Product details
Weiss Liquid Filled Pressure Gauge | LF442 | 4″ Dial | 0-160 PSI/BAR
Product Description
The LF442 is designed to withstand the mechanical stress that causes standard dry gauges to fail. The “LF” designation indicates that the case is Liquid Filled (typically with Glycerine), which dampens the internal movement, eliminates pointer flutter, and provides continuous lubrication to the precision gear system.
The “442” identifies this model as a 4-inch (100 mm) dial with a Rear (Center Back) Mount connection. This back-mount design is preferred for flush-mounting on control panels or for installation on the side of vertical pipelines in Dubai and Abu Dhabi mechanical rooms. The 0 to 160 PSI (11 BAR) range is the most common specification for Domestic Water Booster Pumps and standard Chilled Water (CHW) supply headers.
Key Features
- Vibration Dampening: The Glycerine filling stabilizes the needle, allowing for accurate readings even in high-pulsation environments near reciprocating pumps or compressors.
- Corrosion-Resistant 304 SS Case: The stainless steel housing is crimp-sealed to provide a leak-proof container for the dampening fluid and to resist the humid and saline air of the UAE.
- Rear (Back) Mount Configuration: Ideal for panel mounting or applications where a clean, front-facing dial is required on the side of a pipe.
- Dual Scale (PSI/BAR): Displays pressure in both imperial and metric units, satisfying international project requirements and local UAE standards.
- Internal Protection: The liquid filling prevents internal condensation and fogging on the lens, ensuring the dial remains clear in temperature-volatile plant rooms.
Technical Specifications
| Specification | Details |
| Brand | Weiss Instruments |
| Model | LF442 (0-160 PSI/BAR) |
| Dial Size | 4″ (100 mm) |
| Range | 0 – 160 PSI / 0 – 11 BAR |
| Filling | Glycerine (Standard) |
| Mounting Type | Rear Mount (Center Back) |
| 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 the LF442 (Rear Mount) instead of the LF441 (Lower Mount)?
- A: The LF442 is used when you want to mount the gauge through a panel or when the piping layout requires the connection to come from the back rather than the bottom.
- Q: Is the Glycerine filling affected by the heat in the UAE?
- A: Glycerine is stable at high temperatures. The gauge includes a safety relief plug (vent) at the top to equalize internal pressure caused by thermal expansion of the liquid.
- Q: Does this gauge require a siphon?
- A: Only if used on steam service. For water, air, or oil, it can be mounted directly or via a needle valve.