VEGA FLEX81 guided level transmitter
VEGA FLEX81 guided level transmitter
The VEGA FLEX 81 is a guided wave radar (GWR) level transmitter from VEGA, designed for continuous measurement of liquid level and interface level (the boundary between two immiscible liquids). It operates by sending microwave pulses along a probe and analyzing the reflected signals — a principle known as Time Domain Reflectometry (TDR). This measurement method is largely unaffected by medium density, vapor, foam, or fluctuations in temperature and pressure.
| Feature | Description |
|---|---|
| High Accuracy | Achieves ± 2 mm accuracy across the entire measuring range, suitable for precise inventory and process control. |
| Long Measuring Range | Maximum range of up to 75 meters (246 ft), covering everything from small tanks to large storage vessels. |
| Low Dielectric Constant (DK) Capability | Reliably measures liquids with low DK values, including liquefied gases (e.g., LPG, ammonia), thanks to advanced signal processing. |
| Flexible Probe Options | Available in cable (up to 75 m), rod (up to 6 m), and coaxial (ideal for turbulent surfaces, foam, or low-DK media) designs. Probes can be cut to length on-site for maximum application flexibility. |
| Robust & Maintenance-Free | Wetted parts available in 316L, Alloy C-22, and other corrosion-resistant materials. The probe design resists buildup, and comprehensive self-diagnostics ensure reliable operation with virtually no routine maintenance required. |
| Specialized for Ammonia (NH₃) | Offers a specially designed coaxial probe with enhanced sealing for ammonia service, preventing medium penetration and ensuring long-term safety in this demanding application. |
| Parameter | Details |
|---|---|
| Measuring Principle | Time Domain Reflectometry (TDR) — Guided Wave Radar |
| Measuring Range | Up to 75 m (246 ft) |
| Accuracy | ± 2 mm |
| Process Temperature | –60 °C to +200 °C (–76 °F to +392 °F) |
| Process Pressure | –1 to +40 bar (–100 kPa to 4 MPa / –14.5 to 580 psi) |
| Probe Types | Cable, Rod, Coaxial |
| Output Signals | 4…20 mA / HART®, Profibus® PA, FOUNDATION™ Fieldbus, and others |
| Enclosure Rating | Up to IP66 / IP68 (dependent on housing and cable gland selection) |
| Hazardous Area Approvals | ATEX, IECEx, CSA, NEPSI, etc. |
| Functional Safety | Optional SIL2 certification per IEC 61508 (for use in safety instrumented systems) |
The VEGA FLEX 81's versatility comes from its three probe designs, each suited to different applications:
| Probe Type | Range | Best For |
|---|---|---|
| Cable Probe | Up to 75 m | Large storage tanks, deep wells, and long-range level measurement. |
| Rod Probe | Up to 6 m | Small tanks, bypass chambers, and short-range applications. |
| Coaxial Probe | Up to 6 m | Low-DK media (e.g., hydrocarbons, liquefied gases), turbulent surfaces, foaming liquids, and ammonia (NH₃) applications. Provides the strongest signal and is least affected by tank internals. |
Oil & Gas: Crude oil storage, LPG/LNG tank level, interface measurement in separators
Chemical & Petrochemical: Reactor vessels, distillate tanks, corrosive chemical storage
Power Generation: Boiler feedwater tanks, condensate storage
Refrigeration & Cryogenic: Ammonia (NH₃) level in chiller systems and storage tanks
Water & Wastewater: Pump sumps, equalization basins, chemical dosing tanks
Food & Beverage: Storage silos for liquids, mixing tanks
The VEGA FLEX 81 integrates seamlessly with various control systems via multiple communication protocols:
| Protocol | Description |
|---|---|
| 4–20 mA / HART® | Most common; provides analog signal with digital communication overlay |
| Profibus® PA | Digital bus communication for process automation |
| FOUNDATION™ Fieldbus | Digital bus with advanced control capabilities |
| VEGA Inventory System | Cloud-based remote monitoring solution (available with optional module) |
Contact：IDA
Phone：15295036218
E-mail：ida@yuhangproducts.com
Add：Changzhou, Jiangsu Province, China
IDA