Ursalink (Milesight) EM300-SLD | URS-EM300-SLD

LoRa leakage sensor

Reliably detects water leaks
Measures temperature and humidity in industrial environments, cold rooms and outdoors
Enormous wireless range – no comparison with WiFi
Replaceable batteries with a service life of around 3 years
Plug & play integration with the LineMetrics platform


The LoRa leakage sensor is a compact sensor for detecting water leakage (e.g. leaks, burst pipes) as well as temperature and humidity. Its IP67 housing protects the sensor and enables trouble-free operation in cold rooms, industrial environments and outdoor areas. Leakages are transmitted on an event basis so that an immediate response is possible. Temperature and humidity are transmitted at 10-minute intervals.

The sensor also has a long radio range inside buildings and a battery life of around 3 years. Thanks to a special transmission protocol, maximum availability of the measured values (>99%) can be achieved even at long ranges and in challenging environments. This also makes the sensor suitable for data acquisition as part of processes and quality tools that require auditing (e.g. HACCP or GxP). Thanks to LoRa wireless technology, significantly better penetration of insulated cold room walls can be achieved than with conventional technologies.

Technical data

    • Leakages: spot detection, sends status changes based on events
    • Temperature: -30° to 0°C (+/-0.6°C) / 0° to +70 °C (+-0.3°C)
    • Humidity: 10 – 90% RH (+-3%) / <10% and >90% RH (+/- 5%)
    • Transmission interval: 10 minutes (temperature/humidity)
    • Data availability: >99% even at long radio distances
    • LoRa radio range: max. 8km outdoor / some 100m indoors
    • Power supply: 1x 4000mAh ER18505 Li-SOCL2 batteries, runtime depending on connection quality sensor <-> LoRa Gateway (approx. 3 years with average connection)
    • Operating environment: suitable for outdoor applications or harsher environments (production environment, deep-freeze measurements)
    • Size & weight: 88 x 87 x 27 mm, 90 g
    • Scope of delivery: Sensor, instructions, QR sticker, mounting material

Measuring points

Data acquisition

  • The installation site is monitored for water leaks. If the sensor comes into contact with water, an even-based message is transmitted.


This screenshot shows how a water leak was detected in a pipe. After drying, the sensor has changed status again.

Data acquisition

  • The air temperature in harsh environments (outdoor, production, cold room, …) is recorded and transmittedevery 10 minutes.
  • Value range: -30° to 0°C (+/- 0.6°C) / 0° to +70 °C (+-0.3°C)


Temperature profile for a month in a warehouse for electrical materials. As can be seen, critical temperature values of 0°C and below were not reached. The color-coded areas can be configured individually.

Data acquisition

  • The relative humidity in harsh environments (outdoor, production, cold storage, …) is recorded andtransmitted every 10 minutes.
  • The optimum operating range of the sensor is between 10% and 90% RH. Outside this area, make sure that the environment is non-condensing.
  • Value range: 10 – 90% RH (+-3%) / <10% and >90% RH (+/- 5%)


Relative humidity curve over one month in a warehouse for electrical materials.

Recommended use cases

Detect Leakages (Water, Oil, etc.)

Temperature monitoring and recording in cold rooms

Constant Storage Conditions

Is your use case not included?

Tested for you: The best sensor on the market

This sensor has prevailed against comparable models in our test laboratory and has proven itself in practice.

Enorme Funkreichweite: Ganze Gebäude abdecken

Many kilometers of range outdoors or hundreds of meters indoors – no comparison with WiFi! More >

Battery-operated with with around 3 years runtime

LoRa radio is very energy efficient. Depending on the quality of the wireless connection, the batteries will last for many years.

Plug and Play

Plug & Play integration into the overall system

It’s easy to obtain your first measurement data in just a few minutes thanks to the modular system – from the sensor to the cloud.

Your benefits with the LineMetrics platform

All-in-one: A complete system for room monitoring

1. Detect leaks & co

The battery-operated wireless sensor can be installed anywhere, e.g. in storage/cold storage rooms. It reliably records all values and transmits them via LoRa.

2. transmit measurement data

The LoRa wireless gateway creates a wireless network for up to 1,000 sensors. The collected measurement data is transmitted to the cloud via mobile radio.


3. evaluate and alert

All sensors are managed and all measurement data stored in the cloud. Analyses, alerts and data integration via API are easily possible.

What is behind it? Find out what LineMetrics can do to help you easily obtain the measurement data you need.

Developing and operating an IoT-based monitoring solution is more complex than many people think. Here is just a small excerpt of what LineMetrics can do for you in the background so that you can easily and reliably obtain the measurement data you need:

  • Selection of international suppliers, supply chain management and price negotiations
  • Selection and testing of individual hardware devices, hardware quality management
  • Device and firmware management
  • Optimizations in terms of radio range and battery life
  • Database management
  • Connectivity management (SIM cards)
  • Security and encryption, including updates
  • Creation of instructions and support during rollout
  • 24/7 monitoring of the entire solution, support in the event of problems

Cloud platform: Analyze and process measured values

The LineMetrics Cloud allows you to create individual dashboards on which you can keep an eye on the data that is most important to you. Measured values can be displayed, combined and colored in the form of bars, curves, dial gauges, etc. This screenshot shows past and current measured values of the sensor:

Warning messages can be created for individual ranges/limit values and provided with a trigger delay. This means that no warning is sent if critical values are only briefly exceeded. A second condition for triggering a warning can also be configured.

Alerts can be sent by e-mail (see screenshot) or SMS. The recipient, subject and message can be easily configured individually.

Plug & play: obtain measurement data quickly and easily (< 3 minutes!)

The LineMetrics complete solution enables the solution to be commissioned via plug & play – without technicians, IT department, cable laying and network access. We will send you all the hardware with all accessories and simple commissioning instructions. The first measurement data can be analyzed in the LineMetrics Cloud within a few minutes. For questions, problems and tips, we have set up a comprehensive service center for you and can of course also be contacted personally at any time.

Instructions included

Specially created commissioning and installation instructions, printed and available online. Example >

Includes LiSOCl2 batteries

Highest energy density and constant voltage level over the entire discharge period.

Mounting material included

3M VHB adhesive pads and/or screws (TX20) as well as dowels from Würth are included.

Includes QR Code Sticker

Read measured values on your cell phone: Simply scan the QR code and view the values. Try it out >

Enterprise-ready: The flexible and future-proof business solution


Strict quality criteria

Our quality requirements include not only certified hardware, but of course also the security of your data. LineMetrics therefore relies exclusively on highly encrypted communication and multiple redundant servers in high-security data centers in the DACH region.


Efficient roll-out

A fast and cost-effective roll-out is possible with employees on site, no matter how many locations, no matter where in Europe. Everything required for commissioning and operating the solution is included – right down to the SIM card with LTE data package.

Professional support

A competent contact for questions, whether it’s about sensors, wireless connections, databases or dashboards. In addition, the help center, knowledge base and support ticket system are available 24/7.

API Schnittstelle

Simple integration (API)

Existing software and apps can continue to be used and automatically enriched with sensor data via API. This does not change existing processes and IT systems.

Do you have any questions or would you like a specific offer?

To the sensor overview >