The United Electric H100-218 Vacuum Switch is a heavy-duty, field-adjustable control engineered for precise vacuum pressure monitoring in demanding industrial and HVACR environments. This SPDT vacuum switch features a rugged, NEMA 4X epoxy-coated aluminum enclosure, making it a reliable choice for protecting pumps, compressors, and heat tracing systems against negative pressure excursions. With a 1/4″ FNPT nickel-plated brass connection and phosphor bronze bellows, the H100-218 offers a measurement range from 30″ Hg Vac to 0 PSI, ensuring critical system safety and process control. Technicians appreciate the internal tamper-resistant setpoint lock and the high/low reference scale, which simplify calibration during routine maintenance. Designed for low pressure vacuum sensing, this adjustable vacuum switch provides a standard 15A contact rating, allowing for seamless integration into industrial automation safety loops or alarm circuits. Its 1% repeatability and fixed deadband make it an essential HVAC vacuum control component for maintaining long-term system uptime and equipment protection.
Key Benefits for the Contractor
Rugged Durability: The NEMA 4X housing provides superior resistance to corrosion and moisture, ideal for wash-down or outdoor installations.
Precise Control: Features a high-quality phosphor bronze bellows to ensure accurate vacuum sensing with 1% repeatability.
Easy Installation: The 1/4″ FNPT connection and accessible wiring compartment through the slanted cover reduce labor time during field setup.
Versatile Signaling: The SPDT switch output provides flexible wiring options for normally open or normally closed logic in safety and control circuits.
Common Questions & Technical Support
Is the setpoint adjustable in the field? Yes, the United Electric H100-218 features an internal adjustment screw with a reference scale for easy field calibration without specialized tools.
What is the maximum proof pressure for this model? This unit is designed specifically for vacuum; while the operating range is 30″ Hg Vac to 0 PSI, it has a proof pressure rating of 30 PSI to prevent damage from accidental over-pressurization.
Can this switch be used in wash-down environments? The NEMA 4X enclosure is specifically designed for harsh environments, offering watertight and dust-tight protection that meets industrial epoxy-coating standards.
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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.
