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A sensing weight is driven down into the silo or hopper with a steel band. As soon as the weight touches the surface, the tensile force on the tape decreases. This reduced tensile force is detected by the electronic of the MOLOSbob LF20 and the lowering of the weight is stopped immediately. After this a 4-20 mA current output signal is given proportional to the measured distance and the sensing weight returns to the end position whereby the measured value determined is retained until the next measurement cycle starts. Different sensing weights enable exact level measurements independent of density or grain size of the bulk material. This signal can be visualized with easy to use and well legible indicating units that are mounted in a switch cabinet.


Product features

  • Reliable continuous level measurement up to a silo height of 42 m
  • Measurement technology unaffected from characteristics like dust, moisture, conductivity or grain size of the bulk material
  • Measurement in silos with a process temperatures up to 150 °C possible
  • No influence on the measurement process by internals in silos or vessels
  • High measurement accuracy of the actual filling level of ±2.5 cm
  • A four-line plain text display enables an easy menu-guided commissioning and local operation
  • Use in dust incendive hazard areas possible, category 1/2D
  • 4 - 20 mA current output and maximum 4 freely programmable signal outputs
  • Protection type IP 67 according EN 60529
  • Compact and still robust design with low weight
  • Special designed tape wiper avoids pollution of internal housing
  • No movement into silo outlet due to fully electronic digital minimum fail-safe mode


Further information on ATEX

Housing / Lid
Aluminum coated RAL 7001 / pure
Tape run-off speed
0,16 … 0,25 m/s
Traction power
150 N
Angle of inclination
maximum 2°
Power supply
90 … 253 VAC, 50/60 Hz
20 … 28 VDC
11,5 kg including sensing weight
300 x 260 x 225 [HxBxD]
Process connection
Flange DN100 PN16 / 4" Aluminium
Aluminum / steel or Stainless Steel (304)
Measurement tape
Stainless Steel (301, modified)
Measurement range
0 m … 42 m
Power consumption
max. 150 VA w/o heater
max. 170 VA with heater
Process pressure
-0,5 … +1,0 bar
Process temperature
-20 °C … +150 °C
Ambient temperature
-40 °C … +60 °C
Explosion approvals
ATEX II 1/2D Ex ta/tb IIIC T99°C Da/Db
maximum 2,5 mm²
Input voltage 30 VDC
Contact load maximum 0,3 W
Current output 4 … 20 mA
Relay outputs maximum 250 VAC / 6A
Optocoupler output max. 30 VDC / 10 mA
Type of protection
IP67 according EN 60529
Technical data


Reliable continuous level measurement in silos, vessels and hoppers filled with dusty, powdery, granulated and grained bulk materials any kind like gravel, sand, cement, concrete, lime, gypsum, broken stones, animal feed, fishmeal, milk powder, grain, spices, salt, sugar, flour, coffee, cacao, cereals, graphite, fertilizer, zinc sulfate, aluminum oxide, polystyrene, plastic granulate, plastic powder, filler, wood pellets, wood chips, sawdust, foam flakes, ash, fly-ash, slag, carbon black, coal, coke dust and many others more.


Interface measurement and level measurement of liquids are possible as well.


Typical applications are: