SAS (Smart Apron Scale)


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Function :

An electro-mechanical weighbridge with two digital SFT (Smart Force Transducer) load cells is inserted into the apron conveyor for the accurate flowrate measurement.

No weighbridge misalignment error thanks to virtually deflection free measurement by the SFT

Smooth, vibration free weight acquisition thanks to uncut rails in the weighing area. This eliminates the weighing errors with traditional scales caused by the rollers passage over the rail cut.

The conveyor speed is measured by an incremental encoder mounted on the drive shaft.


  • Weighing
  • Flow rate calculation
  • Totalization
  • Dosing of materials conveyed on an apron conveyor

Customer benefits

  • Accuracy ± 1%
  • Two 100% digital SFTTM loadcells with high resolution (1 : 1’000’000)
  • Essential information for determination of the clinker production
  • Universal design for all apron conveyor types
  • High performances


  • Design is individually adapted for the existing apron conveyor
  • For steel plate or deep drawn bucket conveyors
  • Installation in horizontal (preferred) or inclined part
  • Optional hot temperature design for up to 150°C



The Smart Apron Scale (SAS) is an apron conveyor belt scale. It allows to check the real production of the kiln and to determinite the ratio between rawmeal, clinker and combustibles.


  • Standard rail size S20 compatible S18
  • Special rail size on request


The Smart Apron Scale is connected to a BFC electronic controller – panel or wall version.


  • 3 Configurable isolated digital outputs with programable thresholds: totalizer, alarm, horn
  • 1 Configurable isolated 0/4-20 mA analog output for either: flowrate, current weight, speed, load per meter
  • 2 Configurable isolated digital inputs: out of range acknowledgement, totalizer reset.

In option

Isolated serial communication :

  • Modbus, Ethernet ModbusTCP, Profibus DP - for connection with a PLC or host computer.


Technical data

Accuracy±1% up to 25° inclination, ≥1% up to 45°
Protection classIP65
Load cellsTwo 100 % digital SFT
Rails Type DIN 5901/02 SS20(S18 compatible, other size on request)
Distance between rails600 - 2.000 mm
Distance between rollers600 - 1.500 mm
Space requiredHorizontal lenght ≥ 5.000 mm
Total load per axlemax. 1000 kg
Conveyor SpeedAll ranges
Speed sensorDigital encoder
Corrosion protectionPrimer, Finish coat
ColorRAL 5000 beu

Download technical sheet