Product details
Weiss Liquid Filled Pressure Gauge | LF441 | 4″ Dial | 0-100 PSI/BAR
Product Description
The LF441 is designed to provide stable, accurate readings where dry gauges typically fail due to needle flutter. The “LF” designation indicates that the gauge is Liquid Filled (standard with Glycerine), which serves to dampen the movement of internal parts and provide continuous lubrication to the gear system. The “441” identifies this as a 4-inch (100 mm) dial with a Lower Mount connection.
In the UAE’s mechanical sector, the 100 PSI range is the standard for Chilled Water (CHW) and domestic water supply monitoring. The 304 Stainless Steel case provides an essential barrier against the corrosive, saline air common in coastal regions like Dubai and Abu Dhabi. The liquid filling also prevents internal condensation (fogging) in the humid Middle Eastern climate, ensuring the dial remains crystal clear.
Key Features
- Glycerine Dampening: Eliminates pointer vibration and protects the internal movement from the wear and tear caused by rapid pressure changes.
- Corrosion-Resistant 304 SS Case: Features a rugged stainless steel housing with a crimped ring, providing a permanent, leak-proof seal.
- Large 4″ High-Contrast Dial: Offers a spacious display with bold black and red markings, allowing for easy reading of both PSI and BAR units.
- Safety Vent/Fill Plug: Equipped with a top-mounted rubber plug that acts as a relief valve to prevent internal pressure buildup caused by temperature fluctuations.
- Reliable Bronze Internals: Utilizes a heavy-duty phosphor bronze Bourdon tube and a brass socket for long-term reliability in water, oil, or gas service.
Technical Specifications
| Specification | Details |
| Brand | Weiss Instruments |
| Model | LF441 (0-100 PSI/BAR) |
| Dial Size | 4″ (100 mm) |
| Range | 0 – 100 PSI / 0 – 7 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 (**±**2-1-2%) |
Frequently Asked Questions
- Q: Why use a 4″ dial instead of the standard 2.5″?
- A: The 4″ dial (LF441) provides significantly better resolution and visibility, which is essential for critical pump headers where precise pressure monitoring is required.
- Q: Is the liquid inside safe?
- A: Yes, Glycerine is a non-toxic, clear fluid. If the gauge will be exposed to extreme cold (uncommon in the UAE) or specific chemicals, Silicone filling can be provided as an alternative.
- Q: Can this gauge be used for air compressors?
- A: It is an excellent upgrade for compressors where high vibration often leads to the premature failure of standard dry gauges.
