VEGAFLEX 81 TDR Level Transmitter
Overview
The VEGAFLEX 81 is a guided radar (TDR) level transmitter for continuous level measurement in liquids and bulk solids, part of the VEGA level instrument family. It provides reliable measurement even under difficult process conditions such as foam, steam, and changing media properties.
With a 4-20 mA/HART output and SIL qualification, the VEGAFLEX 81 integrates directly into process control and safety systems, providing the level signal required for inventory, control, and overfill protection duties.
Engineering & Design
The guided radar measuring principle sends a radar pulse along a probe immersed in the medium and measures the reflected signal to determine the level. The 316L rod probe construction provides corrosion resistance for process media, and the transmitter housing with IP66/IP67 protection suits outdoor and process plant installations.
The two-wire 4-20 mA/HART electronics support standard process control integration, and the optional PLICSCOM display module allows on-site configuration and reading. The transmitter is designed for continuous operation in demanding industrial environments.
Key Features
- Guided radar (TDR) level measurement
- Continuous measurement in liquids and bulk solids
- 4-20 mA/HART output with SIL qualification
- 316L rod probe construction
- Reliable measurement with foam, steam, and changing media
- IP66/IP67 housing protection
- Optional PLICSCOM display module
- Two-wire electronics for simple integration
Applications
- Liquid level measurement in process tanks
- Bulk solids level monitoring
- Overfill protection duties
- Chemical and petrochemical plants
- Water and wastewater level control
- Inventory management and control
Specifications
| Specification | Value |
|---|---|
| Manufacturer | VEGA |
| Model | VEGAFLEX 81 |
| Measuring Principle | Guided radar (TDR) |
| Output | 4-20 mA/HART, SIL qualified |
| Probe Material | 316L rod |
| Media | Liquids and bulk solids |
| Housing Protection | IP66/IP67 |
| Display | PLICSCOM (optional) |
| Electronics | Two-wire 4-20 mA/HART |
Process level measurement needs a dependable instrument, and the VEGAFLEX 81 TDR level transmitter is a proven choice, which is why Seven Star LLC supplies the VEGAFLEX 81 level transmitter for process applications.
The VEGAFLEX 81 TDR level transmitter measures the level of the liquid and the interface with the time domain reflectometry along the rod probe. The instrument is mounted on the tank top and the probe length is ordered for the tank height of the application. The measured value is output as the 4-20 mA loop with HART, and the sensor is suitable for the continuous level control of the storage tanks.
The VEGAFLEX 81 sensor is adjusted with the linearization table for the tank geometry when the measurement is used for the volume output. The HART communicator reads the level and the distance values of the instrument during the commissioning. The sensor is suitable for the interface measurement when the second echo is evaluated and the medium constant is set for the product. The installation is verified with the echo curve at the tank site.
The VEGAFLEX 81 is also available with the cable probe for the tall silos and the bypass chambers of the level application. The instrument is protected against the false echo of the agitator with the suppression table of the sensor. The replacement transmitter is parameterized from the stored configuration and the echo curve verifies the measurement at the site.
The VEGAFLEX 81 level transmitter is configured with the suppression table for the false echoes of the tank.
Why Seven Star LLC
Seven Star LLC supplies the VEGAFLEX 81 TDR level transmitter for process level projects across the Gulf, with verified specifications and technical support. Our team assists with probe selection, configuration, and integration with control systems.
We serve oil and gas, chemical, water, and process industries with reliable B2B supply of level instrumentation throughout the GCC.
Process Performance
Guided radar measurement works reliably in conditions that defeat other technologies, including foam, steam, and changing media properties, because the measurement is based on the radar pulse time of flight rather than medium properties. The 4-20 mA/HART output with SIL qualification supports both control and overfill protection duties.
The 316L probe and IP66/IP67 housing suit the demanding environments of chemical and process plants, and the two-wire electronics keep wiring simple and cost-effective.
Request a Quote for VEGAFLEX 81 TDR LEVEL TRANSMITTER
For the VEGAFLEX 81 level transmitter, VEGAFLEX 81 TDR or any related control and instrumentation requirement, contact the Seven Star LLC team. Submit a formal inquiry through our RFQ page with your measurement range, connection and configuration, and our specialists will respond with a detailed commercial proposal and the official VEGAFLEX documentation.
Configuring the VEGAFLEX 81 for Your Vessel
VEGAFLEX instruments are built to order, and a correct specification avoids site modifications later. When requesting a unit, define:
- Probe type and length: rod probes suit most clean process tanks; cable and coaxial versions exist for very tall vessels or low-dielectric media. State the length from the sealing face of the process connection.
- Process connection: thread or flange size, pressure rating and face type to match the nozzle.
- Process conditions: maximum temperature and pressure, the medium and whether interface measurement is needed.
- Approvals: hazardous-area certification for the installation zone, and SIL requirements if the loop is part of a safety function.
- Housing and display: housing material, cable entries and whether a PLICSCOM display is required for local setup.
Setup and Commissioning
The transmitter can be configured locally with the PLICSCOM module, or remotely over HART using PACTware with the VEGA DTM or a handheld communicator. The essential parameters are the application (liquid, interface or bulk solid), the medium, and the minimum and maximum adjustment distances. After mechanical installation, run a false signal suppression with the vessel as empty as practical, so fixed reflections from nozzles, struts and heating coils are learned and ignored. Before handover, compare the reading with an independent level reference and store the echo curve as a baseline.
Troubleshooting
- Reading stuck near the top: often a reflection from a narrow or long nozzle, or build-up at the process connection. Repeat false signal suppression or inspect the nozzle.
- Unstable level with turbulence: check that the probe is not swinging into internals; secure the rod end or install a stilling well where possible.
- Loss of signal at low level: verify the probe length setting and medium parameters; low-dielectric products give a weaker echo.
- Error message on the display: read the status over HART first. VEGA devices report diagnostics in line with NAMUR NE 107, which helps separate process issues from device faults.
Applications in Oman and the GCC
The VEGAFLEX 81 is well suited to crude, diesel and condensate storage, oil–water interface in separators and skimming tanks, chemical storage and dosing in desalination plants, and process vessels in petrochemical units. Its SIL qualification makes it a candidate for high-level alarm and overfill protection loops on hydrocarbon tanks.
Sourcing Through Seven Star LLC
Send us your process data sheet or the order code of an existing unit. We will confirm the configuration and supply genuine VEGA instruments with manufacturer documentation and certificates.
Related Products
- Brochure VEGAFLEX 81 TDR LEVEL TRANSMITTER Catalog Download
VEGA product families on this page
VEGA product names state the measuring principle:- VEGAPULS: non-contact radar level sensors, including VEGAPULS 6X, VEGAPULS 64, VEGAPULS 69 and the compact VEGAPULS C21
- VEGAFLEX 81 and 86: guided wave radar level sensors, and VEGAPASS 81, a bypass tube that is combined with a VEGAFLEX to measure outside the vessel
- VEGASWING 61 and 63: vibrating fork level switches for liquids
- VEGAPOINT 21: compact capacitive point level switch
- VEGABAR 82: process pressure transmitter with ceramic measuring cell
- VEGADIS 176: external display for 4-20 mA loops
Where VEGA sensors and transmitters are used
VEGA level transmitters are common on crude and product tanks, separators, chemical storage, water and wastewater basins, and cement or aggregate silos across the GCC. Vibrating switches serve as overfill and dry-run protection on pumps and vessels. VEGA pressure transmitters measure process pressure and hydrostatic level in liquids and gases.Ordering VEGA instruments: what we need
A VEGA device is fully described by its order code and serial number. A code such as FX81.ICEAIFAXKMAM starts with the device type (FX81 is a VEGAFLEX 81, PS64 a VEGAPULS 64, B82 a VEGABAR 82) and continues with letters for approval, process fitting, seal, electronics and housing. Send that code, or the serial number from the type label, and we can check the exact build in VEGA documentation. For a new point, add the medium, vessel height, nozzle size, pressure, temperature and area classification.Browse VEGA products by category: Level Transmitter, Pressure Instrumentation.
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