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

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

Seal Material
Silicone

Outer Size
90 mm x 54 mm x 129 mm (approx.)

Thread
1/4 NPT Female

Display
No display (mechanical switch)

Grade
Industrial

Sensor Type
Diaphragm-operated differential pressure switch

Material
Die-cast aluminum housing, stainless steel diaphragm

Processing Type
Precision engineered, factory calibrated

Mount Type
Surface mount

Scale Range
0.4 to 2 in. w.c. (100 to 500 Pa)

Accuracy
10% of set point

Finishing
Powder coated aluminum housing

Measure Pressure Of
Air and compatible gases

Accessories
Mounting screws, installation manual

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

Payment Terms
Cash on Delivery (COD), Cash Against Delivery (CAD), Cash in Advance (CID), Cheque, Cash Advance (CA)

Main Export Market(s)
Australia, South America, Middle East, Western Europe, Africa, Central America, Asia, Eastern Europe, North America

Main Domestic Market
All India

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

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

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 BDPA is available with settings from 0.08" w.c. (20 Pa) to 20" w.c. (5000 Pa). 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).

Product Applications

Air filter and ventilator monitoring
Industrial cooling circuits
Fire-protection damper control
Ventilation duct monitoring
Fan heater overheating protection
Heat exchanger frost protection

Specification

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

Precision-Engineered for Industrial Use

Built for rigorous applications, the BDPA-04-2-N is designed to monitor and control air pressure differentials with exceptional repeatability. Its reliable performance aids in maintaining safety and efficiency in HVAC, filter monitoring, and air flow measurement systems. The stainless steel diaphragm and powder-coated housing ensure the switch withstands industrial conditions.

User-Friendly External Adjustment

The switchs external adjustment screw enables straightforward calibration of set points without disassembly. This feature offers technicians flexibility in field adjustments, reducing downtime and enhancing maintenance efficiency. The installation process is simplified with included mounting screws and manual, while the surface mount design suits many facility layouts.

Durable and Secure Housing

Protected by an IP54-rated, die-cast aluminum housing, the BDPA-04-2-N keeps internal components safe from dust and splashes. The powder-coated finish ensures longevityeven in harsh industrial settings. With brass pressure connection and silicone seals, the switch provides reliable performance over a wide temperature range from -10C to 60C.

FAQs of Dwyer BDPA-04-2-N Adjustable Differential Pressure Switch:

Q: How is the set point adjusted on the BDPA-04-2-N differential pressure switch?

A: The set point is adjusted externally using a dedicated screw, allowing technicians to fine-tune the pressure switch conveniently without opening the housing or interrupting the process.

Q: What types of media can the BDPA-04-2-N pressure switch measure?

A: The switch is designed for air and compatible gases, making it suitable for applications in ventilation, HVAC, and filter monitoring systems.

Q: When should the pressure switch be installed in a system?

A: The BDPA-04-2-N should be installed during the setup phase of pressure monitoring systems or when retrofitting to provide differential pressure control in industrial environments.

Q: Where is the BDPA-04-2-N typically mounted?

A: This device is surface-mounted using the included installation accessories, making it easy to attach to walls or panels in industrial and commercial facilities.

Q: What is the process for installing the BDPA-04-2-N?

A: Installation involves securing the switch using the provided mounting screws, connecting the 1/4 NPT female pressure ports to the system, and wiring the SPDT contacts according to the supplied manual.

Q: What are the benefits of using this adjustable differential pressure switch?

A: Benefits include precise monitoring, reliable repeatability (1% full scale), durable protection with IP54 rating, and easy set point adjustmentmaking maintenance simple and minimizing operational disruptions.

Q: Is the BDPA-04-2-N suitable for outdoor or wet environments?

A: Thanks to its IP54 enclosure, the switch is protected against dust and light splashing water, making it suitable for most industrial indoor settings. For continuous outdoor or direct wet exposure, additional protection may be required.

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