Online residual moisture measurement

M-Sens WR3

Sensor for continuous moisture measurement in dry bulk solids

Sensors for continuous moisture measurement and installation on conveyor belts, screw feeder or hoppers.
This extended moisture range sensor covers a wide range of applications. The sensor penetrates the product for most reliable measurements. High frequency based sensor for high resolution and accuracy.

  • highly resistant to abrasion
  • extended measurement range, up to 85 % moisture
  • high temperature version up to 190 °C
Reliable moisture measurement with high resolution
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  • Cement
  • Chemistry
  • Asphalt
  • Food
  • Glass
  • Grain
  • Lime
  • Minerals
  • Steel
  • Wood
  • Foundry
  • Construction materials
  • Biomass
  • Recycling
  • Building materials
  • Power plant

Application examples:

  • Moisture ranges 0 … 85 % (depending on material)
  • Measurement accuracy 0.1 %
  • Online moisture measurement
  • Recording of surface moisture and capillary moisture
  • Independent of the material colour
  • Temperature-resistant up to 190 °C
Technical Specifications
Material to measure Dust, powders or granulates
Place to measure Screw conveyor, belt conveyor, container, slide, dryer, mixer
Technology Capacitive
Moisture range 0 to 85% (depending on application)
Material temperature Max. 80°C (optional 190°C)
Temperaure measurement Not included
Mounting Flange / Clamp
Output 4…20mA, Modbus, Profibus
Sensor Technical Data
Housing Stainless steel 1.4571
Sensor surface Ceramic
Protection category IP 67 according to EN 60529
Material temperature Max. 80°C (optional 190°C)
Working pressure Max. 1 bar
Power consumption 0.6 W
Response time 0.1 sec
Weight Approx. 1000 g
Measuring range 0 … 85 % residual moisture
(depending on material)
Accuracy 0.1 % absolutely in the calibrated measuring range
Connection cable shielded cable 4-wired, 0.25 mm2
Transmitter Technical Data
Transmitter (DIN Rail) Transmitter (field housing)
Power supply 24 V DC ±10 % 110 / 230 V AC 50 Hz
(optional 24 V DC)
Power consumption 20 W / 24 VA
Protection type IP 40 to EN 60 529 IP 65 to EN 60 529/10.91
Ambient operating temperature -10 … +45 °C
Dimensions (W x H x D) 23 x 90 x 118 mm 258 x 237 x 174 mm
Weight Approx. 172 g Approx. 2.5 kg
Connection terminals cable
0.2-2.5 mm2 [AWG 24-14]
Current output 1 x 4 … 20 mA (0 … 20 mA),
load < 500 Ω
3 x 4 … 20 mA (0 … 20 mA),
load < 500 Ω
Interface RS 485 (ModBus RTU) / USB
Pulse output Open collector – max. 30 V, 20 mA
Relay contact Max. rated load: 250 V AC
Max. peak current: 6 A
Max. rated load 230 V AC: 250 VA
Max. breaking capacity DC1: 3/110/220 V: 3/0.35/0.2 A
Min. switching load: 500 mW (10 V / 5 mA)
Data backup Flash memory


Flexible positioning
The M-Sens WR3 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 WR3, 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.



Operating Instructions

ENVEA’s Process Catalogue

Multi-Sensor-Software MSE300

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