Dual-Beam Radar Level Gauge with PTFE Barrel for Corrosive Chemical Service

Chemical tanks punish level instruments: corrosive vapors attack the antenna, aggressive liquids attack the wetted parts, and the tank atmosphere confuses the echo. The QWRD80G607 dual-beam radar level gauge meets this challenge with a PTFE barrel that resists chemical attack and a dual-beam design that keeps the measurement stable when conditions get difficult.

Why Do You Need a Dual-Beam Radar with PTFE Protection?

In chemical storage and processing, the level instrument must survive the very media it measures. Corrosive acids, alkalis and solvents attack unprotected antennas and housings, causing premature failure and risking product contamination. At the same time, chemical tanks often contain vapor, condensation and agitators that disturb the radar echo. A gauge with a PTFE barrel solves the corrosion problem: PTFE is chemically inert across an extremely wide range of media, so the antenna resists attack and the product is never contaminated by the instrument. The dual-beam design solves the measurement problem: by evaluating two radar beams, the gauge cross-checks the echo, delivering a stable and reliable level value even in turbulent or vapor-filled tanks. Together, these features give chemical plant operators a level instrument that lasts and measures accurately.

Working Principle: Dual-Beam Radar with Corrosion-Resistant Barrel

The QWRD80G607 transmits radar signals at high frequency toward the product surface and measures the reflected echoes to determine the level. The dual-beam design emits and evaluates two beams, allowing the signal processing to compare and cross-validate the echoes, which improves reliability in vessels with turbulence, internal structures or changing surface conditions. The antenna is enclosed in a PTFE barrel that provides outstanding corrosion resistance, allowing the gauge to be used with aggressive chemicals while maintaining non-contact measurement from the top of the vessel. The gauge achieves ±2-10mm accuracy, is protected to IP67, and offers 4-20 mA, HART, Profibus and Modbus outputs, with flange, thread or tri-clamp connections and RS485 digital communication.

Structural Advantages of the QWRD80G607

• Dual-beam technology: cross-validated echoes for stable, reliable readings.
• PTFE barrel: outstanding corrosion resistance for chemical service.
• Non-contact top-mounted design: no product contact, no contamination.
• Multiple protocols: 4-20 mA, HART, Profibus and Modbus outputs.
• ±2-10mm accuracy: dependable values for inventory and control.
• IP67 protection: dust-tight and water-resistant housing.
• Flange, thread and tri-clamp connections: flexible mounting.
• RS485 digital communication: networked tank monitoring.

Pain Point Analysis: 2 Challenging Working Conditions

Application Cases

Product Advantages

• Dual-beam echo cross-validation for reliability
• PTFE barrel for outstanding corrosion resistance
• Non-contact measurement, no product contamination
• 4-20 mA, HART, Profibus and Modbus outputs
• ±2-10mm measurement accuracy
• IP67 dust-tight and water-resistant protection
• Flange, thread and tri-clamp connections
• RS485 digital communication for networking

Technical Parameters

SEO FAQ

Q1: What is dual-beam radar technology?

Dual-beam radar technology uses two radar beams instead of one to measure the level. The gauge transmits and evaluates two beams toward the product surface, and its signal processing compares and cross-validates the echoes from both beams. This provides two independent measurements that must agree, which improves reliability in difficult conditions: if one beam is disturbed by turbulence, foam or an internal structure, the other beam still provides a valid echo, and the processing can identify and reject the disturbed signal. The result is a more stable and dependable level reading in agitated vessels, tanks with internal obstructions and changing surface conditions, where single-beam radars can produce erratic values.

Q2: Why is the PTFE barrel important for chemical applications?

The PTFE barrel protects the radar antenna from the corrosive atmosphere inside chemical tanks. PTFE (polytetrafluoroethylene) is chemically inert and resistant to attack by virtually all acids, alkalis and solvents across a wide temperature range, making it one of the most corrosion-resistant materials available. In chemical service, the vapor space above the liquid is often highly corrosive, and unprotected metal antennas corrode, degrade and eventually fail, while also risking contamination of the product. The PTFE barrel prevents this, giving the gauge a long service life in aggressive media and keeping the product pure. This makes the QWRD80G607 suitable for acid storage, solvent tanks and other corrosive chemical applications.

Q3: What communication protocols are supported?

The QWRD80G607 supports 4-20 mA analog output, HART digital communication, Profibus and Modbus fieldbus protocols, and RS485 serial communication. The 4-20 mA/HART combination serves conventional analog loops while providing digital configuration and diagnostics over the same wires. Profibus and Modbus allow the gauge to connect directly to industrial fieldbus networks used in many process plants, simplifying wiring and enabling digital data exchange with DCS and PLC systems. RS485 provides a simple serial interface for direct connection to controllers, converters and computers. This wide protocol support makes the gauge easy to integrate into virtually any control architecture.

Q4: What is the accuracy of the gauge?

The QWRD80G607 provides an accuracy of ±2-10mm, depending on the measuring range and application conditions. The accuracy is supported by the dual-beam design, which cross-validates echoes and reduces the effect of disturbances, and by the high-frequency radar signal, which gives a well-defined reflection from the product surface. In practical terms, this level of accuracy is suitable for chemical inventory management, process level control and safety monitoring. For applications with very tight accuracy requirements, the gauge can be configured and calibrated for your specific installation during commissioning to achieve the best possible performance.

Q5: What support and customization do you offer?

As the manufacturer, we provide direct engineering support including media compatibility advice, connection selection, protocol configuration and installation guidance. Customization options include measuring range, process connection (flange, thread or tri-clamp), output protocol, power supply, labeling and packaging, plus OEM and ODM programs for chemical plant integrators and distributors. With a monthly supply capacity of 100 pieces and delivery within 5-8 working days, we support both individual tanks and complete chemical plant projects. Contact us with your media, tank configuration and control system details for a tailored recommendation and quotation.

Why Choose Our Dual-Beam PTFE Radar Level Gauge?

Chemical service demands an instrument that resists the media it measures and stays reliable when conditions are difficult. The QWRD80G607 delivers both: a PTFE barrel that shrugs off corrosive chemicals and vapors, and dual-beam technology that cross-validates echoes for stable readings in turbulent tanks. With multiple protocols, ±2-10mm accuracy, IP67 protection and flexible connections, it is the professional choice for chemical and industrial level measurement. As the manufacturer, you receive application-matched configuration and direct engineering support. When your chemicals are aggressive and your levels must be reliable, choose the dual-beam radar built for the job.