VEGAFLEX 81 Guided Wave Radar Level Sensor
Part number FX81.CXAGEDHAMAX
Guided-wave radar for liquid level and interface, rod or cable probe to 75 m, ±2 mm accuracy, dielectric constant from 1.6, -196…+450 °C versions, SIL2/3.
- CE
- ATEX
- IECEx
- SIL2
- HART 7
Overview
VEGAFLEX 81 is VEGA's guided-wave (TDR) radar for liquids, used where non-contact radar struggles: low-dielectric hydrocarbons, bypass chambers, foam and tanks with internal obstructions. Rod and coaxial probes cover short vessels; cable probes reach 75 m in deep tanks. It measures interface between two liquids and also reports the total level. Temperature and pressure versions span -196 °C cryogenic to +450 °C and 400 bar, with second-line-of-defence sealing. Like all plics sensors it is commissioned via Bluetooth with the VEGA Tools app and shares the PLICSCOM display; SIL2/3 qualification covers overfill and safety loops. The example code is a rod-probe HART unit with 316L process connection.
Key features
- Guided-wave radar for level and interface; rod, coaxial or cable probe up to 75 m
- Accuracy ±2 mm; dielectric constant from 1.6 (1.4 with probe-end tracking)
- High-temperature/pressure versions -196…+450 °C, up to 400 bar with second line of defence
- Measures reliably in bypass chambers, stilling wells and foaming products
- 4–20 mA HART 7, PROFIBUS PA, FF; SIL2 (SIL3 redundant); ATEX, IECEx, FM, CSA
Typical applications
- Oil/water interface in separators and desalters
- Level in bypass chambers replacing displacers
- LPG, LNG and cryogenic vessels
- Boiler drums and high-pressure vessels
Technical specifications — FX81.CXAGEDHAMAX
| Measurement | |
|---|---|
| Measuring principle | Guided-wave radar (TDR) |
| Probe types | Rod (to 6 m), coaxial, cable (to 75 m) |
| Accuracy | ±2 mm |
| Dielectric constant | ≥1.6 (≥1.4 with probe-end tracking) |
| Interface | Yes, with upper layer εr ≤ 10 |
| Output | |
| Signal | 4–20 mA HART 7, PROFIBUS PA, FF |
| Display | PLICSCOM with Bluetooth |
| Power | 9.6–35 V DC two-wire |
| Process | |
| Process temperature | -196…+450 °C (version dependent) |
| Process pressure | -1…+400 bar |
| Process connection | Threads G3/4–1-1/2, flanges, hygienic |
| Wetted materials | 316L, Alloy C-22, PTFE, PFA, ceramic |
| Environment | |
| Ambient temperature | -40…+80 °C |
| Enclosure | IP66/67, aluminium or 316L housing |
Specifications are summarised from the manufacturer's documentation for selection purposes. Always confirm against the current datasheet before design-in; we send the datasheet and the exact ordering code with every quotation.
Related part numbers and alternatives
| Part number | Relationship | |
|---|---|---|
VEGAFLEX 86 | High-temperature/high-pressure version with ceramic feed-through for steam drums | Quote |
VEGAFLEX 83 | Hygienic PFA-coated version for food and pharma | Quote |
VEGAPULS 64 | Non-contact 80 GHz radar when probe contact is not acceptable | Quote |
Not sure which variant you need? Send us the nameplate photo or the old part number and we will identify the current equivalent.
Supply, documentation and lead time
What you receive
- Genuine VEGA product in original packaging
- Commercial invoice and packing list; Certificate of Conformance on request
- Datasheet, declaration of conformity and country of origin as issued by the manufacturer
- Manufacturer warranty, period stated on the quotation
How we quote
- Reply within one business day with price, lead time and stock position
- Alternatives proposed when they improve price or delivery
- Incoterms of your choice: EXW Hai Phong, FOB/FCA, CIF/DAP to your site
- Consolidated shipments for multi-line orders; export documentation for buyers outside Vietnam
Indicative HS code 9026.10 — final classification is confirmed on the commercial invoice.
Frequently asked questions
When is guided-wave radar better than non-contact radar?
When the product has a very low dielectric constant (LPG, solvents), when a bypass chamber or stilling well is used, when there is dense foam, or when interface between two liquids must be measured. Non-contact radar is preferred for aggressive products, agitated vessels and where a probe cannot be installed.
Can the probe be shortened on site?
Yes. Rod and cable probes can be cut to length during installation and the sensor re-parameterized; we also supply pre-cut probes to the dimension you specify.
Is the VEGAFLEX 81 available from stock, and what is the lead time?
Typical factory lead time is 2–4 weeks; HTHP versions longer. We confirm with the quotation.