80GHz FMCW Radar Level Transmitter for Long-Range Measurement up to 120m

Tall silos, huge storage tanks and deep reservoirs push level instruments to their limits, where beam spread, signal loss and echo interference turn ordinary radars into unreliable guessers. The QWRD80G622 80GHz FMCW radar level transmitter delivers ±1mm accuracy over ranges up to 120 meters, giving operators precise, dependable level data on the largest vessels in the plant.

Why Do You Need an 80GHz FMCW Radar for Long Ranges?

Long-range level measurement is unforgiving. At 60 or 100 meters, a radar with a wide beam angle illuminates the tank wall, pipes and obstructions, creating false echoes that corrupt the reading. Low-frequency radars also lose accuracy at extreme distances, and their large antennas are heavy and expensive to mount on tall silos. The 80GHz frequency band solves these problems: the shorter wavelength produces a narrow, focused beam that avoids obstructions, and FMCW technology measures the frequency difference of the reflected signal to calculate distance with millimeter precision. For cement silos, grain elevators, LNG tanks and water reservoirs, an 80GHz FMCW radar is the technology that keeps working where other instruments fail.

Working Principle: Frequency-Modulated Continuous Wave

The QWRD80G622 transmits a continuous microwave signal whose frequency sweeps linearly over time. The signal reflects off the product surface and returns to the antenna, and the electronics compare the frequency of the returned signal with the transmitted signal at the same instant. The frequency difference is directly proportional to the distance to the surface, so the level is calculated with very high resolution. This FMCW principle, combined with the 80GHz band, gives the transmitter its ±1mm accuracy and stable performance even with dust, steam, condensation and agitation. The measured value is delivered through 4-20 mA, HART or RS485 MODBUS outputs for integration with any control system.

Structural Advantages of the QWRD80G622

• ±1mm measurement accuracy: precision that supports custody-grade inventory control.
• 0-120 m measuring range: covers the tallest silos and largest tanks.
• 80GHz FMCW technology: narrow beam, no false echoes, immune to dust and steam.
• Multiple outputs: 4-20 mA, HART and RS485 MODBUS in one instrument.
• SS304 material: corrosion-resistant housing for industrial service.
• Non-contact measurement: no moving parts, no media contact, minimal maintenance.
• OEM/ODM/OBM support: including software re-engineering for special projects.
• Range options 30 m / 35 m / 85 m / 120 m: matched to your vessel height.

Pain Point Analysis: 2 Challenging Working Conditions

Application Cases

Product Advantages

• ±1mm accuracy for precise inventory and control
• Up to 120 m measuring range
• 80GHz FMCW technology with narrow beam
• Reliable in dust, steam and condensation
• 4-20 mA, HART and RS485 MODBUS outputs
• SS304 corrosion-resistant construction
• Non-contact, maintenance-free operation
• OEM/ODM/OBM and software customization

Technical Parameters

SEO FAQ

Q1: What is the difference between FMCW and pulse radar level measurement?

Pulse radar transmits short microwave pulses and measures the time delay of the reflected pulse to calculate distance. FMCW (frequency-modulated continuous wave) radar transmits a continuous signal whose frequency sweeps linearly, and measures the frequency difference between the transmitted and received signals, which is proportional to distance. FMCW offers higher resolution and better signal processing, especially in demanding conditions such as dust, steam and condensation, and it is less affected by weak or noisy echoes. The QWRD80G622 uses 80GHz FMCW technology, which is why it achieves ±1mm accuracy over ranges up to 120 meters, performance that pulse radars find difficult to match.

Q2: Why choose 80GHz over lower-frequency radar?

The 80GHz band offers three decisive advantages. First, the shorter wavelength produces a much narrower beam angle, so the radar sees the product surface directly below it rather than illuminating tank walls and obstructions that create false echoes. Second, the higher frequency provides better reflection from liquid surfaces and powders, improving signal strength. Third, the smaller antenna required at 80GHz is lighter and easier to install on tall silos and existing nozzles. For long ranges, dusty atmospheres and confined nozzles, 80GHz radar delivers accuracy and reliability that 6GHz or 26GHz instruments cannot match.

Q3: How does the transmitter handle dust and steam?

Dust and steam scatter and attenuate microwave signals, which is the most common cause of radar failure in silos and process vessels. The 80GHz high-frequency signal of the QWRD80G622 penetrates dust clouds and steam atmospheres far better than lower frequencies, because the short wavelength is less affected by the particles and vapor droplets. The FMCW signal processing additionally analyzes the complete frequency spectrum of the return, allowing the electronics to identify the true product echo among noise. Together, these features keep the level reading stable even during pneumatic filling of silos and in vessels with heavy condensation.

Q4: What outputs are available for integration?

The QWRD80G622 provides 4-20 mA analog output with HART digital communication, plus RS485 MODBUS, giving complete flexibility for integration. The 4-20 mA signal connects directly to PLC analog inputs and DCS systems, while HART allows remote configuration, diagnostics and digital process values over the same two wires. The RS485 MODBUS interface supports digital networking, multi-drop connections and direct communication with SCADA systems and computers. This combination means the transmitter can be integrated into virtually any control architecture, from simple single-tank monitoring to plant-wide automation networks.

Q5: What customization options are available?

As the manufacturer, we offer extensive customization for the QWRD80G622. Standard range options are 30 m, 35 m, 85 m and 120 m, and we support OEM, ODM and OBM programs including custom labeling, packaging, special process connections and documentation. Notably, we also offer software re-engineering services, allowing the transmitter firmware and signal processing to be adapted for special applications. With a monthly supply capacity of 100 pieces and delivery within 5-8 working days, we support both single-unit projects and series production. Contact us with your vessel dimensions and application details for a recommendation.

Why Choose Our 80GHz Radar Level Transmitter?

The QWRD80G622 is engineered for the applications that defeat ordinary level instruments: extreme ranges, dusty atmospheres and demanding accuracy requirements. Its 80GHz FMCW technology, ±1mm accuracy, 120-meter range and flexible HART/MODBUS outputs make it the professional choice for silos, tanks and reservoirs, backed by SS304 construction and direct manufacturer support. When your vessel is tall and your accuracy requirements are higher, choose the radar that reaches further and measures truer.