Product details
Weiss Liquid Filled Process Pressure Gauge | LF4UGY2-100 | 4.5″ Dial | 0-100 PSI/kPa
Product Description
The LF4UGY2-100 is part of the Weiss professional process series, built for environments where operator safety and instrument longevity are paramount. The “LF” designation indicates that it is Liquid Filled (typically with Glycerine) to eliminate pointer flutter in high-vibration areas. The “4UGY” identifies it as a 4.5-inch (115 mm) gauge, and the “2” signifies its 316 Stainless Steel Bourdon Tube and Socket (unlike the “1” version which uses brass).
This gauge is housed in a Solid Front case made from fiberglass-reinforced thermoplastic (PBT). This safety feature includes a solid wall between the dial and the Bourdon tube, plus a Blow-Out Back, which redirects energy away from the operator in the rare event of a tube rupture. In Dubai and Abu Dhabi, these gauges are frequently specified for district cooling main headers, chemical dosing skids, and high-pressure water treatment plants.
Key Features
- Safety Solid Front Design: Provides an internal barrier and a blow-out back to protect personnel from high-pressure releases.
- 316L Stainless Steel Internals: Both the socket and the Bourdon tube are crafted from 316L Stainless Steel, offering maximum corrosion resistance against aggressive fluids and saline environments.
- Glycerine Filling: Dampens mechanical vibration and pulsation, ensuring a steady, readable pointer and reducing wear on the stainless steel movement.
- Dual Scale (PSI/kPa): Displays pressure in both imperial (PSI) and metric (kPa) units, meeting international and UAE project specifications.
- Superior Accuracy: Calibrated to ASME B40.1 Grade 2A ($\pm$5%), making it a high-precision instrument for critical process monitoring.
Technical Specifications
| Specification | Details |
| Brand | Weiss Instruments |
| Model | LF4UGY2-100-4L (Standard Lower Mount) |
| Dial Size | 4.5″ (115 mm) |
| Range | 0 – 100 PSI / 0 – 700 kPa |
| Internal Material | 316L Stainless Steel (Tube & Socket) |
| Case Material | Fiberglass Reinforced Thermoplastic (PBT) |
| Window Material | Tempered Safety Glass |
| Accuracy | $\pm$
0.5% of Span (ASME Grade 2A) |
| Connection Size | 1/4″ or 1/2″ NPT Lower Mount |
Frequently Asked Questions
- Q: Why choose the LF4UGY2 over the standard LF441?
- A: The LF4UGY2 is a “Process Gauge” with a higher accuracy ($\pm$5% vs $\pm$1.0%) and a safety solid front. It is used where higher precision and operator protection are required.
- Q: Can this be used for corrosive chemicals?
- A: Yes, because the wetted parts are 316L Stainless Steel, it is compatible with a wide range of corrosive fluids and gases that would damage brass gauges.
- Q: Does the liquid need to be changed?
- A: Generally no, but if the Glycerine becomes discolored over time due to UV exposure or temperature cycles, it can be easily field-filled through the top fill-plug.
