Loss-In-Weight

  • PENKO Engineering B.V. has developed a range of solutions and products to calculate and control the accurate mass flow from all types of containers by means of the loss-in-weight technique, including the refill procedure.

    The unique way of measuring high speed and high resolution, immediately detects any changes in the actual flow of mass.  These instruments control negative dosing, regulate mass flows and totalize the dosed mass. For this purpose the loss in weight (Δm) is checked and, when required, the related time (Δt) is determined. In the latter case a simple calculation, Δm : Δt, presents the mass flow. 

    During the process, the instruments offer a wealth of information including:

    • weighers contents
    • loss in weight
    • dosed mass
    • mass flow

    In addition to providing this data, the instrument allow for the controlling of weigher refill functions, switching of dosing devices and regulating of mass flow.   

    The speed of the dosing device can be readjusted by continuously comparing the current mass flow with the pre-set mass flow. During refilling, so when no loss in weight can be observed, the speed of the dosing device is regulated in several, empirically established steps, depending of the weighers contents.  

    Operating Process  

    Typically, a PENKO weighing controller is programmed with a set value for the mass flow and adjusts the speed of the output feeder in proportion to the amount of the product. A module recalculates the hoppers output speed and compares the pre-set mass flow with the actual mass flow. Whilst the hopper slowly empties, the loss of weight or actual mass flow per unit of time is calculated by the controller which subsequently adjusts the speed of the output feeder when necessary. This sequence compensates differences in material flow characteristics due to the volume of material in the hopper, or changes in material density.

    Loss-in-weight systems are often used for blenders where an additive is continuously fed into the mix. A typical configuration comprises of a weigher with a regulated outlet. This can be a screw with variable speed, or a proportional valve. The sequence starts with the weigher being filled. A recipe value is set for the gross weight and a second value is set for the pre-set flow rate.

    Products:

    • FLEX LIW Controller
    • FLEX2100 LIW Controller
    • Platforms 
    • Load cells

     

    Applications:

    • dosing of additives
    • production of not mixable compositions, such as salads and nuts
    • in line dosing of liquids

  • Product Name

    PENKO FLEX RANGE

    This all-in-one controller IS available as MFL (Mono-Filler) CHK (Check Weigher), BLT (Belt Weigher) and LIW (Loss-in-Weight) for filling processes is suitable for trade (certified); in addition to 8 inputs it has 4 integrated set points which can be used for example for product supply. 

    • optional various in/output cards, including analogues
    • user friendly touch panel
    • panel instrument
    • outputs RS232, RS422/485
    • communication portals Ethernet, USB and CANbus, optional: Profibus-DP
    • conversion speed 1600s/s
    • maximum 4 load cells
    • optional in combination with shunt diode barriers’ (EEx-ia)  for hazardous areas
    • active sense

    Get Specifications

    Get Manual

    Get Loss-in-Weight Supplement


    Product Name

    PENKO FLEX2100 RANGE

    This high value controller IS available as MFL (Mono-Filler) CHK (Check Weigher), BLT (Belt Weigher) and LIW (Loss-in-Weight). 

    • 8 inputs
    • user friendly touch panel
    • optional analogue output regulates flow control
    • offered as a panel instrument or in industrial (IP65) stainless steel housing
    • outputs RS232, RS422/485
    • communication portals Ethernet, USB and CANbus, optional: Profibus-DP
    • conversion speed 1600s/s
    • maximum 8 load cells
    • passive sense

    Get Specifications

    Get Manual

    Get Loss-in-Weight Supplement