Milesight
EM300-SLD Spot Leak Detector
Learn more about leak detection →Water & leaks
Leak
Temperature
Humidity
What It Does
Built for water & leaks.
A spot water leak detector with a 1.5 m probe cable — early warning for leaks under sinks, around tanks and in plant rooms, before water damage spreads. LoRaWAN decoder: Milesight EM300-SLD payload decoder & codec (GitHub)
Highlights
Spot leak detection
Two stainless steel probes catch water the moment it pools — under a sink, by a boiler, in a plant room — before it reaches ceilings, flooring or electrics below.
Ten-year battery
A single Li-SOCl₂ cell lasts over ten years at a ten-minute reporting interval — no ladder, no replacement schedule, no maintenance cost for the life of a typical service contract.
IP67 anywhere
Fully dust-tight and waterproof to IP67, so it survives the condensation, splashes and cleaning regimes common in school kitchens, plant rooms and housing maintenance areas.
Specification
Datasheet (PDF) ↓- Detection method
- Conductive probe — detects conducting liquid when level reaches 5 mm
- Probe cable length
- 1.5 m (customizable)
- Probe material
- Stainless Steel 316
- Temperature range
- −30 °C to +70 °C
- Temperature accuracy
- ±0.3 °C (0–70 °C), ±0.6 °C (−30–0 °C)
- Humidity range
- 0–100% RH
- Humidity accuracy
- ±3% RH (10–90% RH), ±5% RH (below 10% / above 90%)
- LoRaWAN frequency
- CN470 / IN865 / RU864 / EU868 / US915 / AU915 / KR920 / AS923-1&2&3&4
- LoRaWAN mode
- OTAA / ABP, Class A
- Battery
- 1 × 4000 mAh ER18505 Li-SOCl₂ (8000 mAh optional)
- Battery life
- Over 10 years (SF7, EU868, 10-min interval + 24 triggers/day)
- Operating temperature
- −30 °C to +70 °C
- IP rating
- IP67
- Dimensions
- 105.6 × 85.3 × 27 mm
- Installation
- Wall screw, 3M tape or cable-tie
- Certifications
- CE, FCC, ISED, RCM, Telec, ICASA, RoHS
- SKU
- EM300-SLD-EU868
Complete The Setup
You will also need a gateway.
Every LoRaWAN sensor needs a gateway to reach the internet. One gateway covers a whole building — the Milesight UG65 is the standard choice for most sites.
On The Platform
A device on its own, or part of the bigger picture.
Buy this device and run it yourself, or have it monitored on the Planetic platform — live dashboards, standards tracking and automatic alerts, with the compliance evidence kept for you.
Questions
Good to know.
- Do I need anything else to use this device?
- Every LoRaWAN sensor needs a gateway to reach the internet. One gateway covers a whole building — the Milesight UG65 is the standard choice for most sites. The gateway itself does not need a sensor to run.
- Is the price ex VAT?
- Yes — all prices shown are ex VAT. VAT is added at checkout where applicable.
- Can I have it monitored on the Planetic platform?
- Yes. Buy the device outright and run it yourself, or have it monitored on Planetic — live dashboards, standards tracking and automatic alerts, with compliance evidence kept for you.
Get Started
Ready to order, or want to talk it through?
Add it to your cart for checkout, or book a call and we will confirm quantities and the gateway you need for the building.