Ashcroft 82128 Pressure Gauge 2.5 in Dial Npt Center Back

Product Description

The ASHCROFT 82128 is an analog pressure gauge designed for accurate pressure measurement in HVAC, plumbing, and industrial service applications. It features a 2.5-inch dial with a compound pressure range of -30 to 60 Hg, making it suitable for both vacuum and positive pressure readings. The liquid-filled stainless steel case dampens needle vibration and protects internal components in demanding environments. Accuracy is rated at 1% of scale, which meets the needs of precision service work. A 1/4-inch NPT center back mount configuration allows direct panel or pipe installation. Licensed HVAC technicians, plumbers, and pipefitters are the typical installers.

This gauge is well suited for residential and light commercial HVAC systems, refrigeration circuits, hydronic heating loops, and plumbing pressure testing. The compound range covers both vacuum and low positive pressure, making it a practical choice for evacuation monitoring and system commissioning. The center back mount orientation is standard for panel installations where the gauge face must be readable from the front of a control enclosure or service panel. The liquid fill reduces pointer flutter caused by pulsating pressures common in pump and compressor circuits.

Key Features

• Compound pressure range: -30 to 0 to 60 Hg covers both vacuum and positive pressure in a single gauge
• Liquid-filled case dampens vibration and extends service life in pulsating or high-cycle applications
• Stainless steel case resists corrosion in wet or chemically active environments
• 1% of scale accuracy for reliable, repeatable readings during system service
• 2.5-inch analog dial provides clear readability in field conditions
• 1/4-inch NPT center back mount simplifies panel and pipe installation

Compatibility

Designed as an OEM-style replacement or service gauge for HVAC, refrigeration, plumbing, and light industrial systems requiring a 1/4-inch NPT center back mount compound pressure gauge with a 2.5-inch dial.

Installation Notes

Installation should be performed by a licensed HVAC technician, plumber, or pipefitter. Shut off system pressure and depressurize the line before removing or installing any gauge. Apply thread sealant rated for the service fluid to the NPT threads and tighten to hand-tight plus a fraction of a turn with a wrench — do not overtighten stainless steel fittings. Verify the pressure range of the gauge is appropriate for the system before placing into service.