Dwyer Instruments L4 Float Switch

The Dwyer Instruments L4 Flotect level switch is a rugged, explosion-proof float switch designed for demanding industrial liquid level monitoring. Engineered with a durable brass body and a 316 stainless steel float, this side-wall mounting unit is built to manage pump control, tank alarms, and valve automation without the failure points common in lesser hardware. By utilizing a unique magnetically actuated switching design, the L4 eliminates the need for bellows, springs, or seals, ensuring reliable performance in high-pressure environments up to 1000 psig. The SPDT snap switch provides versatile wiring configurations for both normally open and normally closed circuits. With UL and CSA listings for Class I and Class II hazardous locations, this weatherproof float switch is a standard choice for contractors managing scrubber systems, sumps, and wastewater treatment processes where equipment failure is not an option. The 1-1/2 inch NPT process connection and 3/4 inch conduit entry allow for straightforward integration into existing industrial piping and electrical layouts.

• Magnetic Actuation: Eliminates mechanical wear components like springs and bellows, significantly extending the service life in high-cycle applications.
• Hazardous Location Rated: Certified explosion-proof and weatherproof for safe operation in Class I, Groups C & D, and Class II, Groups E, F, & G environments.
• High Pressure Capability: The robust brass bar stock body handles process pressures up to 1000 psig, suitable for high-stress boiler and hydraulic systems.
• Serviceable Design: The electrical assembly can be replaced without removing the unit from the tank, minimizing system downtime for maintenance.
• Hang-up Prevention: A specialized float arm hinge design limits travel angle, preventing the float from becoming stuck in a vertical position.

What is the minimum specific gravity required for the standard float?
The standard 316 SS float requires a minimum liquid specific gravity of 0.7 to ensure accurate buoyancy and switch actuation.

Can this switch be used in high-temperature applications?
The standard L4 model is rated for process temperatures between 4°F and 275°F. For applications exceeding these limits, specific high-temperature configurations are available.

How should the switch be oriented during installation?
The unit is designed for horizontal side-wall mounting. It is critical to ensure the arrow on the side of the switch body points upward for correct float trajectory and magnet alignment.

This item is not eligible for free shipping.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.