Ashcroft 83220 Pressure Gauge 3.5 in Dial Npt Lower Mount

Product Description

The ASHCROFT 83220 is an analog pressure gauge designed for measuring both vacuum and positive pressure in a single scale. It reads from -30 inches Hg to 0 to 15 psi, making it well-suited for compound pressure monitoring in HVAC, refrigeration, plumbing, and light industrial applications. The gauge features a 3.5-inch dial for easy field reading, a stainless steel case for corrosion resistance, and a 1/4-inch NPT lower-mount connection. Accuracy is rated at 1 percent of full scale. Licensed HVAC technicians and plumbers typically install this gauge on suction lines, process piping, and pressure test setups.

This compound gauge is applicable in residential and light commercial environments where both negative and positive pressure readings are required in a single instrument. Typical installations include HVAC refrigeration circuits, hydronic systems, compressed air lines, and plumbing pressure test rigs. The lower-mount NPT connection allows for direct inline or manifold mounting. The dry, non-liquid-filled design keeps the gauge straightforward to service and replace in the field.

Key Features

• Compound scale reads -30 inches Hg vacuum to 15 psi positive pressure
• 3.5-inch analog dial for clear, at-a-distance reading
• 1/4-inch NPT lower-mount connection for direct inline installation
• Stainless steel case provides corrosion and impact resistance
• 1 percent of full-scale accuracy for reliable field measurements
• Dry (non-liquid-filled) design simplifies replacement and servicing

Compatibility

Designed as an OEM-style replacement or direct-install compound pressure gauge for HVAC, refrigeration, plumbing, and light industrial systems requiring a 1/4-inch NPT lower-mount connection and a compound vacuum-to-positive pressure range.

Installation Notes

Installation is typically performed by a licensed HVAC technician or plumber. De-pressurize and isolate the line before removing an existing gauge or installing this unit. Use PTFE thread tape or appropriate thread sealant on the NPT fitting and tighten per standard pipe-fitting practice without over-torquing. Verify the system pressure range does not exceed the gauge maximum before returning the system to service.