Overview
The Barksdale D2H-H18 is a dual-setpoint, housed diaphragm pressure/vacuum switch engineered for precise control in low-pressure industrial applications. The housed D2H model features a durable, anodized aluminum enclosure with an integrated 1/2″ NPT conduit connector, a tamper-resistant cover for the set point adjustment screws, and is rated to NEMA 4 as a standard. This switch delivers instrument-class accuracy and is widely used in HVAC, refrigeration, pneumatic systems, and process control.
Key Features
- Ideal for applications demanding instrument-class accuracy and where pressure pulsations are less than 25 cycles per minute.
- Suitable for use in either positive pressure or vacuum applications.
- Dual-setpoint functionality for flexible control logic
- Tamper-resistant adjustment mechanism
- Integrated 1/2″ NPT conduit connector for easy panel mounting
Technical Specifications
- Adjustable range: 0.4–18.0 PSI (0.028–1.24 BAR)
- Proof pressure: 60 PSI (4.14 BAR)
- Electrical rating: 10 amps @ 125/250 VAC; 3 amps @ 480 VAC (standard for 18SS pressure range)
- Enclosure: Anodized aluminum, NEMA 4 rated
- Pressure connection: Standard 1/4″ NPT female
- Circuit type: Dual setpoint
- Sensing element: Diaphragm
Typical Applications
- HVAC and refrigeration control systems
- Pneumatic system monitoring and pressure regulation
- Process control and instrumentation
- Vacuum monitoring and backup systems
- Industrial fluid power circuits
Compatibility & Replacements
Compatible With
- Standard industrial 125 VAC/250 VAC/480 VAC control systems
- HVAC and refrigeration equipment
- Pneumatic and low-pressure fluid power systems
- OEM and retrofit pressure monitoring applications
Replaces / Drop-In Replacement For
- Barksdale D2H-H18SS (housed variant with stainless steel option)
- Other D2H series 0.4–18 PSI switches
Works With
- Standard industrial control circuits (single/dual relay logic)
- Building management systems (BMS)
- Process control instrumentation
- 24/480 VAC electrical panels
