Milesight EM500-UDL Ultrasonic Distance/Level Sensor

The Milesight EM500-UDL is a rugged LoRaWAN ultrasonic distance and level sensor designed to monitor object distance and liquid levels in harsh environments in real time – without any physical contact. Built for water tank monitoring, liquid level detection, and industrial distance measurement, it delivers reliable long-range data transmission up to 10 km line of sight using the LoRaWAN protocol – ideal for agricultural, industrial, and utility deployments across Africa.

Unlike solar or rechargeable variants, the EM500-UDL is powered by a built-in 19,000 mAh replaceable Li-SOCl₂ battery – delivering up to 10 years of operation without replacement. A true set-and-forget solution, built for long-term outdoor deployment in the most demanding environments.

A single sensor. One critical measurement:

The EM500-UDL measures distance and level using non-contact ultrasonic technology from a single pole or wall-mounted unit – giving engineers, facility managers, and field operators a complete picture of level and distance conditions without multiple devices, complex wiring, or direct liquid contact.

Available in four variants to suit your application:

• W050 – Water/liquid detection, 0.3–5m range | Accuracy: ±1% FS – ideal for small to medium tanks and reservoirs
• W100 – Water/liquid detection, 0.5–10m range | Accuracy: ±1% FS – suited for larger tanks, open channels, and water resource monitoring
• C050 – Solid/object distance detection, 0.25–5m range | Accuracy: ±(1+0.3%×S) cm – ideal for object proximity, bin level, and stockpile monitoring
• C100 – Solid/object distance detection, 0.25–10m range | Accuracy: ±(1+0.3%×S) cm – suited for longer-range object and material level detection

All variants share 1mm resolution and IP67 protection.

Key Features:

• Non-contact ultrasonic distance and level detection – no liquid or object contact required
• Four variants covering 5m and 10m ranges for both water and solid targets
• Ultra-long battery life – up to 10 years on a single 19,000 mAh replaceable battery
• Long-range LoRaWAN communication up to 10 km line of sight
• IP67 waterproof enclosure for harsh outdoor environments
• NFC-enabled for easy field configuration via mobile app
• Stores up to 1,000 data entries locally with retransmission support
• Supports threshold alarms, change alarms, and Milesight D2D direct device control
• Compatible with standard LoRaWAN gateways and network servers
• Multi-region frequency support: EU868, US915, AU915, AS923 and more

The EM500-UDL provides real-time distance and level intelligence that helps prevent overflows, optimise storage capacity, and improve operational efficiency across any tank, bin, or open channel deployment.

Smart level monitoring starts with accurate data – measure what matters most with the Milesight EM500-UDL.

Need a gateway too? Pair it with the Milesight UG67 Outdoor LoRaWAN Gateway for a complete long-range level monitoring solution across your entire site or farm.

Check out the Milesight EM500-UDL Ultrasonic Distance & Level Sensor User Online Manual.