Drexelbrook DR3500 Series FMCW Radar Level Transmitter

Overview

The Drexelbrook DR3500 Series is an 80 GHz Frequency-Modulated Continuous Wave (FMCW) radar level transmitter engineered for high-precision, non-contact level measurement in hygienic and demanding industrial process environments. Unlike pulse radar technology, FMCW radar continuously transmits a frequency-swept signal and calculates distance by analyzing the frequency difference between emitted and reflected waves—enabling superior signal-to-noise ratio, exceptional resolution, and immunity to vapor, foam, condensation, and turbulence. Designed specifically for applications requiring strict adherence to sanitary standards—including food & beverage processing, biopharmaceutical manufacturing, and fine chemical synthesis—the DR3500 delivers stable, repeatable measurements even in vessels with agitated surfaces, internal obstructions, or rapidly changing fill levels.

Key Features

• 80 GHz operating frequency ensures narrow beam divergence (as low as 4°), minimizing interference from tank walls, nozzles, or internal structures—ideal for small-diameter vessels and installations with limited mounting space.
• Planar convex lens antenna provides focused energy projection and eliminates dead zones near the antenna face; its smooth, crevice-free geometry supports CIP/SIP protocols and meets EHEDG and 3-A Sanitary Standards.
• 2-wire loop-powered design with integrated HART 7 protocol enables seamless integration into existing DCS, PLC, and asset management systems while supporting remote configuration, diagnostics, and firmware updates over the 4–20 mA analog channel.
• Robust process compatibility: rated for pressures from vacuum (–0.1 MPa) up to 4 MPa and temperatures spanning –40 °C to +150 °C, with optional high-temp antenna seals and extended temperature electronics housings.
• Advanced echo processing algorithms suppress false echoes from weld seams, ladders, or spray balls—critical for accurate level detection in stainless-steel tanks common in GMP-regulated facilities.

Sample Compatibility & Compliance

The DR3500 is certified for use in hygienic process lines handling liquids, slurries, and viscous media—including dairy products, fermentation broths, APIs, and sterile buffers. Its surface finish (Ra ≤ 0.8 µm), absence of gasket grooves or stagnant zones, and compatibility with aggressive cleaning agents (e.g., caustic soda, nitric acid, steam at 135 °C) ensure full alignment with FDA 21 CFR Part 11 data integrity requirements when paired with compliant host systems. Device documentation conforms to IEC 61508 (SIL2 capable), ATEX/IECEx Zone 0/1 (for applicable models), and CE marking under the EU Electromagnetic Compatibility and Low Voltage Directives. Optional third-party validation packages support IQ/OQ documentation per GAMP 5 guidelines.

Software & Data Management

Configuration and commissioning are performed via Drexelbrook’s PC-based SmartConfig software or handheld communicator (HART-compatible). The device supports full diagnostic logging—including signal strength history, echo curve snapshots, and temperature-compensated drift analysis—with timestamped records exportable in CSV format. When integrated into enterprise-level MES or LIMS platforms, audit trails comply with 21 CFR Part 11 requirements through role-based access control, electronic signatures, and immutable change logs. Firmware updates are verified via SHA-256 checksums and executed without process interruption.

Applications

• Continuous level monitoring of fermenters, bioreactors, and buffer storage tanks in cGMP biomanufacturing suites.
• Accurate inventory tracking in bulk ingredient silos and syrup holding tanks within high-speed beverage bottling lines.
• Interface level detection in dual-phase separation vessels (e.g., oil/water) where emulsion layers require sub-millimeter resolution.
• Level control in high-purity water (PW) and WFI distribution loops, including recirculation tanks subject to thermal cycling and pressure fluctuations.
• Monitoring of viscous, coating-grade materials in pharmaceutical coating drums where mechanical contact sensors risk contamination or wear.

FAQ

Is the DR3500 suitable for measuring level in pressurized stainless-steel reactors used in API synthesis?

Yes—its 4 MPa pressure rating, 316L wetted parts, and PTFE-sealed antenna assembly meet ASME BPE 2022 requirements for single-use and reusable bioprocessing equipment.
Can it detect rapid level changes during batch discharge or filling cycles?

Yes—the FMCW architecture achieves update rates up to 10 Hz, enabling real-time tracking of dynamic level transitions without signal dropout or averaging artifacts.
Does it support SIL2 functional safety certification for use in safety instrumented systems (SIS)?

Yes—certified per IEC 61508 Ed. 2, with documented safe failure fraction (SFF) > 90% and hardware fault tolerance (HFT) = 1 for level monitoring applications.
How is calibration traceability maintained for regulatory audits?

Factory calibration is traceable to NIST standards; on-site verification can be performed using certified reference targets or geometric tank strapping data—both methods supported by SmartConfig’s calibration report generator.