VEGA VEGAPULS C21 Compact Radar Level Sensor

Overview

The VEGA VEGAPULS C21 is a compact, wired radar sensor for continuous non-contact level measurement, purpose-built for water treatment, pumping stations, and open-channel flow monitoring. Its compact plastic housing and 80 GHz radar technology combine maintenance-free operation with the precision required for demanding water and wastewater applications.

Working closely with plant engineers in the region, Seven Star LLC proudly supplies the VEGA VEGAPULS C21 to water utilities and municipal 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 VEGAPULS C21 operates with a continuous, frequency-modulated radar signal at 80 GHz. A microwave signal is emitted toward the liquid or bulk solid surface, reflects, and returns to the sensor; the frequency difference between the emitted and the received signal is proportional to the distance and is converted into the level reading, entirely independent of contact with the measured medium.

Because the sensor is non-contact and maintenance-free, it delivers reliable readings in open channels, wet wells, and rain overflow basins where fouling, turbulence, and debris commonly disrupt other measurement technologies. Its 8 degree beam angle provides good signal focusing for a compact sensor, and the design supports both liquid level and small bulk solids applications.

Engineering Design of the VEGA VEGAPULS C21

The sensor measures ranges up to 20 m with an accuracy of ±2 mm, in a compact PVDF housing rated IP66/IP68 (3 bar) with a PVDF process fitting available in G1-1/2, 1-1/2 NPT, or R1-1/2 threads. It is rated for process temperatures from –40°C to +80°C, making it well suited to outdoor water and wastewater installations.

Communication is available via 4–20 mA, HART, SDI-12, or Modbus, with Bluetooth built in as standard for wireless configuration and diagnostics from up to 25 m away using a smartphone or tablet, eliminating the need to open the housing for routine adjustment.

Key Features

The VEGA VEGAPULS C21 is engineered for reliable, low-maintenance level measurement, and the VEGA VEGAPULS C21 is a proven solution across water and wastewater infrastructure throughout the region:

• Delivers measurement accuracy of ±2 mm across measuring ranges up to 20 m.
• Uses 80 GHz radar with an 8 degree beam angle in a compact sensor package.
• Includes standard Bluetooth connectivity for wireless setup and diagnostics up to 25 m away.
• Supports 4–20 mA, HART, SDI-12, or Modbus output for flexible system integration.
• Handles process temperatures from –40°C to +80°C for outdoor and exposed installations.
• Achieves IP66/IP68 (3 bar) and Type 6P protection in a robust, compact PVDF housing.
• Suits both liquid level measurement and small bulk solids silo applications.
• Is maintenance-free thanks to its fully non-contact measuring principle.

Industrial Applications

The VEGA VEGAPULS C21 is specified for water treatment plants, pumping stations, rain overflow basins, open-channel flow measurement, and small bulk solids silos or containers. Its compact size and Bluetooth configuration make it especially practical for municipal utilities managing large numbers of monitoring points across a network.

With fast quotation turnaround and technical support, Seven Star LLC supplies the VEGAPULS C21 to water and wastewater utilities throughout Oman and the GCC, including projects in the Sohar and Salalah economic zones, municipal pumping stations, and desalination plants, with lead time confirmed at quotation and technical support with selection.

Technical Specifications

Key technical parameters for the VEGA VEGAPULS C21 are summarized below.

VEGAPULS C21 measuring range, pressure limits and enclosure

The current VEGA specification sheet for the VEGAPULS C 21 (edition November 2024) states a measuring range of up to 20 m with a deviation of ±2 mm and a beam angle of 8 degrees. The device works in the W-band with 80 GHz technology and emits a continuous, frequency-modulated radar signal; the frequency difference between emitted and received signal is proportional to the distance.

Process pressure is specified as -1 to +3 bar, and both process and ambient temperature as -40 to +80 °C. The housing is made of PVDF and optimised for water and waste water service; with its encapsulated cable gland it reaches IP66/IP68 (3 bar, 24 h) according to IEC 60529 and Type 4X/6P according to UL 50. Wetted parts are PVDF and the process seal is FKM.

VEGAPULS C21 electronics versions, wiring and adjustment

VEGA offers three electronics versions: two-wire 4 to 20 mA/HART, and two digital versions with SDI-12 and with Modbus/Levelmaster protocol. The two-wire version operates on 12 to 35 V DC. The connection cable is permanently attached and PUR insulated, with the brown wire as plus, the blue wire as minus and a shield. Besides the G1-1/2, 1-1/2 NPT and R1-1/2 process threads there is a mounting connection in G1, 1 NPT or R1.

Adjustment is possible through the signal cable using the VEGACONNECT interface adapter and a PC with PACTware and the matching DTM, or wirelessly on the Bluetooth version using a smartphone, tablet or Windows PC. The specification sheet names Bluetooth 5.0 with a typical range of 25 m. Listed explosion protection types are intrinsic safety, dust ignition protection and encapsulation; WHG and VLAREM II overfill approvals are also listed.

Why Choose Seven Star LLC for VEGA Compact Radar Level Sensors

A water utility deploying VEGAPULS C21 sensors across dozens of pumping stations and monitoring points benefits most when procurement, Bluetooth commissioning, and spare-sensor planning are coordinated together rather than handled one point at a time. Seven Star LLC supports municipal and wastewater utilities across Oman and the GCC with batch ordering and consistent configuration guidance for VEGAPULS C21 deployments, drawing on our trusted VEGA suppliership in the region. We also help utility teams in Muscat, Sohar, and Salalah plan remote Bluetooth-based setup and diagnostics for open-channel and wet-well installations that are difficult or unsafe to access physically, keeping large monitoring networks maintainable without repeated site visits. We also help utilities plan process fitting selection (PVDF, NPT, or metric thread) consistently across a network so replacement sensors remain interchangeable between sites during future maintenance cycles, and we confirm availability and lead time for common C21 variants at quotation when a single monitoring point needs urgent replacement, and our technical team is available to advise on SDI-12 versus Modbus integration choices depending on the SCADA platform already deployed already in use across your network and facility.

Request a Quote for VEGA VEGAPULS C21 Compact Radar Level Sensor

For water and wastewater monitoring points standardizing on the VEGA VEGAPULS C21, 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. With engineering support in Muscat, contact our instrumentation division today to configure the right VEGAPULS C21 variant for your application, complete with manufacturer documentation.

Related Products

• VEGAPULS 69 Radar Level Transmitter
• Anderson-Negele L3 Continuous Hygienic Level Sensor
• VEGASWING 61 Vibrating Level Switch
• ABB-Guided Wave Radar Level Transmitter MT5000
• VEGA VEGAFLEX 86 Guided Wave Radar Level Sensor
• Tecfluid LT-R153 – Magnetic Level Transmitter with Switch

Also available: VEGA VEGADIS 176 External Display for 4-20mA Loops