Battery-powered radon sensor
Continuous radon monitoring, without a single cable
Radon is a natural radioactive gas and the second biggest cause of lung cancer after smoking. It is usually checked with a passive detector left in a room for three months and posted to a laboratory, which gives one average figure, weeks later.
We have had our own wireless radon monitor developed to do better. It is battery powered, with no power cable, no data cable and no socket needed, and it runs for five years and more on one battery. It reports around the clock over LoRaWAN, so you can see overnight peaks, the effect of heating and ventilation, and whether remediation has worked.
Why a wireless radon monitor
Radon needs measuring in the places that are hardest to wire.
Measure where radon collects
Radon builds up in cellars, basements and ground-floor rooms, which are rarely where the sockets are. With no cables, the monitor goes where the reading needs to be taken.
Five years and more on a battery
No electrician, no trailing leads and no battery round to plan. Fit it, join it to the network and leave it.
It stays in place
A plug-in monitor can be unplugged to free a socket, and the readings stop. A wireless monitor on the wall keeps measuring, so the long-term average is complete.
How the radon monitor works
Radon diffuses in
Air passes through the side vents into a passive diffusion chamber, where the monitor detects the alpha particles given off as radon decays. There is no pump drawing air through it, which is why the battery lasts so long.
Readings go over LoRaWAN
Readings are sent over LoRaWAN, the long-range, low-power radio network built for battery sensors. It reaches deep into buildings and needs no Wi-Fi, no SIM and no broadband.
You see them live
Live levels in Bq/m³, daily and seasonal patterns and long-term averages appear on a dashboard, with an alert by email or SMS when a level you set is passed.
The monitor
Compact, quiet and designed to be left alone.
Continuous radon monitor or three-month passive detector?
Both have a place. A passive detector gives a formal one-off figure; a continuous monitor shows what is actually happening, and keeps watching.
| Three-month passive detector | IoT CI wireless radon monitor | |
|---|---|---|
| What you get | One average figure, posted back weeks after the test | Live readings around the clock, plus long-term averages |
| Daily and seasonal patterns | Hidden in the average | Visible: overnight peaks, heating and ventilation effects |
| Alerts | None | By email or SMS when a level you set is passed |
| Checking a remediation | Another three-month test | Results within days of the work |
| Ongoing monitoring | A new test each time | Continuous, for five years and more on one battery |
| Best for | A formal one-off measurement | Ongoing monitoring, remediation checks and many rooms or buildings |
Radon levels: what the numbers mean
Radon is measured in becquerels per cubic metre (Bq/m³). These are the levels used in the UK.
UK Target Level for homes, the level to aim for when reducing radon
UK Action Level for homes, above which action is recommended
Reference level for workplaces under the Ionising Radiations Regulations 2017
Radon is highest in areas with granite and some other rocks, including the Channel Islands, Cornwall, Devon and parts of Wales, Scotland and Northern England. In Jersey, the island's own radon guidance estimates that at least 12% of homes may have radon at a level that needs action. Read our guide to radon in Jersey and Guernsey.
What you get
- Live radon readings in Bq/m³, around the clock
- Long-term averages to compare with the UK Action Level and workplace reference level
- Alerts by email or SMS when a level you set is passed
- Before-and-after evidence that remediation has worked
- Works on any LoRaWAN network, or on ours
- Supplied on its own, or with connectivity, dashboards and alerts
At a glance
- Power
- Battery, five years and more
- Connectivity
- LoRaWAN, no Wi-Fi or SIM needed
- Measurement
- Continuous radon, in Bq/m³
- Size
- About 10 cm square, under 4 cm deep
- Mounting
- Keyhole slot for a single screw
- Specification
- Full datasheet on request
Who uses a wireless radon monitor
From a single room to a whole estate.
Landlords and housing providers
Radon is a hazard landlords must consider. Monitor homes in radon-affected areas without disturbing tenants or relying on a spare socket, and prove that remediation worked.
Employers and workplaces
Employers must assess radon risk, and the workplace reference level is 300 Bq/m³. Continuous readings show exposure through the working day, not just an average.
Schools and public buildings
Ground-floor classrooms, offices and basements, measured continuously with no cables to trip over and nothing for anyone to unplug.
Homeowners in high-radon areas
In Jersey, Guernsey, Cornwall, Devon and other granite areas, see how your home's radon level changes with the weather, heating and ventilation.
Radon surveyors and remediation firms
Show clients before-and-after results within days of a sump or ventilation going in, rather than waiting for another three-month test.
Works on your LoRaWAN network, or ours
The monitor is a standard LoRaWAN radon sensor, so it joins the network you already have. We supply payload decoders and an integration guide for ChirpStack, The Things Network (The Things Stack) and Helium, and the readings can flow into your own dashboards, building management system or data platform.
No LoRaWAN coverage yet? We design and run LoRaWAN networks across the Channel Islands and the UK, and one gateway can cover a whole building or estate.
Radon monitoring as a service
Prefer not to run anything yourself? We supply the monitors, the connectivity and the dashboards, set the alert levels with you and keep it all running. See radon monitoring.
Radon monitor questions
How long does the battery last?
Five years and more in normal use. Battery life depends on how often the monitor reports, and at the standard setting it comfortably exceeds five years. There is no power supply, so there is nothing to plug in or wire.
Does the radon monitor need Wi-Fi or a power socket?
No. It is truly wireless: it runs on its own battery and sends its readings over LoRaWAN, so it needs no Wi-Fi, no broadband, no SIM card and no power socket.
What network does it use? Do I need a gateway?
It is a LoRaWAN device, so it needs LoRaWAN coverage. It works with ChirpStack, The Things Network (The Things Stack) and Helium, and we supply the decoders and an integration guide. If there is no coverage where you need it, we can supply and install a gateway, or connect the monitor to our own network.
How often does it report?
It measures continuously and sends readings throughout the day, typically every hour, so you see overnight peaks and the effect of heating and ventilation as they happen.
Can it replace a three-month radon test?
For a formal measurement to compare with the Action Level, UKHSA recommends a validated passive test over three months. A continuous monitor complements that: it shows how radon changes from hour to hour, confirms quickly whether remediation has worked, and keeps watching for years afterwards.
What radon level is safe?
There is no completely safe level of radon, but the risk rises with exposure. In the UK the Action Level for homes is 200 Bq/m³ and the Target Level is 100 Bq/m³. For workplaces, the reference level is 300 Bq/m³ as an annual average.
Where should I put a radon monitor?
In a room that is used regularly, such as a living room, bedroom or office, on the lowest occupied floor. Keep it away from windows, external doors, vents, radiators and direct sunlight, which can all skew the reading. The keyhole slot on the back lets you hang it on a single screw.
Is it suitable for workplaces and rented homes?
Yes. It is designed for landlords, housing providers and employers who need to assess and manage radon across many rooms or buildings, with dashboards, alerts and an evidence trail.
Do you supply outside Jersey?
Yes. We are based in Jersey and supply radon monitors across the Channel Islands, the UK and Europe, on their own or with connectivity, dashboards and alerts.
How much does it cost?
It depends on how many monitors you need and whether you want connectivity and dashboards with them. Tell us about the rooms or buildings you need to cover and we will send a quote and the full specification.
Read how we developed the monitor, or see the other sensors and devices we deploy.
Order wireless radon monitors
Tell us how many rooms or buildings you need to cover, and whether you need connectivity and dashboards too. We'll send a quote and the full specification.