BM 65 Diaphragm Switch for Hazardous Locations

The BM 65 is a pressure switch used for level measurement and point level detection in bins, tanks and silos containing grain, seed, feed or other granular or pelleted materials. It offers UL Class II, Groups E, F & G explosion-proof certification and can be used in hazardous environments where there is a risk of combustible dust. It provides automatic point level indication of free-flowing dry materials and can be installed to detect high, intermediate and low levels. It provides an audible or visual alert when attached to a horn, siren or light. It features simple, rugged construction and long lasting durability.

• Reliable point level detection for free flowing, dry materials
• Hazardous location approvals for UL Class II, Groups E, F & G explosion-proof certification
• Install in bins, tanks, silos, vessels and some plugged chute applications
• Feed, seed, grain, food, rubber, plastics, light powders, granules and many other materials
• Die-cast aluminum housing
• Two-year warranty

Mounting Options:

Select from either internal mounting or external mounting. Internal mounting does not require a hole be cut in the side of the bin, but does require entering the bin for installation. External mounting requires a hole is cut in the side of the bin, but does not require entering the bin for installation.

Diaphragm Materials:

Neoprene: .016” thick, black neoprene diaphragm. Neoprene is abrasion-resistant, chemical-resistant, waterproof, and stretchable.  Appropriate for process temperatures from -30°F to 220°F and material bulk density ranging from 15 to 60 lb./cu. ft.

Neoprene with Mesh: .020” thick, black neoprene with nylon mesh. This is the best diaphragm material to use in extremely high abrasive material. It has outstanding resistance to most chemicals, heat, and oils. Plus, it is flame resistant, offers excellent color stability, and weather resilience. Good for process temperatures ranging from -30°F to 270°F and material bulk densities from 15 to 90 lb./cu. ft.

Silicone: .031” thick, grey silicone diaphragm. Silicone offers the best long term resistance to environmental extremes. The chemical, electrical, and mechanical properties of silicone remains virtually unchanged in temperatures from -40°F to 350°F.  Good for materials with bulk density ranging from 15 to 60 lb./cu. ft.