EM400-UDL Ultrasonic

EM400-UDL Ultrasonic
Distance Sensor
Professional, Reliable and Durable
  • Non-Contact Distance Measurement
  • Great Flexibility with Multiple Versions
  • Value-added Temperature and Tilt Monitoring
  • Various Professional Applications
  • Long-Lasting 10 Years Battery Life
  • Rugged and Reliable IP67 Rated Enclosure

EM400-UDL, as the versatile product among EM400 series, offering three versions - Standard, Pro, and Snow Level with varying detection range, resolution, and accuracy, is designed to cater to the demands of professional applications. Equipped with prolonged battery life and robust IP67 rated enclosure, EM400-UDL is the perfect fit for professional and demanding applications.

Discover New Possibilities with EM400 Series

Non-Contact Distance Measurement

Leveraging ultrasonic distance detection, EM400-UDL ensures a stable and reliable performance while detecting different solid or liquid mediums. Featuring non-contact distance measurement, the probe of EM400-UDL will remain unaffected or contaminated by the medium detected, and deliver highly accurate measurement.

Great Flexibility with
Multiple Versions

EM400-UDL comes in three versions Standard, Pro and Snow Level versions with different probes optional. With 5 probes at choice, EM400-UDL provides great flexibility to satisfy various demands for professional applications.


Value-added Temperature and Tilt Monitoring

Device Tilt Status Monitoring
The EM400-UDL is equipped with a built-in 3-axis accelerometer which can be used to monitor the device tilt status and alert the users whether the device is well positioned.


Temperature Monitoring

With built-in NTC thermistor, EM400-UDL can monitor the temperature and send alert in time if the temperature changes sharply which may indicate combustion.


Various Professional Applications

EM400-UDL is an excellent choice for a wide range of applications. Whether for industrial settings or in cities, EM400-UDL is dependable to provide accurate and reliable data to optimize operations and improve efficiency.

  • Boiler Expansion Monitoring
  • Tank Fill Level Monitoring
  • Barn Fill Level Monitoring
  • Flood Monitoring
  • Sewer Water Level Monitoring

Rugged and Reliable IP67
Rated Enclosure

IP67 rated enclosure ensures EM400-UDL is protected against dust, water, and other environmental hazards, enabling it to withstand harsh environment.

EM400-UDL also features a conformal coating on its PCBA, which provides an extra layer of protection against moisture, dust, and other contaminants that can damage electronic components.

These two features extend the lifespan of the EM400-UDL and ensure that it continues to function reliably in harsh conditions.

Ultra-long 10 Years
Battery Life

EM400-UDL is equipped with high-capacity batteries that can work for over 10 years, offering a long-lasting and reliable performance. Easily replaceable batteries making the installation and maintenance a breeze. This also helps to reduce wiring costs, ensuring that customers can easily install the device and get started with monitoring their garbage bins.


LoRaWAN® Based

  • Penetrating Signals:
    data transmission range up to 2 km in urban areas and 15 km in rural areas
  • High Compatibility:
    compliant with standard LoRaWAN® gateways and network servers


Cloud Data Management
Milesight IoT Cloud

  • Data Visualization Dashboard:
    All figures in a glance

  • Automatic Triggers:
    Interactive collaboration with Milesight IoT sensors to realize scene-based automation

  • Regular Reports & Real-Time Alerts:
    Data-based insights

  • Android & iOS App:
    Manage devices at your fingertips


NFC Configuration

1st Step
Install the Milesight ToolBox


2nd Step
Enable NFC and run Toolbox,
Attach your phone to the device

3rd Step
Verify the password and start configuring.

Easy and Sturdy Installation

Model Standard Version Pro Version Snow Version
Measurement Distance Range C050: 25 ~ 500 cm
C100: 25 ~ 1000 cm
W050: 30 ~ 500 cm
W100: 50 ~ 1000 cm
S050: 50 ~ 500 cm
Accuracy ± (1+0.3%*S) cm1, S=distance ±1% FS ±1% FS
Resolution 1 mm
Device Position Status Normal/Tilt
Temperature Range -40 ~ 125°C
Resolution 0.1°C
Wireless Transmission Technology LoRaWAN®
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
Operation 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 Life2 > 10 years
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

1. This accuracy is applicable to the measuring range of 25~800cm.
2. Tested under laboratory conditions and for guideline purposes only.


EM400-UDL Datasheet
M400-UDL User guide