Barksdale E1H-H90 Pressure Switch

The Barksdale E1H-H90 Pressure Switch is an industrial-grade diaphragm pressure switch designed for precision control in low-pressure HVACR and hydraulic systems. This unit features an adjustable range from 3 to 90 psi, utilizing a high-quality NEMA 4X, IP65-rated anodized aluminum enclosure to ensure durability in harsh environments. The 1/4" NPT female pressure connection allows for seamless integration into standard piping configurations, while the SPDT limit switch provides reliable electrical switching with a 10-amp capacity at 125/250 VAC. Engineered for high accuracy and repeat stability, the E1H series utilizes a Buna-N diaphragm for excellent chemical compatibility and sensitivity. The internal setpoint adjustment screw is protected from tampering and environmental exposure, making it a dependable choice for pump control, filter monitoring, and low-pressure safety cutouts where mechanical reliability is non-negotiable for professional contractors.

Key Benefits for Technicians

• Precision Setpoint Calibration: Features an internal adjustment screw for fine-tuning the pressure switch setpoint between 3 and 90# with high repeatability.
• NEMA 4X Protection: The rugged weatherproof housing protects internal components from moisture, dust, and corrosive elements.
• SPDT Contact Versatility: The Single Pole Double Throw configuration allows for both normally open and normally closed wiring options, satisfying diverse control logic requirements.
• Compact Footprint: Designed for easy installation in tight manifold or panel spaces without sacrificing mechanical performance.

Common Questions

What is the maximum operating pressure for the Barksdale E1H-H90?
While the adjustable range is 3 to 90 psi, these units are typically tested for higher proof pressures; however, it is recommended to remain within the 90 psi limit to maintain diaphragm accuracy and longevity.

Can this switch be used for hydraulic fluid applications?
Yes, the Buna-N diaphragm is compatible with standard hydraulic oils, water, and air, making it versatile across multiple HVACR and mechanical systems.

How do I wire the E1H-H90 for a low-pressure cutout?
For a safety cutout, wire the SPDT switch to the C (Common) and NC (Normally Closed) terminals so the circuit opens when the pressure drops below your specified setpoint.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.