26GHz Pulse Radar Level Gauge for Long-Range, High-Accuracy Level Measurement

For operators of tall silos, large tanks and reservoirs, level measurement is a question of range and reliability: the instrument must reach the product surface at extreme distances and return a trustworthy value every time. The QWRD80G608 26GHz pulse radar level gauge delivers ±1mm accuracy over ranges from 30 to 120 meters in a rugged stainless steel housing.

Why Do You Need a Pulse Radar Level Gauge with Long Range?

Tall structures create measurement problems that short-range instruments cannot solve. A 60-meter cement silo, a 100-meter water reservoir or a large LNG tank demands an instrument that transmits a signal strong enough to reach the surface and returns a clean echo from that distance. Pulse radar is the established technology for this duty: it sends a high-energy microwave pulse and times its return, giving a direct, reliable distance measurement without the complexity of continuous wave processing. Combined with the 26GHz band, which provides a focused beam and good reflection from both liquids and solids, the gauge measures accurately at long range while resisting false echoes from walls and structures. For operators who need dependable level data on very tall vessels, a long-range pulse radar is the proven choice.

Working Principle: Time-of-Flight Pulse Radar

The QWRD80G608 transmits short microwave pulses at 26GHz toward the product surface and measures the time it takes for each pulse to travel to the surface and return as an echo. Because the speed of the microwave signal is constant, the round-trip time is directly proportional to the distance to the surface, and the electronics convert this into an accurate level value with ±1mm precision. The 26GHz frequency gives a narrow beam angle that minimizes interference from tank walls and internal structures, while advanced echo processing identifies the true product echo even in dusty or turbulent conditions. The gauge is housed in a stainless steel enclosure, connects via flanges from DN80, is powered as a two-wire DC 24±6 V or four-wire AC 220 V instrument, and outputs 4-20 mA with HART communication.

Structural Advantages of the QWRD80G608

• Pulse radar technology: proven, direct time-of-flight measurement.
• 30-120 m measuring range: reaches the tallest silos and reservoirs.
• ±1mm accuracy: precise values even at extreme distances.
• 26GHz narrow beam: minimizes false echoes from structures.
• Stainless steel housing: corrosion-resistant and rugged.
• Flange connection from DN80: standard industrial mounting.
• Dual power options: two-wire DC24±6V or four-wire AC220V.
• 4-20 mA with HART: standard integration and remote configuration.

Pain Point Analysis: 2 Challenging Working Conditions

Application Cases

Product Advantages

• Proven pulse radar time-of-flight technology
• 30-120 m measuring range
• ±1mm measurement accuracy
• 26GHz narrow beam signal
• Stainless steel rugged housing
• Flange connection from DN80
• Two-wire DC and four-wire AC power options
• 4-20 mA with HART communication

Technical Parameters

SEO FAQ

Q1: How does pulse radar level measurement work?

Pulse radar level measurement works on the time-of-flight principle. The gauge transmits a short, high-energy microwave pulse from its antenna toward the product surface. The pulse travels at the speed of light, reflects off the surface, and returns to the antenna. The electronics measure the round-trip time with high precision, and because the signal speed is constant, this time is directly proportional to the distance to the surface. The level is then calculated by subtracting this distance from the known vessel height. Pulse radar is a mature, proven technology that provides direct, reliable distance measurement with no moving parts and no contact with the product.

Q2: What is the maximum range of this gauge?

The QWRD80G608 measures over a range of 30 to 120 meters, depending on the configuration selected. The 30-meter option suits standard industrial silos and tanks, while the 120-meter option handles the tallest structures found in industry, such as very tall cement silos, water reservoirs and large storage vessels. The high-energy pulse and the 26GHz focused beam maintain a strong, clean echo across the full range, giving reliable readings even at extreme distances. When ordering, specify your vessel height so the gauge is configured with the appropriate range and signal processing for your application.

Q3: Why is a narrow beam important in radar level measurement?

Beam angle determines how much of the transmitted signal spreads sideways from the antenna. A wide beam illuminates the tank walls, roof structures, pipes and agitators, and the reflections from these objects create false echoes that can confuse the level measurement. A narrow beam, such as that produced by the 26GHz frequency, concentrates the signal on the product surface directly below the antenna, minimizing interference from surrounding structures. This is especially important in tall silos with internal beams and ladders, and in installations where the gauge must be mounted through a narrow nozzle, where wide-beam instruments suffer severe false-echo problems.

Q4: What power supply and output options are available?

The QWRD80G608 is available with two power configurations. The two-wire version operates on DC 24±6 V, with power and the 4-20 mA signal carried on the same two wires, which is the standard loop-powered arrangement in most process plants. The four-wire version operates on AC 220 V with separate signal wiring, convenient where AC power is available at the installation point. The output is 4-20 mA with HART digital communication, providing both the analog signal for direct connection to PLC and DCS inputs, and digital access to configuration parameters, diagnostics and process values through a HART communicator or host system.

Q5: What support and customization do you offer?

As the manufacturer, we provide direct engineering support including range selection, antenna and flange selection, installation guidance and troubleshooting. Customization options include measuring range, process connection from DN80, antenna type, power supply configuration, output protocol, labeling and packaging, plus OEM and ODM programs. With a monthly supply capacity of 100 pieces and delivery within 5-8 working days, we support both individual projects and multi-silo programs. Every unit is factory-calibrated and tested before shipment. Contact us with your vessel dimensions and application details for a recommendation and quotation.

Why Choose Our 26GHz Pulse Radar Level Gauge?

When your vessel is measured in tens of meters, you need radar with the range to reach the surface and the accuracy to make the reading count. The QWRD80G608 delivers proven pulse radar technology, ±1mm accuracy, a 30-120 meter range and a rugged stainless steel housing, with flexible power options and HART integration. As the manufacturer, you receive factory calibration, application-matched configuration and direct engineering support. When the tank is tall and the data is critical, choose the pulse radar that goes the distance.