Ashcroft 351009A2BLLV/30 Pressure Gauge 3.5 in 30-0-30 Psi

Product Description

The ASHCROFT 351009A2BLLV/30 is a dual-scale analog pressure gauge designed for systems that require monitoring both positive and vacuum pressure in a single instrument. The 30-0-30 PSI range allows technicians to read vacuum on one side of zero and positive pressure on the other, making it well suited for applications where pressure can swing in either direction. The stainless steel case provides corrosion resistance in wet or industrial environments, while bronze wetted parts handle contact with common system fluids. Accuracy is rated at 1 percent of scale. The gauge mounts via a center back connection with a 1/4 inch threaded fitting and features a 3.5 inch analog dial for clear, direct readings at a distance.

This gauge is a standard fit for HVAC, refrigeration, plumbing, and light industrial applications where compound pressure monitoring is needed. The center back mount configuration is common on panel-mount installations, pressure test manifolds, and process equipment where the gauge face must sit flush against a surface. The dry, no-fill dial design keeps the instrument lightweight and avoids glycerin compatibility concerns in sensitive environments. Licensed HVAC technicians, plumbers, and mechanical contractors routinely install gauges of this type during commissioning, system testing, and routine service calls.

Key Features

• 30-0-30 PSI compound range reads both vacuum and positive pressure on a single dial
• 3.5 inch analog dial provides high visibility in panel and field installations
• Stainless steel case resists corrosion in wet and industrial environments
• Bronze wetted parts compatible with common system fluids and gases
• 1 percent of scale accuracy for reliable pressure indication
• Dry, no-fill design — no glycerin or silicone fill to manage or contain

Compatibility

Designed as an OEM-style replacement or service gauge for HVAC, plumbing, and light industrial systems requiring a 3.5 inch, center back mount, 1/4 inch NPT compound pressure gauge in the 30-0-30 PSI range.

Installation Notes

Installation is typically performed by a licensed HVAC technician, plumber, or mechanical contractor. Always depressurize and isolate the system before removing or installing a pressure gauge. Apply appropriate thread sealant to the 1/4 inch connection per local plumbing or mechanical code requirements — do not overtighten, as brass and bronze fittings are susceptible to thread damage. Verify the pressure range of the gauge is appropriate for the system before placing it in service.