Milesight EM400-UDL LoRaWAN® Ultrasonic Distance Sensor (EU868)

Milesight EM400-UDL LoRaWAN® Ultrasonic Distance Sensor (EU868)

• LoRaWAN® and NB-loT Versions for Broader Applications
• Non-Contact Distance Measurement
• Value-added Temperature and Tilt Monitoring
• LoRaWAN & NB-IoT & CAT M Versions Available
• Long-Lasting Battery Life of up to 10 Years
• Rugged and Reliable IP67 Rated Enclosure
• Positioning Function Enabled by GNSS Modules (NB-loT Version)

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Product Description

The Milesight EM400-UDL Ultrasonic Distance/Level Sensor is an advanced and versatile solution designed for professional applications. It comes in Standard and Pro versions, each offering different detection ranges, resolutions, and accuracies. This sensor is ideal for a variety of industrial and urban applications, including boiler expansion monitoring, tank fill level monitoring, and flood monitoring.

Key Features

  • LoRaWAN, NB-IoT & CAT M Versions: Available in multiple versions for broad application scenarios.
  • Non-Contact Distance Measurement: Uses ultrasonic technology for accurate measurements without contamination.
  • Temperature and Tilt Monitoring: Equipped with a built-in NTC thermistor and a 3-axis accelerometer for additional monitoring capabilities.
  • IP67 Rated Enclosure: Ensures robust protection against environmental factors.
  • Long Battery Life: Up to 10 years, depending on the version and usage.
  • Flexible Probing Options: Offers multiple probes to cater to different professional needs.
  • Wireless Transmission: Supports LoRaWAN® for wide area coverage and low power consumption.
  • Cloud Data Management: Integrates with the Milesight IoT Cloud for efficient data visualization and management.
  • NFC Configuration: Allows for easy configuration and management of the device.

The EM400-UDL is a reliable and durable choice for various professional applications, ensuring accurate and efficient monitoring of distance and level measurements​.

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Model Standard Version Pro Version
Range C050: 25 ~ 500 cm
C100: 25 ~ 1000 cm
W050: 30 ~ 500 cm
W100: 50 ~ 1000 cm
Accuracy ± (1+0.3%*S) cm, S=distance
(- 15°C ~ 60°C)
±1% FS
(- 30°C ~ 65°C)
Resolution 1 mm
Device Position
Status Normal/Tilt
Range -40 ~ 125°C
Resolution 0.1°C
GNSS Positioning (NB-IoT/Cat M Version Only)
Parameters Longitude/Latitude
Resolution 0.000001
Wireless Transmission
LoRaWAN® Version
Frequency CN470/IN865/RU864/EU868/US915/AU915/KR920/AS923-1&2&3&4
Tx Power 16 dBm (868 MHz)/20 dBm (915MHz)/19 dBm (470MHz)
Sensitivity -137dBm @300bps
Mode OTAA/ABP Class A
NB-IoT/Cat M Version
Cellular Band Cat M1: B1/B2/B3/B4/B5/B8/B12/B13/B18/B19/B20/B25/B26/B27/B28/B66/B85
Cat NB2: B1/B2/B3/B4/B5/B8/ B12/B13/B18/B19/B20/B25/B28/B66/B71/B85
SIM Slot 1 (Micro SIM-3FF)
Application Mode TCP/UDP/MQTT/AWS/Milesight IoT Cloud2
Power On & Off NFC, Power Button (Internal)
Configuration Mobile App (via NFC)
Physical Characteristics
Power Supply 2 x 9000 mAh ER26500 Li-SOCL2 Batteries
Battery Life LoRaWAN® Version: > 10 years (10-min Interval, 25°C)
NB-IoT/Cat M Version: TCP/UDP—Around 10 Years, MQTT/AWS—Around 5 Years (4 Times Report per Day, per Report Includes 12 Packages with 30-min Collection Interval, 25°C)4
Operating Temperature - 30°C ~ 70°C
Relative Humidity ≤95% (non-condensing)
Ingress Protection IP67
Dimension 118 × 65 × 80 mm
Material ABS + PC (Flame Retardant)
Color Black gray (C050/C100), Gray (W050/W100/S050)
Installation On the Flat Surfaces with Screws

Shipping Policy

We provide worldwide shipping using reliable tracked
shipping services.

Local Shipments within Cyprus

Shipments in Cyprus are performed usually with ACS Courrier
or AKIS Express. In some cases, we might deliver the products ourselves. A pick-up
option from our locations is also available.

International Shipments

International shipments are performed using Express Airway
Shipping Services. We are currently shipping orders with TNT Express and FedEX.
As soon as your shipment is dispatched you will receive the shipment confirmation
including the shipment tracking number which you can use to track your order
from the shipment provider website.

We dispatch orders within 1-3 workdays after the day of the
order placement. 

General Return Policy

We have a 30-day return policy, which means you have 30 days
after receiving your item to request a return.

To be eligible for a return, your item must be in the same
condition that you received it, unworn or unused, with tags, and in its
original packaging. You’ll also need the receipt or proof of purchase.

To start a return, you can contact us at If
your return is accepted, we’ll send you a return shipping label, as well as
instructions on how and where to send your package. Items sent back to us
without first requesting a return will not be accepted.

For any further information, help and support regarding the
shipping and/or return process you can contact us at:

  • Email:
  • Telephone: +357 22 282828