Product details
Weiss Liquid Filled Pressure Gauge | LF401 | 4″ Dial | 0-300 PSI/BAR
Product Description
The LF401 is designed to provide stable and accurate readings where standard “dry” gauges would fail due to pointer flutter. The “LF” designation indicates that the gauge is Liquid Filled (typically with Glycerine), which dampens internal movement and lubricates the gear system. The “401” refers to the 4-inch (100 mm) dial size with a Lower (Bottom) Mount connection.
In the UAE’s industrial sector, the 300 PSI range is widely used for high-pressure water boosters, hydraulic power units, and irrigation headers in Dubai and Abu Dhabi. The 304 Stainless Steel case ensures superior durability against the humid and saline air of the Middle East, while the liquid filling prevents internal condensation and protects the instrument from the shock of sudden pressure surges.
Key Features
- Glycerine Filled Performance: Eliminates pointer vibration and protects internal components from wear caused by high-vibration equipment.
- Corrosion-Resistant Case: Features a 304 Stainless Steel housing with a crimped ring, providing a permanent, leak-proof seal against the environment.
- Large 4″ High-Visibility Dial: Offers a spacious display with bold black and red markings for clear reading of both PSI and BAR units.
- Precision Bronze Internals: Built with a heavy-duty phosphor bronze Bourdon tube and a brass socket for long-term reliability in water, oil, or gas service.
- Safety Vent: Includes a top-mounted rubber fill plug that acts as a relief valve to prevent internal pressure buildup.
Technical Specifications
| Specification | Details |
| Brand | Weiss Instruments |
| Model | LF401 (0-300 PSI/BAR) |
| Dial Size | 4″ (100 mm) |
| Range | 0 – 300 PSI / 0 – 20 BAR |
| Filling | Glycerine (Standard) |
| Mounting Type | Stem Mount (Direct) |
| Connection Location | Lower Mount (Bottom) |
| Connection Size | 1/4″ NPT (Standard) |
| Case Material | 304 Stainless Steel |
| Accuracy | ASME B40.100 Grade A ($\pm$2-1-2%) |
Frequently Asked Questions
- Q: Why use a liquid-filled gauge instead of a dry one?
- A: If your gauge is installed near a pump or compressor where the needle shakes constantly, the liquid filling will steady the needle and extend the life of the gauge by 3 to 4 times compared to a dry model.
- Q: Is the liquid safe?
- A: Yes, the Glycerine filling is non-toxic and clear. If the gauge is exposed to extremely low temperatures, Silicone filling can be requested as an alternative.
- Q: Can this be used for air compressors?
- A: It is an excellent upgrade for industrial compressors where vibration often destroys standard utility gauges.