Product details
Weiss Liquid Filled Gauge | LF441-400-4L-BR | 4″ Dial | 0-400 PSI/BAR
Product Description
The LF441-400-4L-BR is built to withstand mechanical stress that would typically destroy a standard dry gauge. The Glycerin filling serves a dual purpose: it dampens the internal movement to provide a steady, “flicker-free” pointer reading and acts as a permanent lubricant for the gear mechanism. This is particularly vital for high-pressure water and air systems in Dubai and Abu Dhabi, where equipment vibration is constant.
This model features a high-visibility 4-inch (100 mm) dial with a dual-scale range of 0-400 PSI (0-28 BAR). The “BR” designation indicates premium brass/bronze internals, while the “4L” identifies the 1/4″ NPT Lower (Bottom) Mount connection. Encased in 304 Stainless Steel with a crimped bezel, this gauge is hermetically sealed to prevent moisture ingress and internal fogging, even in the most humid coastal environments.
Key Features
- Vibration Resistance: The liquid-filled design protects the gauge from “pointer flutter,” ensuring accurate readings in high-vibration environments.
- Large 4″ Industrial Dial: The oversized face provides superior resolution and readability compared to smaller utility gauges.
- Stainless Steel Longevity: The 304 SS case is highly resistant to rust and corrosion, making it ideal for the Middle Eastern climate.
- Dual Scale Readout: Simultaneously displays PSI and BAR, making it compatible with both American and European engineering standards used in the UAE.
- Built-in Safety: Includes a top-mounted ventable plug to allow for atmospheric pressure equalization, maintaining accuracy during temperature fluctuations.
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Technical Specifications
| Specification | Details |
| Brand | Weiss Instruments |
| Model | LF441-400-4L-BR |
| Dial Size | 4″ (100 mm) |
| Range | 0 – 400 PSI / 0 – 28 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 on high-rise chilled water pumps?
- A: The 400 PSI range is perfect for the high static head pressures found in UAE skyscrapers, and the liquid filling handles the pump vibration.
- Q: Is it okay if there is a small air bubble at the top of the dial?
- A: Yes, a small bubble is intentional. It allows for the expansion and contraction of the glycerin as the temperature changes without affecting accuracy.
- Q: Can I use this for hydraulic oil?
- A: Yes, the brass internals are compatible with hydraulic oil and other non-corrosive fluids.