The Dragino LDDS20 is a LoRaWAN ultrasonic liquid level sensor that uses non contact method to measure the height of liquid in a metal or glass container. The measured values are uploaded wirelessly to the LoRaWAN IoT Server.
The LDDS20 sensor is installed directly below the container to detect the height of the liquid level. The sensor can be mounted on the outside of the container with glue (not included). It can measure liquid levels up to 2m.
LDDS20 is powered by 8500mAh Li-SOCI2 battery. It is designed for long term use up to 10 years.
Each LDDS20 is pre-loaded with a set of unique keys for LoRaWAN registrations. If you register these OTAA keys to the local LoRaWAN server (e.g. TTN), then it will auto connect after power on.
More information is available in the datasheet and on the website of Dragino.