Ultrasonic distance sensor EM400-MUD

NB-IoTLoRaWAN4G

Overview
EM400‑MUD is a versatile distance and level measurement sensor in the EM400 series, engineered for applications such as smart parking, smart waste management and general distance/level monitoring. It offers three pre‑set operation modes, long replaceable battery life, robust environmental protection and connectivity options including LoRaWAN®, NB‑IoT and Cat M1 (GNSS available on NB‑IoT/Cat M variants).

Key features

• Three pre‑set modes for fast deployment: Standard Mode, Parking Lot Mode (LoRaWAN® version only), and Bin Mode.
• Ultrasonic distance detection with minimal blind spot and a 60° beam angle for accurate distance/level measurement.
• 3‑in‑1 sensing: ultrasonic distance sensor, built‑in 3‑axis accelerometer and built‑in NTC thermistor (for lid status and burn detection).
• Replaceable battery solution with multi‑year autonomy (up to 10 years in typical reporting modes).
• Rugged IP67 enclosure and conformal coating on the PCBA for moisture and dust protection in outdoor/harsh environments.
• On‑site NFC configuration and power on/off via mobile app for fast commissioning.
• Multiple connectivity versions available: LoRaWAN®, NB‑IoT and Cat M1 (GNSS positioning available in NB‑IoT/Cat M versions).

Applications

• Smart parking: vehicle detection and parking space occupancy reporting (Parking Mode on LoRaWAN® version).
• Smart waste / bin monitoring: fill level measurement, lid status and combustion detection for municipal and commercial bins.
• General distance/level measurement: liquid level, tank monitoring and other distance monitoring scenarios.

Operational & management features

• Pre‑set modes with configurable data collection and reporting intervals to optimize power consumption per use case.
• Cumulative reporting (NB/Cellular versions) to aggregate multiple data packets into single reports, reducing transmission cost and battery drain.
• Cloud‑compatible for visualization, automated triggers, scheduled reports and real‑time alerts (compatible with Milesight IoT Cloud).
• On‑site NFC configuration via mobile ToolBox app: enable/disable, calibration, thresholds, tilt & distance switches.

Specifications (table)
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 bands: 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), 1.8V
Application mode: TCP / UDP / MQTT / AWS

Measurement
Distance detection range: 3 ~ 450 cm
Detection accuracy: ±(1 + 0.3% * S) cm (S = distance) over -15°C ~ 60°C
Resolution: 1 mm
Beam angle: 60°
Device position: Status = Normal / Tilt

Temperature
Range: -40 ~ 125°C
Resolution: 0.1°C

GNSS positioning (NB‑IoT / Cat M versions only)
Parameters: Longitude / Latitude
Resolution: 0.000001

Others
LED: 1 × internal LED indicator
Button: 1 × internal Power/Reset button
Software / configuration: Power on/off via NFC or internal button; configuration via mobile app (NFC) and downlink; features include cumulative report (NB), calibration, threshold alarm, tilt & distance switch

Physical characteristics
Power supply: 2 × 9000 mAh ER26500 Li‑SOCl2 batteries
Battery life (typical conditions): LoRaWAN® Version — Standard mode: >10 years (10‑min interval, 25°C); Bin mode: >10 years (20‑min interval, 25°C); Parking lot mode: ~5 years (12 triggers/day, 25°C). NB/Cat M Version — TCP/UDP ≈ 10 years; MQTT/AWS ≈ 5 years (4 reports/day, each report may include up to 12 packets from 30‑min collection, 25°C).
Operating temperature: -30°C ~ 70°C
Relative humidity: ≤95% (non‑condensing)
Ingress protection: IP67
Dimension: 118 × 65 × 32.5 mm
Housing & color: ABS + PC (UL94 V0), black gray
Weight: 181.4 g (batteries included)
Installation: Screw mounting on flat surfaces

Characteristics / technical specifications

• Model: EM400‑MUD
• Connectivity: LoRaWAN®, NB‑IoT, Cat M1 (GNSS for NB/Cat M)
• Distance range: 3–450 cm; accuracy ±(1 + 0.3% * S) cm; resolution 1 mm; beam angle 60°
• Onboard sensors: Ultrasonic sensor, 3‑axis accelerometer, NTC thermistor
• Power: 2 × ER26500 (9000 mAh) replaceable batteries; typical multi‑year battery life depending on mode
• Enclosure: IP67, conformal coating on PCBA for harsh environments
• Configuration: NFC mobile app + downlink; supports calibration, thresholds, tilt/distance alarms
• Typical applications: Smart parking, smart waste management, distance/level measurement, tank monitoring