Ultrasonic distance sensor EM400-UDL

NB-IoTLoRaWANwireless

Overview

EM400-UDL is an ultrasonic distance and level sensor (EM400 series) for professional field applications. It provides non-contact distance/level measurement with millimeter resolution and is offered in LoRaWAN® and NB‑IoT/Cat M cellular variants, plus Standard and Pro families with selectable probes to match different ranges and accuracies.

Key Selling Points

• Available in LoRaWAN®, NB‑IoT and Cat M versions to suit varied deployment scenarios
• Standard and Pro variants with multiple probe options for different detection ranges and accuracies
• Non-contact ultrasonic sensing for contamination-free liquid/level/distance measurement
• Built-in temperature sensor (NTC) and 3‑axis accelerometer for tilt/position monitoring
• IP67 enclosure and conformal-coated PCBA for harsh environments
• Ultra-long battery operation with two user-replaceable ER26500 cells

Wireless Versions / Connectivity

• LoRaWAN® version: multi-region frequency support (CN470 / IN865 / RU864 / EU868 / US915 / AU915 / KR920 / AS923 variants). OTAA / ABP Class A operation; very low power consumption and long range.
• NB‑IoT / Cat M version: supports Cat M1 and Cat NB2 bands; application modes include TCP / UDP / MQTT / AWS. GNSS available in cellular versions for position reporting (latitude/longitude).

Non-Contact Distance Measurement

EM400-UDL uses an ultrasonic probe for non-contact measurement so the sensor is not in direct contact with the measured medium. Both Standard and Pro families deliver millimeter resolution with accuracy tuned by the chosen probe.

Multiple Versions & Probes

Offered in Standard and Pro variants with probe options (examples: C050 / C100 for Standard; W050 / W100 for Pro) to cover ranges from short to extended distances depending on application needs.

Value-added Temperature & Tilt Monitoring

• Tilt monitoring: integrated 3‑axis accelerometer reports device orientation and can trigger alerts when installation angle changes.
• Temperature monitoring: internal NTC thermistor for ambient/device temperature measurement and alerting on significant changes.

Durability & Environmental Protection

IP67-rated housing (ABS + PC UL94 V0) and conformal coating on the PCBA provide dust/water resistance and improved tolerance to moisture and contaminants for outdoor and industrial deployments.

Applications

• Tank and tank-fill level monitoring
• Boiler expansion and industrial distance measurement
• Flood and river water level monitoring
• Remote liquid monitoring in industrial and municipal systems

Device Management & Configuration

• NFC configuration and mobile ToolBox app for commissioning and parameter changes without opening the enclosure.
• Compatible with cloud platforms (Milesight IoT Cloud) for visualization, triggers, scheduling and alerts.

Battery & Maintenance

• Powered by 2 × user-replaceable ER26500 Li‑SOCL2 batteries (2 × 9000 mAh).
• Designed for long field lifetime: LoRaWAN® version > 10 years under specified test conditions; NB‑IoT/Cat M: TCP/UDP ≈ 10 years, MQTT/AWS ≈ 5 years (example reporting patterns).

Technical Specifications

• Brand: Milesight
• Model: EM400-UDL (Standard / Pro; probe examples: C050, C100, W050, W100)
• Measurement: Ultrasonic distance/level, non-contact
• Distance ranges (examples): C050 25–500 cm; C100 25–1000 cm; W050 30–500 cm; W100 50–1000 cm
• Accuracy: Standard example ±(1 + 0.3% * S) cm (S = distance) over −15 °C to 60 °C; Pro example ±1% FS over −30 °C to 65 °C
• Resolution: 1 mm
• Temperature sensor: −40 °C to 125 °C; resolution 0.1 °C (NTC)
• Tilt/position: 3‑axis accelerometer (Normal / Tilt reporting)
• GNSS: longitude/latitude (NB‑IoT / Cat M versions only)
• LED: 1 internal; Button: 1 internal power/reset
• Power: 2 × 9000 mAh ER26500 Li‑SOCL2 batteries
• Battery life (test guideline): LoRaWAN® > 10 years (10‑min interval, 25 °C); NB‑IoT/Cat M: TCP/UDP ≈ 10 years, MQTT/AWS ≈ 5 years (example patterns)
• Operating temperature: −30 °C to 70 °C
• Relative humidity: ≤ 95% (non‑condensing)
• Ingress protection: IP67
• Dimensions: 118 × 65 × 80 mm
• Housing: ABS + PC (UL94 V0)
• Color: Standard — black gray (C050/C100); Pro — gray (W050/W100)
• Weight: C050 & C100: 252.7 g (with batteries); W050 & W100: 246.6 g (with batteries)
• Installation: screw mounting on flat surfaces
• Certifications: CE, FCC; Environmental: RoHS
• Software/features: NFC configuration, cumulative reporting (NB), calibration, threshold alarms, tilt & distance-switch functions