Product details
Weiss Liquid Filled Gauge | LF441-300-4L-BR | 4″ Dial | 0-300 PSI/BAR
Product Description
The LF441-300-4L-BR is specifically engineered to eliminate the issues of “pointer flutter” and internal wear caused by mechanical vibration. The Glycerin filling provides continuous lubrication to the movement and dampens the impact of rapid pressure changes. This is a critical requirement for booster pump sets and HVAC equipment in Dubai and Abu Dhabi that operate 24/7.
This model features a high-visibility 4-inch (100 mm) dial with a dual-scale range of 0-300 PSI (0-20 BAR). The “BR” designation confirms high-quality brass/bronze internals, while the “4L” indicates the 1/4″ NPT Lower (Bottom) Mount connection. Encased in 304 Stainless Steel, this gauge is hermetically sealed to prevent internal fogging and protect against the humid, saline air common in the Middle East.
Key Features
- Vibration Dampening: The liquid-filled design protects the internal mechanism and ensures a steady pointer for accurate readings under stress.
- Large 4″ Dial face: Provides superior resolution and is much easier to read from a distance compared to compact utility gauges.
- Stainless Steel Durability: The 304 SS case offers exceptional resistance to rust and corrosion in demanding UAE plant room environments.
- Dual Scale Readout: Simultaneously displays PSI and BAR, making it compatible with both international and regional engineering specifications.
- Reliable Safety: Features a top-mounted ventable plug to allow for atmospheric pressure equalization, maintaining accuracy during temperature shifts.
Technical Specifications
| Specification | Details |
| Brand | Weiss Instruments |
| Model | LF441-300-4L-BR |
| Dial Size | 4″ (100 mm) |
| Range | 0 – 300 PSI / 0 – 20 BAR |
| Filling | Glycerin (Standard) |
| Connection Location | Lower Mount (Bottom) |
| Connection Size | 1/4″ NPT |
| Case Material | 304 Stainless Steel |
| Internal Material | Bronze Tube / Brass Socket |
| Accuracy | $\pm$
1.0% of Span (ASME B40.100 Grade 1A) |
Frequently Asked Questions
- Q: Can this gauge be used for chilled water systems?
- A: Yes, the 300 PSI range is the most common specification for chilled water headers in UAE high-rise buildings.
- Q: Why is there an air bubble at the top of the gauge?
- A: An air bubble is normal; it acts as a cushion to allow the glycerin to expand and contract safely as the ambient temperature changes.
- Q: Can I use this for non-corrosive gas?
- A: Yes, it is suitable for air or nitrogen, but liquid-filled gauges are primarily chosen for fluid systems where vibration is the main concern.