Compact Moisture Measuring Sensor

The AMMS sensor combines the advantages of calibration in the process with a direct measured-value transfer (e.g. 4…20mA) brought together in a compact version

Moisture measurement for detecting the water content of bulk solids. The moisture sensors are working with the capacitive measuring principle. Measurable materials are: pellets, biomass, woodchips, sawdust, gypsum, grain, cocoa, coffee, concrete, sand ...

Compact but complete

Just a sensor! No evaluation unit necessary

Calibration within the process

Sensor adjustment while already installed

Direct output module

Analogue standard signal (e.g. 4...20mA) directly from the sensor

Multi-point calibration

For even better measuring results



  • Capacitive moisture measurement
  • Temperature range of measuring material 4…70°C
  • Electronic temperature compensation
  • Direct measured-values transfer from the sensor
  • Multi-point calibration
  • Integrated averaging
  • Comfortable, clear calibration software, optional
  • Alternative: "direct“ calibration without software possible


  • Integrated temperature sensing device (Pt100) optional
  • Several analogue standard signals like 4…20mA / 0…20mA / 0…10V
  • Sensor for measurement in a silo
  • Sensor for measurement in a mixer

Download datasheet (PDF)

The AMMS sensor with its integrated microprocessor establishes a transition between the DMMS system and the analogue moisture measuring sensor MMS. 

Beside a power supply this sensor only needs a display or a PLC which is waiting for its measuring value. The AMMS sensor has been designed for applications which do not need a multi-pieced system but benefit of a precise on-line calibration that is able to compensate the influences of the installation. It's also possible to calibrate the AMMS sensor directly by an integrated rotary encoder. This work actually takes place before the sensor has been installed. 

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By the way:

ACO provided full service: A distinguished advice, followed by optimal positioning of sensors based on many years of practical experiences, all integration components, as well as calibration of the measuring system, combined with teaching your staff.