Overview
The Barksdale D2H-H18 is a dual setpoint diaphragm pressure switch housed in a durable NEMA 4 anodized aluminum enclosure. This pressure or vacuum actuated switch delivers instrument-class accuracy across an adjustable 0.4–18 PSI range with a 60 PSI proof pressure rating. Ideal for precise control in hydraulic systems, air pressure regulation, and vacuum applications where pressure pulsations remain below 25 cycles per minute.
Key Features
- Dual setpoint configuration for independent upper and lower pressure control
- NEMA 4 housing with anodized aluminum enclosure and tamper-resistant adjustment screws
- Instrument-class accuracy suitable for demanding industrial control applications
- Operates with both positive pressure and vacuum media
- 1/2″ NPT conduit connector integrated into enclosure
- 1/4″ NPT female pressure connection
Technical Specifications
The D2H-H18 switch meets exacting control requirements with the following electrical and mechanical characteristics:
- Adjustable Pressure Range: 0.4–18 PSI (0.028–1.24 bar)
- Proof Pressure: 60 PSI (4.14 bar)
- Electrical Rating — 60 Hz: 10 A @ 125 VAC; 10 A @ 250 VAC; 3 A @ 480 VAC
- Housing Rating: NEMA 4
- Diaphragm Type: Sealed, instrument-class accuracy
- Pressure Connection: 1/4″ NPT female
- Conduit Connection: 1/2″ NPT
- Weight: 1.92 lbs
- Operating Pressure Stability: Optimal below 25 pressure pulsations per minute
Typical Applications
- Hydraulic system pressure monitoring and control
- Pneumatic air compressor cut-in/cut-out regulation
- Vacuum pump or vacuum system protection and switching
- Industrial pump discharge pressure control
- Circulation pump protection in cooling or lubrication systems
- Machine tool coolant pressure regulation
- Backup or redundant pressure sensing in safety-critical circuits
Compatibility & Replacements
Compatible With
- Hydraulic systems operating at 0.4–18 PSI adjustable setpoint
- Pneumatic systems and air receivers
- Vacuum systems and equipment
- Industrial electrical control panels rated 125/250/480 VAC
- Motor control centers and pressure-control relay circuits
Replaces / Drop-In Replacement For
- Earlier generation Barksdale D2H-H18 units
- Verify compatibility with your system integrator before ordering; model variants (D2H-H18SS) may differ in materials or electrical certification.
Works With
- NEMA 4 and IP65-rated industrial enclosures
- AC electrical control circuits (125/250/480 VAC, 60 Hz)
- Pressure gauge interfaces and transducer feedback loops
- PLC and relay-based pressure monitoring systems
