Barksdale D1H-A150SS Diaphragm Pressure Switch 300 Psi Spdt

Product Description

The BARKSDALE D1H-A150SS is a diaphragm-style pressure switch designed for industrial and commercial fluid system monitoring. It features an SPDT contact form with a maximum pressure setting of 300 psi and delivers 0.5% repeatability, making it suitable for applications where consistent switching accuracy matters. The wetted components are constructed from 304 stainless steel, providing corrosion resistance in demanding media. Electrical termination is via 18-inch free leads rated at 10A at 125/250Vac and 3A at 480Vac. The switch connects through a 1/4-inch NPTF threaded port. Licensed HVAC technicians, plumbers, and industrial maintenance professionals typically install and service this type of pressure switch.

This pressure switch is suited for use in residential and commercial fluid piping systems, hydraulic circuits, and process control applications where pressure monitoring and automatic switching are required. Its stainless steel wetted materials make it compatible with a range of media including water, oils, and mild chemicals. The operating temperature range of -40 degrees F to 165 degrees F allows deployment in both cold and warm environments. The NPTF thread provides a pressure-tight seal without sealant tape in many installations, though thread sealant practices should follow site-specific requirements.

Key Features

• SPDT contact form supports normally open and normally closed circuit configurations in a single device
• 0.5% repeatability ensures consistent, reliable switching across pressure cycles
• 304 stainless steel wetted materials resist corrosion in wet and chemically active media
• 18-inch free leads rated at 10A at 125/250Vac and 3A at 480Vac for flexible wiring runs
• Minimum deadband of 2.3 psi and maximum deadband of 6.00 psi for adjustable switching differential
• Wide operating temperature range from -40 degrees F to 165 degrees F

Compatibility

Designed as an OEM-style replacement or new-installation diaphragm pressure switch for industrial, commercial, and residential fluid piping and process control systems requiring a 1/4-inch NPTF threaded connection and SPDT switching output.

Installation Notes

Installation should be performed by a licensed plumber, HVAC technician, or qualified industrial maintenance technician in accordance with applicable local codes. Shut off and depressurize the system completely before threading the switch into the port. Follow NEC guidelines when making electrical connections to the free leads, and verify that the supply voltage and amperage do not exceed the switch ratings. Do not overtighten the NPTF fitting, as diaphragm pressure switches can be damaged by excessive torque on the process connection.