Alpha Beta Particulate Monitor UDAS-201M

For supplies to the Russian Federation

Certificate of measuring tool type approval №31712, valid till 28.11.2018

Radiation monitoring method attestation certificate №40090.0ГА214

measurement of alpha and beta aerosol volumetric activity in air of rooms and ventilation system at NPPs, radiochemical plants and other radiation hazardous sites

Main features and functions:

  • measurement of alpha and beta aerosol volumetric activity in air, and data display or data output via RS485
  • automatic gamma-background compensation
  • automatic self-testing, alarm signal generation, alarm signal display and alarm output via RS485
  • three alarm threshold levels (warning level and two emergency levels)
  • alarm of measured value "minor change"
  • "dry-contact" signal of threshold value is exceeded
  • standard (0...20mA / 4...20mA) analog output for measured data transfer to external systems
  • standard (0...20mA / 4...20mA) analog input for external device connection and its measured data consideration in algorithms
  • pumped air monitoring and consumption measurement
  • built-in air consumption agitator
  • sampling line connection
  • unified and replaceable components for all "RADSYS" system devices

Performance specification

Measurement range

1×10-2 ÷ 1×104 Bq/m3 (alpha-radiation)
1×100 ÷ 1×106 Bq/m3 (beta-radiation)

Energy window

4,2 ÷ 5,5 MeV (alpha)
0,08 ÷ 2,00 MeV (beta)

Operating temperature range

0 to +55 °С

Operating pressure range

84,0 to 106,7 kPa

Operating humidity range

up to 98 % at +35 °С

Relative error

not more than 50 %

Protection index


Dimensions and weight

1406х529х708 mm; not more than 120 kg

Corresponds to 4 class requirements according to NP-001-97 (OPB-88/97)

Power supply

220 V

Power output

406 VA