Radon Sensors TSRS (UART) and TSRS2 (RS485 – MODBUS)

Intelligent detectors of radon concentration with simple serial interfaces UART, RS485 – MODBUS and RELAY for easy implemention into third party system. Suitable for integration into smart buildings, industrial systems and systems of air quality. Connection of probe is always by 4 – wires, 2 wires are for serial half-duplex data or for relay and 2 wires for DC powering. Coupled with sensors are delivered descriptions of interfaces and protocols for easy development and implementation of processor program. Current values of radon concentration, temperature and humidity are possible to read from sensors and also set limit for switching of alarm relay. Also is possible to download time records of radon concentration and energy spectrum from sensor internal memory.

TSRS sensor has alarm RELAY and wired serial interface UART. RELAY is design for remote alarm signalization of crossing radon limit over 4-wires cable (severel 100 meters). UART interface is design for direct connection with processor unit for short distance (severel meters) over 4 –wires cable too. Powering from +5VDC to +12VDC.

TSRS2 sensor with wired serial interface RS485 is design for bus connection of more sensors with processor unit for long distance (severel 100 meters). Powering is in range +7VDC to +15VDC. Communication type and rate is possible to set by external switches as well as bus address of device.

Product Specification 
Average measurement sensitivity0,25 imp/hod/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)
Radon concentration results displayshort-term (1 hour moving average)
long-term (24 hours moving average)
Measuring relative humidity range0 – 100 %
Measuring temperature range-40 to +125 °C
Serial interfaceUART, RS485-MODBUS
Switching load of alarm relay250W DC/ 500W AC
Records saving interval1- 255 minutes, default 1 hour
Results memory capacity in probe4096
Powering5-12VDC/max. 5mA (UART);
7-15VDC/max. 15mA (on request: 5VDC/2 mA) (RS485)
DimensionØ 80 x 175 mm
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



USB<->UART adapter for TSRS

(For better SW debugging or possibility to try usbRADONview application).

USBUART adapter for TSRS