Ashcroft 94541XLL Pressure Gauge 4.5 in Rear Flange

Product Description

The ASHCROFT 94541XLL is a 4.5-inch dial analog pressure gauge designed for compound pressure measurement across a range of 30-0-30 psi. The gauge features a thermoplastic case and a rear flange mount configuration, making it well suited for panel installations where a flush or surface-mounted profile is required. Accuracy is rated at 0.5% of scale, which meets the demands of most commercial and industrial monitoring applications. This is a dry, non-liquid-filled gauge intended for systems where fluid dampening is not required. Installation is performed by licensed HVAC technicians, plumbers, and industrial instrumentation professionals.

This gauge is appropriate for use in HVAC systems, plumbing test setups, refrigeration equipment, and general industrial pressure monitoring where compound readings above and below atmospheric pressure need to be tracked. The rear flange mount allows the gauge to be secured directly to a panel or enclosure wall, keeping the dial face flush and readable. The 0.5-inch NPT rear connection threads directly into the pressure port of the system under test or monitoring.

Key Features

• Compound pressure range: 30-0-30 psi, reads both vacuum and positive pressure
• 4.5-inch analog dial for clear, at-a-distance readability
• 0.5% of scale accuracy for reliable monitoring
• Rear flange mount for panel or enclosure installation
• Thermoplastic case — lightweight and corrosion resistant
• Dry gauge (no liquid fill) for standard non-vibration environments

Compatibility

Designed as an OEM-style replacement or new-installation analog pressure gauge for HVAC, plumbing, and general industrial systems requiring a compound pressure range with a rear-flange-mount, 0.5-inch NPT connection.

Installation Notes

Isolate and depressurize the system fully before removing any existing gauge or making a new connection. Use an appropriate thread sealant on the NPT connection threads and tighten to snug fit — avoid overtightening, which can crack a thermoplastic case. The rear flange must be secured to the mounting panel before pressurizing the system. Verify the process pressure will not exceed the gauge range during normal or fault conditions.