connection.

FPB can be provided with different types of switches: SPDT, DPDT, Hermetically sealed electromechanical, inductive proximity etc.

FPB can be provided with position transmitter arrangement having output signal of 4 to 20mA.

Range of Mounting Accessories having the compatibility with the various Actuator manufacturers available.

A stainless steel bracket is available as an option. Temperature range -20 °C to +60 °C.

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Frequently Asked Questions

What is a Flame Proof Limit Switch Box?

Think of it as the intelligent “eyes and ears” for an automated valve, but built like a safe. It’s an enclosure that houses switches and sensors to monitor a valve’s position (open, closed, or somewhere in between). The “flame proof” or “explosion-proof” design means it can safely operate in hazardous areas where flammable gases, vapors, or dust might be present, preventing any internal spark from igniting the surrounding atmosphere.

Why is this special "flame proof" certification so important?

Safety is everything. In industries like oil & gas, chemical processing, or mining, the air itself can become explosive. Using standard electrical equipment in these zones could trigger a catastrophic event. A certified flame proof enclosure contains any potential ignition source, ensuring that the valve’s feedback signals can be monitored without creating a safety risk for the plant and personnel.

Where are these switch boxes required?

They are essential for any valve automation in officially classified hazardous areas (Zones). You’ll find them on critical automated valves in oil refineries, offshore platforms, chemical plants, pharmaceutical facilities, grain handling, and paint booths—anywhere explosive atmospheres may occur.

What safety standards do IPC's devices meet?

Our flame proof limit switch boxes are designed and certified to meet stringent international standards for equipment used in explosive atmospheres. This includes certifications like ATEX (Europe) and IECEx (International), which are the global benchmarks for intrinsic safety.

What exactly does a limit switch box do on a valve?

Its primary job is to provide remote position indication. It sends electrical signals back to your control room (like a DCS or PLC) to confirm if the valve is fully open, fully closed, or if it has encountered an obstruction. This is vital for process control, safety interlocks, and operator awareness.

Can it be fitted to any automated valve?

Yes, they are versatile accessories. Our switch boxes can be mounted to the actuator of various automated valves including ball, gate, globe, and butterfly valves—that are equipped for such feedback. They are a key part of creating a complete, safe, and intelligent automated valve package.