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BM-25-F Nylon Diaphragm Switch - External Mount


The BM-25-F diaphragm switch is a pressure switch for high or low-level alerts in bins containing non-hazardous, free-flowing dry materials.  It is mounted externally.

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Point level detector for bins and chutes

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

Need an inexpensive level switch?
Want to know when your bins are full or empty?

Reduce overfills and stop wasting valuable grains and fertilizer. Know when chutes or conveyors are clogged before making a mess.

How it works:

A diaphragm (or pressure) switch works by activating a sensitive micro-switch when material reaches the level of the switch in the bin. It sends an alert that can be used to start or stop a process or alert to a high, medium, or low-level.

What to use the BM-25 for:

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

The BM-25 is great for farmers, ag cooperatives, or any business storing dry bulk solids!


Overflow Prevention
High level alerts to avoid over-filling vessel


Material Outages
Low level alerts eliminate empty conditions


Plugged Chutes
Detect when chutes are clogged with material


Process Control
Switching relay to turn a process off or on


Conveyor Overload
Prevent jamming or damaging conveyors

More Information
Means of MeasurementPressure Switch
Measurement TypePoint Level
OutputsSwitch Contact Closure
Ambient Temperature-40°F to +185°F (-40°C to +85°C)
Enclosure MaterialPlastic
Conduit Entry0.5" NPT

Replacement Parts

Introductory video about diaphragm switches.

See where diaphragm switches are made.

Get to know all the BinMaster sensors.

Affordable BM-25 pressure switch for solids.

Wiring a BM-25 pressure switch to a light.

BM-25 Brochures

BM-25 Manuals

BM-25 Spec Drawings

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