Ashcroft 91547XLL Pressure Gauge 0-400 Psi 4.5 in Dial

Product Description

The ASHCROFT 91547XLL is a process industrial pressure gauge designed for demanding industrial and commercial applications. It features a 4.5-inch analog dial with a measurement range of 0 to 400 psi and delivers 0.5% of scale accuracy. The gauge is constructed with an aluminum case and stainless steel wetted parts, providing corrosion resistance in process environments. The no-fill design keeps maintenance requirements low. A glass lens protects the dial face. This gauge is typically installed by licensed pipefitters, HVAC technicians, or industrial maintenance professionals working on process piping, fluid systems, or mechanical equipment.

This gauge is suited for process industrial installations in both commercial and industrial settings where a reliable, permanent pressure-monitoring point is required. The rear flange mount configuration allows direct panel or pipe-wall mounting without additional adapters in many standard setups. The 0.5-inch MNPT threaded connection mates with standard male NPT process connections. The 4.5-inch dial size supports easy readability at a distance, making it well suited for equipment rooms, mechanical spaces, and process skids where technicians need at-a-glance pressure readings.

Key Features

• 4.5-inch analog dial with 0 to 400 psi measurement range
• 0.5% of scale accuracy for reliable process monitoring
• Stainless steel wetted parts for corrosion resistance in process fluids
• Aluminum case construction for reduced weight
• Rear flange mount for direct panel or wall installation
• No-fill design — no liquid fill maintenance required
• Glass lens for clear dial visibility and face protection

Compatibility

Designed as an OEM-style process gauge for industrial and commercial piping systems requiring a 0.5-inch MNPT rear-entry connection and a rear flange mount configuration. Meets CRN and IP66/NEMA 4X standards.

Installation Notes

Installation should be performed by a qualified pipefitter or licensed mechanical technician. Depressurize and isolate the system before removing any existing gauge or fitting the new gauge into service. Apply appropriate thread sealant to the MNPT connection per site or code requirements — do not overtighten, as aluminum and stainless gauge bodies can be damaged by excessive torque. Verify that the operating pressure of the system does not exceed the maximum rated range of 400 psi during normal or transient conditions.