LB 165/166 Floor Monitor


The Floor Monitor LB 165/166 is a mobile measurement device with large-area proportional counter tubes for the detection of surface contamination caused by radioactive nuclides.

The Floor Monitor is comprised of

  • a trolley with three wheels
  • a detector: Xenon detector or P10 flow-through counter tube
  • a battery or rechargeable battery operated evaluation unit for acquisition (UMo II LB 134)

The Floor Monitor is available in two versions:

The LB 165 monitor operates with the permanently filled Xenon counter tube LB 6376 and measures β- and γ-emitters.

The LB 166 monitor operates with a flow-through counter tube LB 6386 and measures α- and β-emitters. The required continuous counting gas supply (P10 gas bottle with double pressure reducer) is accommodated on the trolley. The P10 gas bottle can easily be exchanged by the user.

The evaluation unit UMo II LB 134 automatically detects the connected detector (Xenon or flow-through counter tube) and sets the program automatically, so that a detector change does not necessitate any new parameter setting. 


  • mobile monitor with adjustable height
  • easy scanning of large floor areas
  • proportional counter tubes with 2000 cm² active area
  • less number of measuring points and so less time-consuming and less expensive
  • ratemeter or counter-time mode
  • alarm thresholds can be set for each measurement mode and each nuclide; exceeding of these thresholds is signaled visually and acoustically
  • up to 250 single results can be stored and printed out