BM-25 Diaphragm Switch: Point Level Detector for Bins and Chutes

The BM-25 diaphragm switch is a high or low-level alert pressure switch for bins containing non-hazardous, free-flowing dry materials.

Need an Inexpensive Level Switch? Want to Know When Bins are Full or Empty?

The BM-25 diaphragm switches can help reduce overfilling and stop important grains and fertilizer from being wasted. With the help of the BM-25 diaphragm switch, users can recognize whether chutes or conveyors are clogged without making a mess.

How it Works:

When material meets the level of the switch in the bin, a sensitive microswitch is activated, which is how a diaphragm (or pressure) switch works. It provides a high-, medium- or low-level warning that may be used to start or stop a procedure.

What to Use the BM-25 for:


  • Material density from 20 lb./cu. ft
  • Monitoring levels of dry, free flowing materials
  • Installation in ordinary locations
  • Detect plugging of chutes or conveyors
  • Eliminate overflow or maintain a certain level of material
  • Levels of grain, feed, or fertilizer
  • Point level detection in bins and silos

The BM-25 is ideal for agriculture cooperatives, farmers, or any business storing dry bulk solids.


Use this Pressure Switch in Many Materials

  • Wheat, barley, corn, soybeans, or milo
  • Crops that produce nuts like sesame, sunflower, or peanuts
  • Agricultural chemicals in granular form and dry fertilizer
  • Sawdust, pieces, or pellets of wood
  • Alumina, bentonite, or potash in powder form
  • Resin pellets or plastic and rubber beads, ground
  • Landscape supplies
  • Foodstuffs such as sugar beets, rice, wheat, or oats


Features of this Reliable Point Level Switch


  • Internal or external mounting
  • Economical point level detection
  • Pressure sensing operation
  • Material for a silicone diaphragm
  • Robust design and simple construction
  • Nylon housing


Specifications Users Need to Know About the BM-25

  • Output: Switch contact closure
  • Mounting: Internal or external
  • Diaphragm Material: Silicone
  • Operating Temperature: −40 °F to +185 °F (−40 °C to +85 °C)
  • Switch Ratings: 250 VAC, 15 A
  • Enclosure Material: Nylon
  • Wire Entry: ½” NPT

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