LB 112 Micro Gamma - stationary dose rate monitor

The LB 112 Micro-Gamma datalogger is a stationary monitor for one or two independent detectors or for a low dose / high dose rate measuring system. The operation of the device is controlled with a simple menu and softkeys.

Operation of the LB 112 is carried out with five softkeys located below the vacuum fluorescence display with adjustable brightness. All parameters are protected by a password.

An info key calls up a menu with important information during the measurement:

  • alarm conditions
  • raw data
  • alarm thresholds
  • further parameters

If the dose rate unit changed, the results are automatically renormalised. The dose rates are also available as output currents via the two analog outputs 0/4-20 mA, in a linear or logarithmic scale.



  • Compact measuring device for wall installation made of stainless steel with IP65 tightness
  • Connection of up to two dose rate probes or other detectors (single or dual probe operation)
  • Low dose / high dose rate system
  • Radioactive gas monitor
  • Ratemeter or scaler timer mode
  • Memory for 4000 data points
  • Electrically separated in- and outputs, e.g. RS232/RS485 interfaces, USB interfaces,  Ethernet interfaces, 3 digital inputs, 2 analog outputs, 5 relay outputs
  • Data transfer and communication in local and large area measuring networks
  • Network capable with F2C protocol
  • Easy to read graphical vacuum fluorescence display
  • Measuring station with alarm signals (lamps, flashlight, horn) for local warning functions
  • Local warning functions freely programmable with the option to reset the acoustic signal
  • Protection of the measuring parameters by a password and internal jumpers
General technical specifications1
Measuring modes ratemeter and scaler/timer
Display vacuum fluorescence (64 x 128 pixel)
Memory up to 4000 data sets
Power supply wide range 85 to 264 VAC or 9 to 36 VDC
input depending on supply module
Power consumption approx. 12 W
Temperature range -5 °C to 50 °C
Relative humidity 10 % to 80 %, non condensing
Protection degree IP65
Dimensions 200 x 200 x 80 mm³
Weight 2.6 kg, stainless steel housing
Micro-processor electronics
Low power consumption microprocessor unit for parameters and measured data
256 kB EEPROM memory
Real time clock
Two 6 pin connectors for two probes
Power supply for probes ± 5 VDC, ± 15 VCD, power < 60 mA
Normpulse input
Control voltage for high voltage supply within the probes 0 – 5 VDC, positive
Electrically separated in- and outputs
3 digital inputs
2 current outputs (0/4-20 mA)
5 relay outputs
2 serial interfaces as RS 232 or RS 485 (max. 1200 m, max. 32 devices per bus)
USB / Ethernet
Dose rate probes H*(10)
LB 6500-4-H10, GM-probe0.1 μSv/h to 10 mSv/h 65 keV to 1.3 MeV
LB 6500-3-H10, GM-probe1 μSv/h to 1 Sv/h 50 keV to 1.3 MeV
LB 6360-H10, Proportional counter50 nSv/h to 20 mSv/h 35 keV to 1.3 MeV
LB 6701L-H10, Ionisation chamber10 μSv/h to 10 Sv/h 50 keV to 1.3 MeV
LB 6701M-H10, Ionisation chamber100 μSv/h to 100 Sv/h 50 keV to 1.3 MeV
LB 6701H-H10, Ionisation chamber1 mSv/h to 1000 Sv/h 50 keV to 1.3 MeV
LB 6411 for neutrons30 nSv/h to 100 mSv/h 10 meV to 20 MeV