Ashcroft 35109A2BLLV/100 Pressure Gauge 3.5in 30-0-100 Psi

Product Description

The ASHCROFT 35109A2BLLV/100 is an analog pressure gauge designed for accurate pressure measurement across a compound range of 30 to 0 to 100 psi. It features a 3.5-inch dial face, stainless steel case, and bronze wetted parts, making it well suited for demanding service environments. The center back mount configuration allows direct panel or piping installation with a 1/4-inch threaded connection. Accuracy is rated at 1 percent of full scale, which meets typical industrial and mechanical service requirements. This gauge is dry-fill, with no liquid filler, keeping it lightweight at 0.25 pounds. Licensed plumbers, pipefitters, HVAC technicians, and mechanical contractors are the primary installers of this type of instrument.

This gauge is applicable in residential, commercial, and light industrial settings where compound pressure readings are needed, such as refrigeration systems, hydronic heating loops, compressed air lines, and water supply monitoring. The stainless steel case resists corrosion in humid or wash-down environments, while the bronze wetted parts are compatible with a wide range of non-corrosive media. Center back mount placement suits panel-mounted instrument arrays and direct pipe-tapping applications where a clean, flush-mounted appearance is required.

Key Features

• Compound pressure range: 30 to 0 to 100 psi for both vacuum and positive pressure measurement
• 3.5-inch analog dial for easy field reading at a distance
• 1 percent of full-scale accuracy for reliable instrumentation-grade readings
• Stainless steel case provides corrosion resistance in harsh or wet environments
• Bronze wetted parts compatible with common non-corrosive media including water and air
• Dry-fill design — no liquid filler — reduces weight and simplifies handling

Compatibility

Designed as an OEM-style replacement or new-installation pressure gauge for residential and commercial mechanical systems requiring a 1/4-inch center back mount, 3.5-inch dial, compound range analog gauge.

Installation Notes

Installation should be performed by a licensed plumber, pipefitter, or HVAC technician in accordance with applicable local mechanical codes. Depressurize and isolate the system fully before removing an existing gauge or making the threaded connection. Apply appropriate thread sealant to the 1/4-inch male threads and tighten to the fitting using a wrench on the gauge's hex fitting — never apply torque through the case or dial. Verify the system pressure range is within the gauge's rated scale before returning the system to service.