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Radar Distance and Level Sensor – 60 GHz, 12 m Range, IP68: EM41x-RDL | Milesight

Milesight EM41x-RDL non-contact radar level sensor with 60 GHz technology, 0.3–12 m range and IP68 enclosure. LoRaWAN and cellular versions for water, wastewater and tank monitoring. ATEX Zone 0 option available.

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The Milesight EM41x-RDL is a non-contact radar distance and level sensor designed for remote monitoring of liquids and smooth solid surfaces in demanding environmental and industrial applications. Using 60 GHz millimeter-wave radar technology, it measures distances from 0.3 to 12 metres with a resolution of 1 mm and measurement accuracy of up to ±2 mm under specified conditions.

The sensor provides reliable distance and level measurements in environments exposed to dust, condensation, temperature variations and acoustic noise. Its IP68-rated PVDF enclosure offers resistance to corrosion and wear, making it suitable for applications including wastewater infrastructure, rivers, reservoirs, storage tanks and high-salinity environments.

The EM41x-RDL series includes LoRaWAN and cellular communication versions to accommodate different remote monitoring requirements. The EM411-RDL also offers ATEX Zone 0 certification for applications requiring equipment approved for potentially explosive atmospheres.

What is the EM41x-RDL used for?

The EM41x-RDL Radar Distance and Level Sensor measures the distance between the sensor and the surface of a liquid or smooth solid material without physical contact.

In liquid level monitoring applications, the measured distance can be used to determine the liquid level relative to the installation reference. This measurement method avoids direct contact between the sensing equipment and the monitored liquid.

The sensor is designed for applications where environmental conditions can affect conventional measurement methods, including installations exposed to condensation, dust, temperature changes and corrosive conditions.

Advantages

Non-contact radar measurement: 60 GHz millimeter-wave technology measures distance without direct contact with the monitored material.
Extended measurement range: measures distances from 0.3 to 12 m with a small blind zone.
High measurement accuracy: up to ±2 mm under specified surface conditions, with 1 mm resolution.
Narrow radar beam: 8° detection angle focuses the measurement on the target surface.
Environmental resistance: measurements are less affected by dust, condensation, temperature variations and acoustic noise.
Corrosion-resistant housing: PVDF construction provides resistance to corrosion and wear.
Waterproof enclosure: IP68 protection, specified for immersion in fresh water at a depth of 1 m for up to 48 hours.
Hazardous area option: EM411-RDL is certified for ATEX Zone 0 applications, with Ex ia IIC T4 Ga marking.
Integrated tilt monitoring: built-in three-axis accelerometer monitors the sensor's installation position.
Measurement diagnostics: radar-echo curve visualization and diagnostic functions support measurement verification and distance calibration.
Configurable alarms: distance threshold, distance change and blind zone alarms.
Flexible communication: LoRaWAN and cellular versions are available for different monitoring infrastructures.
Local data storage: stores up to 2,000 records with retransmission functionality.
Flexible installation: supports wall bracket mounting and threaded tank installation.

Technical specifications

Radar Measurement
Product series	EM41x-RDL
Measurement technology	Millimeter-wave radar
Radar frequency	60 GHz
Detection range	0.3–12 m
Detection angle	8°
Measurement accuracy	Up to ±2 mm on perfectly smooth flat solid surfaces or still liquid surfaces; up to ±5 mm on relatively smooth flat surfaces or stable liquid surfaces
Resolution	1 mm
Measurement targets	Liquids and smooth solid surfaces
Device position monitoring	Normal / Tilt, using integrated three-axis accelerometer
Wireless Communication
Communication options	LoRaWAN or cellular, depending on model
LoRaWAN frequency bands	CN470 / IN865 / EU868 / RU864 / US915 / AU915 / KR920 / AS923-1, 2, 3, 4
LoRaWAN transmission power	16 dBm (868 MHz); 20 dBm (915 MHz); 19 dBm (470 MHz)
LoRaWAN sensitivity	-137 dBm @ 300 bps
LoRaWAN activation	OTAA / ABP, Class A
Cellular communication	LTE Cat 1 (EM410-RDL-L0CEU)
Cellular application protocols	TCP, UDP, MQTT, AWS, Milesight Development Platform
Cellular SIM interface	Nano SIM (4FF), 1.8 V / 3 V
Antenna options	Internal or external antenna, depending on hardware configuration
External antenna connector	50 Ω SMB male
Configuration and Data Management
Configuration	Mobile application via NFC or Bluetooth; downlink
Data storage	2,000 entries
Advanced functions	Distance threshold alarm, distance change alarm, blind zone alarm, radar-echo curve, diagnostics and data retransmission
Data retrieval	Supported on LoRaWAN versions
Platform management and OTA updates	Supported on EM410-RDL
Physical and Environmental Characteristics
Power supply	1 × 19000 mAh ER34615 Li-SOCl2 battery
Relative humidity	0–100% RH (non-condensing)
Ingress protection	IP68 (1 m fresh water immersion, up to 48 hours)
Housing material	PVDF (UL94 V0)
Dimensions	Ø101 × 87 mm
Weight	400 g
Tank thread options	G 1½-inch or NPT 1½-inch
Installation	Wall bracket or threaded tank installation
Environmental compliance	RoHS

EM41x-RDL Model Comparison

The EM41x-RDL series includes three models designed for different environmental conditions, communication requirements and installation constraints.

Parameter	EM411-RDL	EM410-RDL	EM410-RDL-L0CEU
Communication	LoRaWAN	LoRaWAN	LTE Cat 1
Measurement range	0.3–12 m	0.3–12 m	0.3–12 m
Operating temperature	-20°C to +60°C	-40°C to +70°C	-35°C to +70°C
ATEX Zone 0	Yes – Ex ia IIC T4 Ga	Not specified	Not specified
Regulatory approvals	CE, FCC, ATEX Zone 0	CE, FCC	CE
Ingress protection	IP68	IP68	IP68

Typical applications

Wastewater and sewer monitoring: non-contact liquid level measurement in sewer infrastructure and wastewater installations.
River level monitoring: measure changes in water surface distance for environmental monitoring applications.
Reservoir monitoring: monitor liquid levels in impounding reservoirs and water storage installations.
Industrial storage tanks: measure liquid levels without direct contact with the stored material.
Corrosive environments: monitor liquids in locations exposed to seawater, concentrated brine or high-salt mist.
Hazardous area monitoring: use the ATEX Zone 0-certified EM411-RDL where its certification and installation requirements are applicable.

What should you check before choosing the EM41x-RDL?

Before selecting an EM41x-RDL sensor, verify the required measurement distance, installation geometry, target surface conditions and environmental temperature range. The measurement range extends from 0.3 to 12 m, and the sensor uses an 8° radar beam.

The selection of the communication version is also important. The EM411-RDL and EM410-RDL use LoRaWAN communication, while the EM410-RDL-L0CEU uses cellular LTE Cat 1 connectivity.

For potentially explosive atmospheres, the EM411-RDL is the model identified with ATEX Zone 0 certification. The suitability of the equipment and its certification for a particular Canadian hazardous-location installation must be verified separately.

For Canadian deployments, confirm the required wireless frequency configuration, regulatory approvals and communication network compatibility before ordering.

Frequently asked questions

What is the measurement range of the EM41x-RDL?

The sensor measures distances from 0.3 to 12 m using 60 GHz millimeter-wave radar technology.

Can the EM41x-RDL measure liquid levels without contact?

Yes. The sensor measures the distance to the liquid surface without direct contact, making it suitable for applications involving water, wastewater and other compatible liquids.

Is the EM41x-RDL suitable for corrosive environments?

The sensor uses a PVDF enclosure designed for resistance to corrosion and wear. The manufacturer identifies seawater, concentrated brine and high-salt mist environments among its intended applications.

Which EM41x-RDL model supports ATEX Zone 0?

The EM411-RDL is the version identified with ATEX Zone 0 certification and Ex ia IIC T4 Ga marking.

What is the difference between the LoRaWAN and cellular versions?

The LoRaWAN versions communicate through compatible LoRaWAN infrastructure, while the cellular version uses LTE Cat 1 connectivity and supports protocols including TCP, UDP and MQTT.

Why choose the Milesight EM41x-RDL?

The Milesight EM41x-RDL Radar Distance and Level Sensor combines non-contact radar measurement, corrosion-resistant construction and wireless communication for remote environmental and industrial monitoring.

Its 60 GHz radar technology, narrow detection beam, IP68 enclosure and range of communication options make it suitable for liquid level monitoring in wastewater networks, reservoirs, storage tanks and challenging outdoor installations.

Technical support from ES Canada

ES Canada assists Canadian technical users in selecting radar level monitoring solutions according to their measurement range, environmental conditions, communication infrastructure and installation requirements.