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Brand: VEGA
VEGA VEGAPASS 81 Guided Wave Radar Bypass Interface Sensor
Description
Overview
The VEGA VEGAPASS 81 is a bypass standpipe engineered to work in combination with a VEGAFLEX guided wave radar sensor, enabling continuous level and interface measurement outside the vessel. The bypass is mounted as a communicating vessel laterally to the tank via two process fittings, ensuring that the level in the standpipe always matches the level inside the vessel.
With fast quotation turnaround and technical support, Seven Star LLC proudly supplies the VEGA VEGAPASS 81 to refineries and process facilities across the Sultanate of Oman and the wider GCC, backed by genuine factory calibration, full documentation, and local technical support.
Measurement Principle
The VEGA VEGAPASS 81 itself is a mechanical bypass structure; measurement is performed by a VEGAFLEX guided wave radar sensor mounted on top of the standpipe using the time-domain reflectometry (TDR) principle. A microwave pulse travels down the probe inside the standpipe, reflects off the liquid surface, and the transit time is converted into an accurate level or interface reading that mirrors the condition inside the main vessel.
Because the standpipe isolates the measurement from turbulence, agitation, and internal obstructions in the main vessel, the combination is unaffected by shifts in pressure, temperature, or product specific gravity. This makes the VEGAPASS 81 particularly valuable for aggressive liquids and vessels where direct top-mounted sensor installation is impractical or where external, serviceable access is preferred.
Engineering Design of the VEGA VEGAPASS 81
The VEGAPASS 81 is manufactured in stainless steel to meet a wide range of pipe and process connection standards, with a measuring range of up to 4 m, process temperatures from –196°C to +450°C, and process pressures from 0 to 205 bar. This wide operating envelope allows it to serve both standard process vessels and demanding high-temperature, high-pressure applications.
The bypass is designed for straightforward mounting via two lateral process connections to the vessel, and is available with ATEX and IECEx hazardous-area certifications for Zone 1 and Zone 2 installations, making it suitable for both safe-area and explosive-atmosphere duty typical of oil, gas, and chemical facilities.
Key Features
The VEGA VEGAPASS 81 is engineered as a robust external measurement solution, and the VEGA VEGAPASS 81 is a proven choice wherever direct in-vessel sensor mounting is impractical:
- Enables continuous level and interface measurement outside the vessel via a stainless steel bypass standpipe.
- Handles process temperatures from –196°C to +450°C and pressures from 0 to 205 bar.
- Remains unaffected by shifts in pressure, temperature, or product specific gravity.
- Isolates the measurement from turbulence and internal obstructions in the main vessel.
- Provides a measuring range of up to 4 m per bypass section.
- Is available with ATEX and IECEx certifications for Zone 1 and Zone 2 hazardous areas.
- Simplifies maintenance access compared to internally mounted sensors.
- Pairs directly with VEGAFLEX guided wave radar sensors for a complete measurement solution.
Industrial Applications
The VEGA VEGAPASS 81 is specified for aggressive liquid storage vessels, refinery and petrochemical process tanks, and applications where a top-mounted in-vessel probe cannot be installed due to internal fittings, agitation, or access constraints. Its wide temperature and pressure ratings also suit high-severity separator and column applications in oil and gas processing.
With engineering support in Muscat, Seven Star LLC supplies the VEGAPASS 81 to refining and process facilities throughout Oman and the GCC, including projects in the Sohar and Salalah economic zones, offshore platforms, and chemical processing plants, with lead time confirmed at quotation and technical support with selection.
Technical Specifications
Key technical parameters for the VEGA VEGAPASS 81 are summarized below.
| Parameter | Specification |
|---|---|
| Model | VEGA VEGAPASS 81 |
| Type | Bypass standpipe for guided wave radar |
| Measuring Range | Up to 4 m |
| Process Temperature | –196°C to +450°C |
| Process Pressure | 0 to 205 bar |
| Material | Stainless steel |
| Compatible Sensor | VEGAFLEX guided wave radar series |
| Approvals | ATEX, IECEx (Zone 1, Zone 2) |
Why Choose Seven Star LLC for VEGA Bypass Level Measurement Systems
A bypass standpipe only makes sense when direct in-vessel sensor mounting is genuinely impractical — due to agitators, internal fittings, or access constraints — and choosing the right VEGAFLEX sensor to pair with the VEGAPASS 81, along with the correct material and pressure rating for the standpipe itself, requires understanding your actual vessel layout, not just its nominal specifications. Seven Star LLC reviews vessel configuration with your engineering team to confirm whether a bypass or direct-mount solution better suits your application, and specifies the correct VEGAPASS 81 and VEGAFLEX combination accordingly, drawing on our trusted VEGA suppliership across Oman and the wider GCC. We also support refineries and offshore platforms across Oman and the GCC with coordinated delivery of complete bypass-and-sensor assemblies, along with ATEX/IECEx documentation for hazardous-area installations, reducing coordination effort on projects where multiple components must arrive and integrate together, and helping avoid the scheduling delays that come from ordering a bypass and its sensor from separate suppliers on separate timelines.
Request a Quote for VEGA VEGAPASS 81 Guided Wave Radar Bypass Interface Sensor
For vessels requiring external, isolated level and interface measurement, Seven Star LLC is ready to support your project with a formal RFQ, technical datasheet, and delivery timeline for the VEGA VEGAPASS 81. Our instrumentation engineers provide technical support with selection across Oman and the GCC, with lead time confirmed at quotation. Backed by manufacturer datasheet documentation, contact our instrumentation division today to configure the right VEGAPASS 81 and VEGAFLEX combination for your application, complete with genuine calibration certificates and full documentation.
Related Products
Datasheets & Documents
- Datasheet VEGA VEGAPASS 81 Guided Wave Radar Bypass Interface Sensor Datasheet Download
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About brand
VEGA is a German maker of level and pressure instruments. Bruno Grieshaber founded the company in 1959 in Triberg in the Black Forest, and it has been based in Schiltach since 1975, still family owned as VEGA Grieshaber KG. VEGA is best known for radar level sensors: it introduced the first two-wire radar level sensor in 1997 and the first 80 GHz radar sensor for bulk solids, the VEGAPULS 69, in 2015.
Seven Star LLC is an independent supplier listing VEGA radar and guided wave radar transmitters, point level switches, pressure transmitters and signal conditioning instruments for buyers in Oman and the GCC. Sensors are matched from the product code on the type label.
VEGA at a glance
| Origin | Founded by Bruno Grieshaber in 1959 in Triberg, Germany |
|---|---|
| Headquarters | Schiltach, Black Forest, Germany (since 1975) |
| Ownership | Family-owned company: VEGA Grieshaber KG |
| Milestones | First two-wire radar level sensor (1997), first 80 GHz radar for bulk solids, VEGAPULS 69 (2015), VEGAPULS 6X single radar platform for liquids and solids |
| Product families | VEGAPULS radar, VEGAFLEX guided wave radar, VEGASWING and VEGAPOINT switches, VEGACAL capacitive probes, VEGABAR and VEGADIF pressure, VEGAMET and VEGADIS signal conditioning |
VEGA sensor and instrument series
| Series | Type | Typical use |
|---|---|---|
| VEGAPULS 6X, VEGAPULS 69, VEGAPULS 64 | Process radar level transmitters (80 GHz) | Storage and process tanks, reactors with agitators, silos and bulk solids |
| VEGAPULS 11, 21, 31, 42 | Compact radar sensors | Water and wastewater, simple storage tanks; VEGAPULS 42 with IO-Link for machine integration |
| VEGAPULS C 21, C 11, C 22, C 23 | Radar sensors with fixed cable, IP68 | Wet wells, pumping stations, open channels and river levels |
| VEGAFLEX 81, 82, 83, 86 | Guided wave radar (TDR) | Level and interface in liquids, bulk solids, hygienic and high-temperature or high-pressure service (VEGAFLEX 86) |
| VEGASWING 61, 63, VEGAPOINT 21 | Vibrating and capacitive point level switches | Overfill protection, dry-run protection and high or low level alarms |
| VEGACAL 62 to VEGACAL 67 | Capacitive rod and cable probes | Point and continuous level in solids and conductive or adhesive liquids |
| VEGABAR 82, 83, 28, 29, 38 | Pressure transmitters, ceramic or metallic cell | Process pressure and hydrostatic level; compact 18/19 and 28/29/38 versions for utilities |
| VEGADIF 85 | Differential pressure transmitter | DP flow, filter monitoring and level in pressurised vessels |
| VEGAMET 841, VEGADIS 176 | Controller and loop display | Level display, pump control and remote indication of 4-20 mA signals |
Where VEGA instruments are used
VEGA radar sensors measure level in crude oil and product tanks, separators, chemical reactors, cement and aggregate silos, grain stores and water reservoirs. Compact cable radars are widely used in wastewater pumping stations and flood monitoring. Because 80 GHz radar focuses a narrow beam, it can measure past internal structures in a tank, and it is not affected by the temperature, pressure or vapour above the product, which suits hot Gulf storage tanks.
Ordering VEGA instruments: what we need
The product code on the type label (for example PS64.XXXXXXX) fixes the measuring range, antenna or probe, process connection, electronics and approvals. Send it with the serial number. For a new measurement add the medium and its dielectric constant if known, tank or silo height and internals, process pressure and temperature, process connection, output (4-20 mA HART, PROFIBUS PA, Modbus or IO-Link), and any hazardous-area or overfill protection approval required.
Facts checked against VEGA company and product information, October 2026.
Browse VEGA products by category: Level Transmitter, Pressure Instrumentation, Controllers and Data Acquisition.
FAQ
Questions about the VEGA VEGAPASS 81 Guided Wave Radar Bypass Interface
Answers from our engineering team on installation, compatibility and integration.
01Does the VEGAPASS 81 include its own measurement sensor?
No. The VEGAPASS 81 is a mechanical bypass standpipe; it is paired with a VEGAFLEX guided wave radar sensor mounted on top, which performs the actual level or interface measurement using the TDR principle.
02Why use a bypass instead of a direct in-vessel sensor?
A bypass isolates the measurement from turbulence, agitation, and internal obstructions in the main vessel, and provides easier external access for maintenance compared to a sensor mounted directly inside the tank.
03What process conditions can the VEGAPASS 81 handle?
The VEGAPASS 81 is rated for process temperatures from -196C to +450C and pressures from 0 to 205 bar, covering both standard and demanding high-severity applications.
04Is the VEGAPASS 81 suitable for hazardous-area installations?
Yes. The VEGAPASS 81 is available with ATEX and IECEx hazardous-area certifications for Zone 1 and Zone 2 installations, making it suitable for oil, gas, and chemical facilities.
05Is Seven Star LLC an experienced supply partner for VEGA products?
Yes. Seven Star LLC supplies VEGA products to customers in Oman and the GCC and can provide the manufacturer documentation and technical support on request.
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