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Milesight EM400-UDL ultrasonic level sensor for tank fill and flood monitoring
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Milesight EM400-UDL ultrasonic level sensor for tank fill and flood monitoring

EM400-UDL

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Ultrasonic Distance Sensor

Non-contact ultrasonic level and distance sensor with LoRaWAN and NB-IoT/Cat.M options.

Features

  • Selective probes from 25 cm to 10 m range
  • Standard and Pro versions with varying accuracy
  • Built-in tilt and temperature monitoring
  • LoRaWAN and NB-IoT/Cat.M with GNSS (cellular)
  • IP67 rugged enclosure with conformal PCBA coating
  • Two 9000 mAh batteries, up to 10 years
  • NFC configuration

Hardware

  • 2 × 9000 mAh ER26500 Li-SOCl2 batteries
  • 118 × 65 × 80 mm, ABS + PC
  • Probe options: C050, C100, W050, W100, S050
  • Screw mounting on flat surfaces

Applications

Tank fill level, flood monitoring, sewer water level, barn storage and boiler expansion monitoring.

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    Description

    EM400-UDL Description

    Overview

    The EM400-UDL is a non-contact ultrasonic distance sensor for liquid level and distance measurement. Standard and Pro versions with five probe options cover ranges from 25 cm to 10 m for professional indoor and outdoor applications.

    Non-Contact Ultrasonic Measurement

    Ultrasonic sensing keeps the probe unaffected by the medium, delivering accurate level data for static or slow-flowing water bodies, tanks and industrial vessels.

    Flexible Probe Options

    C050/C100 compact probes suit short-range tanks; W050/W100 wide-beam probes cover longer industrial ranges; S050 supports specialized layouts. Resolution is 1 mm across variants.

    Value-Added Monitoring

    A 3-axis accelerometer reports device tilt status while an NTC thermistor monitors temperature, alerting to sharp changes that may indicate combustion or misalignment.

    Dual Connectivity

    LoRaWAN integrates with Milesight gateways and IoT Cloud. NB-IoT/Cat.M adds cellular backhaul, cumulative reporting and GNSS asset tracking.

    Built for Harsh Sites

    IP67 sealing, conformal PCBA coating and two high-capacity batteries support up to 10 years of maintenance-free operation outdoors.

    Industry Applications

    EM400-UDL Industrial Applications

    Tank & Vessel Level

    Water, chemical and storage tanks are monitored for fill level without contact with the medium, reducing contamination and maintenance.

    Flood & Sewer Monitoring

    Outdoor installations track river, sewer and impoundment levels with long battery life and IP67 protection.

    Agriculture & Barn Storage

    Grain, feed and liquid storage silos benefit from non-contact level data over LoRaWAN backhaul.

    Industrial Infrastructure

    Boiler expansion, cooling reservoirs and process vessels use tilt and temperature alarms alongside distance readings.

    Specifications

    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 (915 MHz) / 19 dBm (470 MHz)
    Sensitivity −137 dBm @300 bps
    Mode OTAA/ABP Class A

    NB-IoT/Cat.M Version

    Cellular Band Cat M1 and Cat NB2 multi-band
    SIM Slot 1 × Micro SIM (3FF)
    Application Mode TCP/UDP/MQTT/AWS
    GNSS Longitude/latitude, 0.000001 resolution

    Measurement

    Standard Range C050: 25 ~ 500 cm; C100: 25 ~ 1000 cm
    Pro Range W050: 30 ~ 500 cm; W100: 50 ~ 1000 cm
    Accuracy Standard: ±(1+0.3%×S) cm; Pro: ±1% FS
    Resolution 1 mm
    Device Position Normal/tilt (3-axis accelerometer)
    Temperature −40 ~ 125 °C, 0.1 °C resolution

    Physical Characteristics

    Power Supply 2 × 9000 mAh ER26500 Li-SOCl2 batteries
    Battery Life LoRaWAN >10 years; NB TCP/UDP ~10 years, MQTT/AWS ~5 years
    Operating Temperature −30 °C ~ 70 °C
    Ingress Protection IP67
    Dimensions 118 × 65 × 80 mm
    Order Codes

    Order Codes

    SKU: EM400-UDL

    EM400-UDL-915M – LoRaWAN ultrasonic distance sensor, US915

    EM400-UDL-N03GL – NB-IoT/Cat.M variant with cellular connectivity

    Specify LoRaWAN frequency band (EU868, US915, AS923, etc.) when ordering.

    Order by referencing the SKU – contact info@easynt.com

    Downloads

    Downloads and Datasheets

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