M-Sens 2 - Medición de humedad en contínuo

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M-Sens 2 -
Medición de humedad en contínuo

El sensor de microondas para la medición en contínuo de la humedad de sólidos secos a granel

Instalación sencilla para medición a la salida de contenedores, tornillos de transporte, cintas transportadoras, toboganes, etc.

  • Rangos de humedad entre 0….65 % (dependiendo del material)
  • Precisión de la medición 0,1%
  • Medición en contínuo de la humedad
  • Independiente de la color de material
  • Resistente a la temperature hasta 120 °C
  • Disponible version con aprobación ATEX
  • Registro de la humedad superficial e interna del producto. 


The M-Sens 2 is used for the continuous measurement of humidity on solids
of all kinds.
The M-Sens 2 sensor can ideally be used, for example in container outlets, conveyor belts, conveyor screws, mixers and conveyor dryers.
It is important that the measuring surface of the sensor is always covered with material. The M-Sens 2 is a contact-measuring procedure. The ceramic disc (measuring surface) must always be covered with material.


The M-Sens 2-sensor works with precise high-frequency measurements and direct digitalisation of the measurement values and thus a high resolution.
Since the surface and capillary humidity of a material has a strong influence on its dielectric constant, the humidity can be determined exactly given a constant medium bulk density. By way of support, any fluctuations of the measuring value caused by the bulk density are balanced through an internal filter function. Temperature-related fluctuations of the measuring value are automatically compensated by the sensor. The calibration of the system can easily be carried out by the operator. On the installed system, the calibration is a matter of pushing a button and entering the humidity reference value.

Mounting and Installation

Flexible positioning
The M-Sens 2 was developed to offer maximum flexibility during assembly. The following aspects should be taken into account in the positioning of the probe: The measuring field penetrates the densest materials (e. g. sand). With a minimum depth of 120 mm, the probe should always be directed at the material to avoid reflection problems. 
Installation situations

For a simple installation, a standard connection flange is available.  





 Conveyor belt

Measurement of material moisture on a conveyor belt.
A constant material height is generated by attaching a material skimmer. This offers ideal conditions for an online measurement.




 The installation in the lower third of a conveyor screw has the advantage that the material volume that passes over the sensor is almost constant, allowing for an optimal measurement. The movement of the auger flights is hidden.




 Free fall pipe

To be able to measure in free fall pipes or inclined pipes (chutes) with the M-Sens 2, it is possible to gather material in front of the probe in the short term, for the duration the measurement, with a catching mechanism. After the measurement, the flap will open again and allows the gathered material to continue to drop. The measuring process can be permanently repeated in short or long intervals according to requirements.    

Technical Data

Sensor Housing Stainless steel 1.4571
  Sensor surface Ceramic
  Protection category IP 67 according to EN 60529
  Ex-protection (optional) Zone 20 (dust), zone 0 (gas)
  Material ambient temperature 0 ... + 120 °C
  Working pressure max. 10 bar
  Power consumption 0.6 W
  Weight approx. 1.0 kg
  Response time 0.1 seconds
  Measuring range 0... 65 % residual moisture (depending on material)
  Accuracy 0.1 % absolutely in the calibrated measuring range
  Connecting cable shielded cable 4-wired, 0.25 mm²
Transmitter Power supply 110/230 V AC (50 Hz) 24 V DC
  Power consumption 20 W / 24 V
  Current consumption max. 1 A at 24 V
  Protection category IP 65 according to EN 60529/10.91
  Operating temperature - 10... + 45 °C
  Dimensions 258 x 237 x 174 mm (W x H x D)
  Weight approx. 2.5 kg
  Interface RS 232, RS 485
  Cable glands 3x M16 (4.5-10 mm Ø)
  Cable cross section 0.2 - 2.5 mm² [AWG 24-14]
  Current output signal 1 x 4 ... 20 mA (0 ... 20 mA), load < 500 Ohm
  Switched output measuring alarm Relay with two-way contact max. 250 V AC, 1 A
  Digital inputs 2 inputs for active external control signals
  Data protection Flash

Application examples

Click on a desired application example to navigate to a detailed description.

online humidity measurement of
wood chips in the silo

online humidity measurement of coal
underneath a conveyor screw

online humidity measurement of
titanium oxide in a conveyor screw

online humidity measurement of fertiliser
on a carriage on the
conveyor belt

online humidity measurement of
wood shavings on a carriage

online humidity measurement of
potato powder on a slide

online humidity measurement of saw dust
in a screw conveyor

Humidity measurement of fly ash
with M-Sens 2

Humidity measurement
of brown coal


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