Dwyer BDPA-04-2-N Adjustable Differential Pressure Switch

Product Details:

Brand Baumer
Media Type Gas, Liquid

Dwyer BDPA-04-2-N Adjustable Differential Pressure Switch
Series BDPA Adjustable Differential Pressure Alarm .12-1.60″ w.c.

24 Volt or Battery Powered, Built-in Audible and Visual Alarm

The Series BDPA Adjustable Differential Pressure Alarm with built-in audible and visual set point indication is designed for overpressure, vacuum, and differential pressure applications. The scaled adjustment knob allows changes to the switching pressure to be made without a pressure gage. The silicone diaphragm and PA 6.6 body make the Series BDPA perfect for use with air and other noncombustible gases.

The Series BDPA Adjustable Differential Pressure Alarms offer a versatile range of configurations allowing utilization of their many features. The BDPA can be powered by battery or 24 VDC/VAC line power. If connecting line power, the battery can act as back-up power in case of power outage. When set point threshold is reached, a local loud audible buzzer and bright LED will indicate periodically notifying of set point activation. An SPDT contact may also be wired to send a signal remotely to a DDC or building management system. A snooze button located through an opening in the cover can be pressed by the user to manually disengage the audible and visual indication until a maintenance operation is performed. If the instrument is mounted where it is difficult to access, a remote contact may be connected allowing the user to deactivate the buzzer and LED at the remote contact location.

The Series BDPA Differential Pressure Alarm’s great functional versatility makes it perfect for filter, fan, and ventilation applications or any retrofit job where installing electrical wiring proves cost-prohibitive.

Note: For a 1/2″ npt connection, use the 1/2″ conduit fitting adapter (A-483).


CE Approval
Reduction of Hazardous Substance (RoHS)

Service Air and noncombustible, compatible gases
Wetted Materials Diaphragm: Silicone; Housing: Switch Body: PA 6.6 and POM; Cover: Polystyrene
Temperature Limits 32 to 122°F (0 to 50°C)
Pressure Limits 40″ w.c. (10 kPa)
Electrical Rating 1.0 A @ 30 VDC/VAC
Switch Type SPDT
Alarm Indicationrm. Red LED and audible alarm
Alarm Level Approximately 90 db at 4″ (10 cm)
Alarm Acknowledge Button press
Power Requirements 16 to 30 VDC, 18 to 30 VAC or 3.6 V LS14250 lithium metal battery, installed functional, user replaceable. Battery acts as back-up if power is lost
Battery Life Approximately 1.5 years with 3.6 V/1.2 Ah
Repeatability ±15% FS
Electrical Connections Screw terminals. M20x1.5 with cable strain relief or optional 1/2″ NPT connection
Process Connections 5/16″ (7.94 mm) outside diameter tubing, 1/4″ (6.0 mm) inside diameter tubing
Mounting Orientation Vertically, with pressure connections pointing downwards
Enclosure Rating IP21
Weight 6.1 oz (173 g)
Agency Approvals CE, RoHS

Additional Information:

  • Pay Mode Terms: L/C (Letter of Credit),T/T (Bank Transfer)

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