WLAN wireless Radon Probe TSR 4A

Probe for Radon Concentration Measurement in buildings with Wireless and USB data transmission.

  • Standalone measurement with saving data into own internal memory
  • Direct USB connection of probe and a PC; application free
  • Wireless data transmission via wireless Central Unit
  • Internal high-capacity rechargeable accumulator; accu life after full charging up to 1 year
  • USB charging or power adapter 230V/50Hz
  • Probe measurement possible to turn off by switch while real time in probe keeps on
  • Diagnostic LED diodes ‘charging’ and ‘status’
  • Waterproof cover for electronics (IP67)
  • Option of probe with display on request

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 in 2-minute intervals and from this counts short-term moving average of radon concentration (0,5 hour moving average – average of 15 2-minute process intervals from RaA(Po218)). It also counts long-term moving average of radon concentration (24 hours moving average from RaA(Po218)+RaC(Po214)). The probe saves time records of these radon concentration values RaA; RaA+RaC, including values of humidity and temperature within its internal memory (typically at an interval of 1 hour). Next saved value is time record of measuring energy spectrum (typically at an interval of 12 hours). The probe is random for location in measured place, but generally it is put on the bottom of the probe. Bottom of the probe cannot be covered. The probe can be switched on/off by switch. LEDs „STAT“ and „CHRG“ indicate current status of probe.

The resulting values can be downloaded continuously during measurement or at once at the end of measurement. Data from the radon probe can be downloaded to a PC directly via USB interface or wirelessly via antenna and Central Unit. Central Unit is not included with package and it is sold and delivered extra.


  • Continuous monitor of radon volume activity – radon concentration electronic measuring 20 – 100 000 Bq/m3
  • Current radon concentrations – short-term (hourly average) and long-term (daily average)
  • Measurement uncertainty – < 13% at 300 Bq/m3 per 1 hour; < 3% at 300 Bq/m3 per 24 hour
  • Measuring algorithm – Calculation from RaA or from RaA +RaC impulses
  • Accompanying measurements – temperature, humidity, energy spectrum
  • Long-term records – results stored in internal memory for the period up to 208 days, export for spreadsheet


  • USB interface – data are downloaded directly via USB into PC
  • Wireless interface – data are downloaded wirelessly via mobile Central Unit (supplied extra)
  • Remote Access – Data from Central Unit can be downloaded over LAN or internet access.
  • PC application – data managing, viewing, export and system configuration by PC application, Czech, English, German, Italian language


  • High Mobility – Portable device – easy equipment transfer between locations
  • Nondestructive Installation – Internal accumulator with battery life more than 1 year without charging
  • Autonomous Measuring – Each probe separately measures and stores data into internal memory
  • Data Download Options – Continuously or one-time after measurement end
  • Wireless Network – Up to 16 elements with one central unit
  • Wireless Range – Can be increased by repeaters
  • Technical Support – Extensive services directly from manufacturer
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)
Measuring algorithmquicker, less sensitive (calculated from RaA)
slower, more sensitive (calculated from RaA + RaC)
Measuring relative humidity range0 – 100 %
Measuring temperature range-40 to +125 °C
Radio interface868MHz
Max number of measuring network elements16
Probe to terminal unit distance (RF range)depends on number of walls and building material, up to 600 m in open space
Possibility of using repeater for RF range extendingyes
Results memory capacity5000 records; 300 spectra
Results memory capacity in probe (autonomous measuring)150 days
Poweringinternal rechargeble 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)
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

Spare antenna

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).

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