VEGA VEGAFLEX 86 Guided Wave Radar Level Sensor

Overview

The VEGA VEGAFLEX 86 is a guided wave radar (TDR) sensor for continuous level and interface measurement of virtually all liquids under extreme pressure and temperature conditions. Its robust mechanical design and second process seal, known as the Second Line of Defense, protect the sensor through the most demanding measurement tasks in the chemical, petrochemical, energy, and oil and gas sectors.

With engineering support in Muscat, Seven Star LLC supplies the VEGA VEGAFLEX 86 to refineries and process plants across the Sultanate of Oman and the wider GCC, with manufacturer documentation and local technical support.

Measurement Principle

The VEGA VEGAFLEX 86 operates on the time-domain reflectometry (TDR) principle. High-frequency microwave pulses are coupled onto a cable, rod, or coaxial probe and guided along its length; the pulse reflects off the product surface, and the time from emission to reception is measured and converted directly into level or interface position.

Because the signal travels along a physical probe, the VEGAFLEX 86 operates independently of media properties such as density or dielectric constant, delivering precise and reliable measured values even with buildup, foam generation, and condensation present. In saturated steam applications, a special reference probe ensures density-independent measurement, and the sensor can resolve the interface between two liquids with different dielectric constants, such as oil and water.

Engineering Design of the VEGA VEGAFLEX 86

The VEGAFLEX 86 is available with coax probes of 21.3 mm or 42.2 mm diameter, exchangeable rod probes of 16 mm, or exchangeable cable probes of 2 mm or 4 mm with gravity or centering weights, covering measuring ranges up to 75 m. It is rated for process temperatures from –196°C to +450°C and pressures from –1 to +400 bar, with accuracy of ±2 mm, and wetted materials in 316L, 316, or Alloy C22.

Shortenable probes offer simple standardization and maximum flexibility during project planning, while guided adjustment enables a simple, time-saving, and reliable setup process. Comprehensive diagnostic capabilities ensure maintenance-free operation, and threaded connections from G3/4 or flange connections from DN25 accommodate a wide range of vessel types.

Key Features

The VEGA VEGAFLEX 86 is engineered for extreme process conditions, and the VEGA VEGAFLEX 86 is a proven solution across refining, petrochemical, and energy applications throughout the region:

• Handles process temperatures up to +450°C and pressures up to 400 bar in a single sensor.
• Delivers measurement accuracy of ±2 mm across measuring ranges up to 75 m.
• Remains reliable with buildup, foam generation, and condensation in the vessel.
• Measures interface levels between two liquids of differing dielectric constant, such as oil and water.
• Includes a special reference probe for density-independent measurement in saturated steam.
• Features a second process seal, the Second Line of Defense, for enhanced process safety.
• Offers shortenable probes for simple standardization and flexible project planning.
• Is available with ATEX and IECEx hazardous-area certifications for Zone 1 and Zone 2 installations.

Industrial Applications

The VEGA VEGAFLEX 86 is specified for level and interface measurement in distillation columns, level measurement in steam boilers and LPG gas tanks, and interface profiling in offshore oil separators with emulsion layers. Its high-pressure, high-temperature rating makes it a default choice for reboilers, depropanizers, and other demanding refinery and petrochemical vessels.

With manufacturer documentation, Seven Star LLC supplies the VEGAFLEX 86 to refining and process facilities throughout Oman and the GCC, including projects in the Sohar and Salalah economic zones, offshore oil and gas platforms, and petrochemical complexes, with lead time confirmed at quotation and technical support with selection.

Technical Specifications

Key technical parameters for the VEGA VEGAFLEX 86 are summarized below.

VEGAFLEX 86 probe versions and process connections

VEGA lists three coax versions for the VEGAFLEX 86: 21.3 mm diameter with multiple holes, and 42.2 mm diameter with single hole or with multiple holes. In addition there is an exchangeable rod of 16 mm diameter and exchangeable cables of 2 mm or 4 mm, each with gravity weight or centering weight. The specification sheet gives measuring ranges of up to 75 m for the cable probe and up to 6 m for the rod probe.

Threaded connections start at G3/4 and 3/4 NPT and flanges at DN25 and 1 inch. The seal toward the process is made of FFKM or of graphite and ceramic, and wetted metal parts are 316L, 316 or Alloy C22 (2.4602). The specification sheet for the rod and cable versions distinguishes two temperature designs, one for -196 to +280 °C and one for -196 to +450 °C.

VEGAFLEX 86 electronics, housings and safety approvals

Electronics are available as two-wire 4 to 20 mA/HART, four-wire 4 to 20 mA/HART, Profibus PA, Foundation Fieldbus and Modbus. The two-wire HART version operates on 9.6 to 35 V DC. Housings come as single or double chamber designs in plastic, aluminium or stainless steel, with protection ratings of IP66/IP67, IP66/IP68 (0.2 bar) or IP66/IP68 (1 bar). Ambient, storage and transport temperature is -40 to +80 °C.

VEGA lists SIL2 qualification, WHG and VLAREM II overfill protection and a steam boiler approval according to EN 12952-11 and EN 12953-9. Explosion protection is offered as intrinsic safety, flameproof enclosure and dust ignition protection, with approval scopes including ATEX, IEC, FM, CSA, UKEX, NEPSI, INMETRO and CCOE. Adjustment is carried out with the PLICSCOM display and adjustment module, PACTware with DTM, or a HART communicator.

Why Choose Seven Star LLC for VEGA Guided Wave Radar Level Sensors

Specifying a guided wave radar for the most demanding vessels in a plant — reboilers, distillation columns, high-pressure separators — means matching probe type, wetted material, and the Second Line of Defense seal rating to conditions that can reach 450 degrees Celsius and 400 bar, where a wrong choice is not a minor inconvenience but a genuine safety and reliability risk. Seven Star LLC works closely with your process safety engineers to confirm the correct VEGAFLEX 86 probe style and pressure-temperature rating for your actual vessel conditions before shipment, backed by our trusted VEGA suppliership across Oman and the wider GCC. We also support refineries and petrochemical plants in Sohar and Salalah with interface-measurement configuration guidance for oil-water or emulsion-layer applications, and coordinate ATEX/IECEx-certified deliveries for Zone 1 and Zone 2 hazardous-area installations, so critical column and separator instrumentation is specified correctly the first time, without costly rework after commissioning.

Request a Quote for VEGA VEGAFLEX 86 Guided Wave Radar Level Sensor

For high-pressure, high-temperature vessels standardizing on the VEGA VEGAFLEX 86, Seven Star LLC is ready to support your project with a formal RFQ, technical datasheet, and delivery timeline. Our instrumentation engineers provide technical support with selection across Oman and the GCC, with lead time confirmed at quotation. Working closely with plant engineers in the region, contact our instrumentation division today to configure the right VEGAFLEX 86 probe type for your application, complete with genuine calibration certificates and full documentation.

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