Ametek 256151 Pressure Gauge 30-0-30 Psi 2.5 in Dial

Product Description

The AMETEK 256151 is an analog pressure gauge designed for monitoring both positive and negative pressure (compound measurement) in mechanical systems. It features a 2.5-inch dial face with a 30-0-30 psi range, allowing technicians to read vacuum and pressure on a single instrument. The lower-mount 1/4-inch threaded connection makes inline and panel installation straightforward. Accuracy is rated at 1.6 percent of scale, which meets general-purpose requirements for HVAC, plumbing, and refrigeration service work. This gauge is not liquid-filled, making it suitable for clean, low-vibration service environments.

This gauge is used in residential and light commercial applications where compound pressure readings are needed — for example, verifying system pressures on pumps, compressors, or distribution manifolds. It is well-suited for HVAC technicians, plumbers, and mechanical service professionals working with systems that may operate in both vacuum and positive pressure conditions. The lower-mount connection allows direct installation on pipe fittings, valve bodies, or test ports with standard 1/4-inch NPT or BSP threads.

Key Features

• Compound 30-0-30 psi range reads both vacuum and positive pressure on one dial
• 2.5-inch analog dial face for clear, at-a-glance readings
• 1.6 percent of scale accuracy for reliable general-purpose measurement
• Lower-mount connection simplifies direct pipe or valve body installation
• Dry (non-liquid-filled) construction suited for clean, low-vibration environments
• Compact 1/4-inch threaded entry fits standard service ports and manifold fittings

Compatibility

Designed as an OEM-style replacement or service-grade gauge for residential and light commercial mechanical systems requiring compound pressure monitoring via a lower-mount 1/4-inch threaded connection.

Installation Notes

Installation is typically performed by licensed HVAC technicians or plumbers. Isolate and depressurize the system fully before removing or installing any pressure gauge. Apply appropriate thread sealant to the 1/4-inch threaded fitting and tighten by hand before using a wrench — avoid over-torquing, which can crack the gauge body or distort the connection. Verify the system pressure range falls within the 30-0-30 psi gauge range before placing the system back in service.