SIGFOX Wireless Radon Probe TSR 4S

  • On-line monitoring of measured results on WEB (radon concentration, temperature, humidity)
  • Alarms over SMS, email, call if radon cross the limit
  • Internal memory for backup of measured results (downloading over USB)
  • Monitoring of GPS position on map
  • Accumulator life up to 1 year after full charging or using permanent power adapter 230V
  • User friendly web application, graphs, data export
  • Unique web access for management of probes
  • Waterproof cover for electronics (IP67)

Portable radon measuring probe with rechargeable accumulator allows to watch radon results remotely over wireless mobile network of Internet of Things (IoT) SIGFOX. The probe can be placed anywhere in the world where this mobile network has coverage. The probe autonomously sends in regular intervals measured result over wireless network SIGFOX to web server where is possible to view and download results via internet and internet browser in web application TESLA – MONTES. Coupled with delivery is charged wireless connectivity and web application regular service fee. Configuration of probe and setting regular interval of sending are made over USB port and application in PC. Probe includes GPS module for better localization in wider measurement networks. It is similar like TSR 4 probe only with another type of wireless communication SIGFOX.

Probe is designed for continuous measuring of radon concentration. Portable probe basis is a measuring chamber with a semiconductor photodetector. Radon enters the chamber by diffusion through the input filter on the bottom of probe. The probe measures in autonomous and time continuous way. It processes results every 2-minute intervals and from this counts radon concentration (1 hour moving average – average of 30 2-minute process intervals). The probe sends results to server and saves time records in its internal memory (typically at an interval of 1 hour). Next saved value to internal mamory is time record of measuring energy spectrum (typically at an interval of 12 hours). The probe can be switched on/off by switch. LEDs „STAT“ a „CHRG“ indicate current status of probe.

Product Specification 
Average measurement sensitivity0,25 count/hour/Bq.m-3
(method RaA+RaC; 15°C ÷ 30°C; rel. hum. 20% ÷ 40%)
Measuring rangeMDA – 100 000 Bq/m3;
MDA = 100 Bq/m3 per 1 hour or 20 Bq/m3 per 24 hours
Measurement uncertainty< 13% at 300 Bq/m3 per 1 hour;
< 3% at 300 Bq/m3 per 24 hour
Measuring chamber capacity0,176 dm3
Response rate< 30 minutes (RaA); < 3 hours (RaA + RaC)
Radon measurementRaA (recorded in internal memory)
RaA + RaC (WEB and recorded in internal memory)
Measuring relative humidity range0 – 100 % (WEB and recorded in internal memory)
Measuring temperature range-40 up to +125 °C (WEB and recorded in internal memory)
Results sending and saving interval15 – 255 minutes, default 1 hour
Results memory capacity5000 records; 300 spectra
Poweringinternal rechargeable accumulator; charging via USB
Accu life after full charging> 1 year
Radon concentration results displayshort-term (1 hour running average)
long-term (24 hours running average)
DimensionØ 80 x 175 mm
WaterproofIP67 (only for electronics)
Radio technologySIGFOX RC1 868 MHz
Operating conditions
Temperature-10°C to +40°C
Recommended relative humidity *10% – 75%
Maximum working relative humidity0% – 99%
Absolute humidity5-20 g/m3
Detector life50-100 million pulses
Ø 1000 Bq/m3 ->12 years
Ø 10 000 Bq/m3 ->1 year

* Increased humidity reduces the life of a charged battery.
* There must be no condensation of water in the chamber – erroneous results


Probe holder

Transport waterproof case

Outdoor cover with solar powering


Other Tools


Computer program from SURO (NRPI) for visualization and analysis of data files exported from radon concentration measurement devices made by TESLA (RADIM 3X a TSRX) and made by SAPHYMO-BERTIN (ALPHAGUARD).