Continuous level measurement for grain silos with Mollet

June 20, 2022
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Continuous level measurement for grain silos with Mollet-0

1. Mollet MOLOSwave series sensors for continuous level measurement

MOLOSwave series sensors are specifically designed for use with various types of bulk materials with a dielectric constant above 1,8. During the measurement, high-frequency microwave pulses are coupled onto the probe and guided along with the probe to the bulk goods. The product surface partly reflects these pulses back to the sensor, where the actual filling level is calculated.

The MOLOSwave sensor reliably and accurately measures the actual filling level in silos and tanks with a measuring range of up to 20 m. Output signal: 4..20 mA provides easy further signal processing by routing it to the PLC or visualizing it in a local display device.


  • 4-wire technology: Supply voltage: 12… 30 VDC; Output signal: 4… 20 mA / 0… 100%
  • Digital output: 1x DC PNP, NC or NO selectable
  • Measuring range MWF 21 with rod probe up to 3 m
  • Measuring range MWF 27 with cable probe up to 20 m
  • Process temperature: -20 ° C… + 150 ° C
  • Process pressure: -1 bar… 40 bar
  • Possible use in dust explosion hazardous areas with ATEX zone 20/21


2. Mollet MOLOSbob Yo-Yo type sensor for continuous level measurement

Mollet Yo-Yo type sensor MOLOSbob LF20 can be used for reliable continuous level measurement of bulk tanks up to 42 m high. The measurement technology is not affected by parameters such as dust, moisture, conductivity or grain size. During the measurement at a specified time interval sensing weight is driven down into the silo or hopper with a steel band. As soon as the weight touches the surface it is stopped and the actual filling level is measured.


  • Supply voltage: 90… 253 VAC, 50/60 Hz or 20… 28 VDC
  • Output signal: 4… 20 mA / 0… 100% and 2 or 4 freely programmable relay outputs
  • Measuring range - band length 15, 32, 42 m
  • High measurement accuracy: ± 2.5 cm
  • Process temperature: -20 ° C… + 150 ° C (up to 350 ° C on request)
  • Possible use in dust explosion hazardous areas, category 1 / 2D


If you need Mollet level sensors, contact ZTF Lāsma specialists who will help you find the most suitable and cost-effective solution. We are here to support you!


Code: MWF27A1B0C65E0G1ALS050
Ask for availability
931.00 EUR (w/o VAT)
Juris Vuškāns
Juris Vuškāns
Product manager
+371 2411 0541

MOLOSbob level measurement

MOLOSwave level measurement