Technological Highlights

Customer benefits

  • Representative measured values due to large measuring volume
  • Accurate moisture measurement
  • Not effected by e.g. temperature, conductivity, pressure, pH-value etc.
  • Different sensor probes for measuring in or through the vessel
  • Can be supplied with density compensation


State of the art technology

  • Proven neutron moisture measurement technology
  • Attainable accuracy ± 0.1 % depending  on application
  • Analog output from sensor (0/4…20 mA)
  • Digital input for “hold signal”
  • Digital outputs for system status and min and max values
  • Sensor operating temperature: -20…+50 °C
  • Density compensation enabled

System description

Neutron moisture measurement is very robust and a proven technology with a long track record of success for moisture measurement on bulk materials; it functions where most other moisture measurement technologies fail for various reasons. The large measuring volume of up to one meter in diameter ensures a representative measured value. Once the system has been installed and calibrated, it can be left alone for several years providing reliable and maintenance-free moisture monitoring of bulk products. The LB 350 can additionally be equipped with bulk density compensation. Bulk density compensation increases the accuracy of the moisture measurement if the bulk density of the product fluctuates.



The surface probe is mounted directly on the outer wall of a bunker. It is cabable to irradiate up to 20 mm thick steel walls. However, the best measuring accuracy is achieved by using our specifically designed mounting frame, which is installed in an opening in the wall. The mounting frame is extremely robust due to the wear-resistant ceramics surface and allows for a quick and easy installation of the probe.

Bunker probe

The probe is mounted in a dip pipe made from steel or ceramics. Typically this dip pipe is inserted in the outlet section of the bunker, so that the probe is fully surrounded by bulk material. Due to the optimum position of the probe inside the material flow, a highly representative measurement is achieved.

Dip pipe with bunker or surface probe

The probe is mounted in a dip pipe, closed at the bottom end, which is installed into the tank at an angle of approx. 30 - 45° to the horizontal. Ideally, the wall thickness of the dip pipe should be between 3 to 5 mm to minimise signal attenuation at the detector. (The signal is reduced by about 5 % per each 1 mm of steel.) We recommend using a hardened dip pipe, or a dip pipe with ceramic jacket, to ensure a long life time, even when working with abrasive products.The dip pipe is available in 3 lengths. 
The surface moisture measurement system should be used when the dip pipe for the bunker probe is subject to a high level of abrasion from falling product
or when the product may fall directly onto the dip pipe.


LB 350 Moisture measurement on bulk materials Brochure

English | PDF | 541.9 KB

Moisture meter LB 350 Manual

English | PDF | 5.9 MB