The EM41x-RDL is a high-performance non-contact radar distance and liquid level sensor based on millimeter-wave radar technology. By operating at higher frequencies, it delivers stable, accurate measurements over long distances and remains largely unaffected by challenging environmental conditions such as temperature fluctuations, dust, vapor, condensate, or acoustic noise. Designed for harsh and demanding environments, the EM41x-RDL features an IP68 waterproof, fully sealed enclosure and a PVDF housing that provides exceptional resistance to corrosion, wear, and compression. The sensor requires no routine maintenance and supports ATEX Zone 0 compliance (EM411-RDL only), making it suitable for hazardous areas. The EM41x-RDL accurately measures the distance between the sensor and liquids of various types, including freshwater, wastewater, seawater, and high-concentration brine. It is ideal for applications such as sewers, rivers, reservoirs, storage tanks, and high-salt mist environments. Milesight offers both LoRaWAN® and Cellular versions to meet different connectivity requirements. The LoRaWAN version integrates seamlessly with Milesight LoRaWAN gateways and the Milesight Development Platform for remote, visualized data management, while the Cellular version supports multiple application modes for compatibility with diverse IoT platforms. Key Features 8° narrow radar beam angle focuses precisely on target fluid for high-accuracy level measurement Wide measuring range from 0.3 m to 12 m with a minimal blind zone Unaffected by dust, condensate, temperature changes, or acoustic noise Non-invasive liquid level monitoring, suitable for hazardous and non-hazardous liquids Optional internal or external antenna to suit different installation scenarios Built-in 3-axis accelerometer for device tilt detection and monitoring Radar echo curve visualization and one-click diagnostics for easy calibration in varying environments Blind zone alarm when measurements fall within the blind zone PVDF enclosure offering excellent corrosion resistance, wear resistance, and mechanical strength IP68 waterproof design, resistant to freshwater immersion up to 1 m for 48 hours ATEX Zone 0 support (EM411-RDL only): Ex ia IIC T4 Ga Threaded mounting design for easy tank installation without additional accessories Local data storage with retransmission to prevent data loss Easy configuration via NFC and Bluetooth Remote device management and OTA upgrades via Milesight Development Platform Technical Documents EM41x-RDL DataSheet EM41x-RDL (LoRaWAN) User Guide LoRa is a registered trademark of Semtech Corporation. LoRaWAN is a trademark of the LoRa Alliance. USB-C is a registered trademark of USB Implementers Forum. MCCI and MCCI Catena are registered trademarks of MCCI Corporation. All other trademarks are the property of their respective owners.
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