The Milesight EM400-UDL W050 is a non-contact ultrasonic sensor for liquid level in water tanks, sumps and slow-moving water. It mounts above the surface and measures the distance down, so the probe never touches the liquid. This is the Pro version, covering 30 to 500 cm.
Why pick it
- Accuracy of ±1% of full scale, with 1 mm resolution.
- Two replaceable 9000 mAh batteries: Milesight quotes over 10 years on LoRaWAN at a 10-minute interval.
- Built-in accelerometer flags if the unit is knocked or tilted, and a temperature sensor raises an alarm on sharp rises.
Available as a LoRaWAN version or an NB-IoT/Cat-M version with a SIM slot and GNSS, for sites with no gateway. Set up from a phone over NFC. IP67, flat-surface screw mounting.
Works with any standard LoRaWAN gateway and network server, such as the Milesight UG65 indoors or the UG67 outdoors, with alerts and dashboards on IoT Factory.
Other ranges: the EM400-UDL also comes as C100 (25–1000 cm), W050 (30–500 cm) and W100 (50–1000 cm). For a wider industrial choice see the EM500-UDL, and for radar accuracy the EM410-RDL.
