Technological Highlights

Customer benefits

  • Representative measured values due to large measuring volume
  • Accurate moisture measurement
  • Not affected by e.g. temperature, conductivity, pressure, pH-value etc.
  • Measures through the vessel wall
  • Can be paired 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 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 measuring a volume with diameter of up to one meter ensures a representative measured value. Once the system has been installed and calibrated, it can be left alone for several years providing reliable moisture monitoring of bulk products. The LB 350 also 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 of measuring through steel walls up to 20 mm thick. However, the best measuring accuracy is achieved by using our mounting frame, which is installed in an opening in the wall. The mounting frame is extremely robust due to the wear-resistant ceramic surface and allows for quick and easy probe installation.

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.