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BM-45-RH Diaphragm Switch


Diaphragm switch with heavy duty .031” thick, black neoprene diaphragm, internally mounted

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Simple, low-cost level detection and alerts for bins

The BM45 standard pressure switch alerts to high or low levels in bins containing non-hazardous, free-flowing dry materials.

Tired of climbing bins to know if they are full? Want to stop overfilling bins?

Get affordable point level control for bins containing free-flowing dry solids with a density >20 lb./cu. ft.

How it works:

When material presses against the diaphragm, it activates a sensitive micro-switch that can be wired to start or stop a process or alert to high or low levels in bins using a horn or alarm.

Diaphragm switch features:

  • For bins and some plugged chute applications
  • Rugged construction and simple design
  • Die-cast aluminum housing
  • Neoprene or silicone diaphragm material
  • Internal or external mount
  • Multiple voltages

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
Voltage Up to 480 VAC
OutputsRelay SPDT
Ambient Temperature-40°F to +300°F (-40°C to +148°C)
Process TemperatureUp to +300°F (148°C)
Enclosure MaterialDie cast aluminum

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-45 Brochures

BM-45 Manuals

BM-45 Spec Drawings

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