Ashcroft 91548XLL Pressure Gauge 0-600 Psi 4.5 in Dial

Product Description

The ASHCROFT 91548XLL is a process industrial pressure gauge built for demanding industrial and mechanical system applications. It features a 4.5-inch analog dial with a 0 to 600 psi range and delivers 0.5% of scale accuracy. The case is aluminum construction, and all wetted parts are stainless steel for corrosion resistance in process environments. The glass lens and no-fill design keep maintenance straightforward. This gauge is installed by licensed plumbers, pipefitters, HVAC technicians, and industrial maintenance professionals who need reliable pressure monitoring on process lines and mechanical systems.

This gauge is suited for process piping, industrial fluid systems, and commercial or industrial HVAC and plumbing installations where a rear flange mount is required. The 0.5-inch MNPT rear connection allows direct in-line mounting to threaded process connections. The rear flange mount provides panel or surface mounting capability, making it practical for control panel integration or bulkhead installations. The no-fill design simplifies handling in environments where liquid-filled gauges are not preferred or permitted.

Key Features

• 4.5-inch analog dial with 0 to 600 psi pressure range
• 0.5% of scale accuracy for precise pressure readings
• Stainless steel wetted parts for corrosion resistance in process fluids
• Aluminum case construction for reduced weight and durability
• Rear flange mount with 0.5-inch MNPT connection for panel or bulkhead installation
• Glass lens with no-fill design — no liquid fill to manage or replace
• Meets CRN and IP66/NEMA 4X standards for outdoor and washdown environments

Compatibility

Designed as an OEM-style process gauge for industrial pressure monitoring applications requiring a 4.5-inch rear-mount analog gauge with a 0.5-inch MNPT connection and 0 to 600 psi range.

Installation Notes

Installation should be performed by a qualified pipefitter, plumber, or industrial technician in accordance with applicable codes and the system's pressure ratings. Depressurize and isolate the process line fully before removing or installing any pressure gauge. Apply thread sealant appropriate for the process fluid to the MNPT threads — do not overtighten, as this can damage the gauge socket or process connection. Verify the gauge range is appropriate for the system's expected operating and surge pressures before placing the system back in service.