Weiss Instruments lf251-600-4l Refrigeration Gauge 0-600 Psi

Product Description

The WEISS INSTRUMENTS lf251-600-4l is a liquid-filled, stem-mount pressure gauge built for refrigeration service applications. The 2.5-inch dial face provides a clear pressure reading across a 0-600 psi range, making it suitable for high-pressure refrigerant circuit monitoring. The stainless steel case resists corrosion in wet or chemically active environments, and the liquid-filled internals dampen needle vibration for stable, readable output under dynamic system conditions. Accuracy is rated to ANSI Grade B, which specifies plus or minus 2 percent of span at mid scale. HVAC and refrigeration technicians install this gauge on manifolds, system ports, and service lines where durable, accurate pressure readings are required.

This gauge is intended for refrigeration and HVAC pressure monitoring in both commercial and light-industrial settings. Typical applications include high-side and low-side service connections, compressor discharge and suction monitoring, and pressure testing of refrigerant circuit components. The 1/4-inch NPT stem connection is a standard fitting size found on most service valves, manifold gauge sets, and process fittings used in refrigeration work. Installation is handled by licensed HVAC-R technicians as part of routine system commissioning, service, or diagnostic procedures.

Key Features

• Liquid-filled internals reduce needle vibration for stable readings in high-vibration environments
• 0-600 psi range covers high-pressure refrigerant circuit service requirements
• Stainless steel case provides corrosion resistance in refrigeration and industrial environments
• ANSI Grade B accuracy rated at plus or minus 2 percent of span at mid scale
• 1/4-inch NPT stem mount fits standard service valves and process connections
• 2.5-inch dial face for clear, at-a-glance pressure reading

Compatibility

Designed as an OEM-style replacement or service gauge for refrigeration systems using standard 1/4-inch NPT process connections rated within the 0-600 psi operating range.

Installation Notes

Installation should be performed by a licensed HVAC-R technician in accordance with applicable codes and refrigerant handling regulations. Isolate and recover system refrigerant pressure before connecting or removing the gauge from any live circuit. Use appropriate thread sealant rated for refrigerant service on the 1/4-inch NPT connection and do not overtighten the stem fitting. Verify the system operating pressure falls within the 0-600 psi gauge range before energizing the circuit.

Technical Specifications

• Dial Size: 2.5 inches
• Pressure Range: 0-600 psi
• Accuracy: ANSI Grade B, plus or minus 2 percent at mid scale
• Case Material: Stainless Steel
• Fill Type: Liquid Filled
• Mount Type: Stem Mount
• Connection Size: 1/4-inch NPT

Standard Information

• Brand: WEISS INSTRUMENTS
• Manufacturer Part Number: lf251-600-4l