Model LWF-8-V Flexure Scale Loss-In-Weight Vibratory Feeder

Spiralator Vertical Lift
Hopper Agitator
Patented tray insert creates a multiple node, standing (vibrating) wave which acts to shed any material that has a tendency to adhere to the conveying surface.
Nodal Membrane Feeder
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Spiralator Vertical Lift Hopper Agitator creates a patented feeder system that assures conditioned and uniform flow of caking and cohesive powders as well as interlocking and delicate flakes.

Quick Release Vibratory
Feeder Tray

Volumetric Capacity: 60 Ft³/Hr.
Density Range: 10 to 100 Ft³ (160 to 1,600 Kg/M³).
Vibrating Feeder Drive: Electromagnetic Drive.
-4 (104 mm) wide tray, 115 VAC, up to 40 ft³/hr.
-5 (127mm wide tray, 115 VAC, up to 60 ft³/hr (Nodal-Membrane Tray).
Scale Type: "FMSS" Model 8 Flexure Scale System (dead load is masscounterbalanced) and LVDT Weight Sensor.
Scale Capacity (live load): variable 1 to 25 lbs (0.45 to 22 kg).
Hopper Capacity: 0.5 ft³ (0.014 m³) liquid.
Accuracy: 0.25% to 1% of set rate ±2 sigma based on thirty 1 minute samples or 1.0% of weigh hopper storage capacity, whichever is greater.

The LWF-8-V Loss-In-Weight Feeder is designed to assure uniform, non-pulsating accurate feeding of a wide range of materials, from free flowing to friable to cohesive.

Ideal for feeding materials at very low feed rates accurately, with second to second uniformity, and without feed rate pulsation.

Simple, low cost design makes it an excellent choice for feeding free flowing materials such as pellets or granules.

Widely recognized as the most suitable choice for feeding delicate materials such as fiberglass and other reinforcing materials. Specialized scale design assures reliable, accurate metering.

The heart of any gravimetric feeder is its scale system. The LWF-8-V incorporates a unique flexure suspension scale configured exclusively for Loss-In-Weight Feeding:

High efficiency dead load counterbalancing
Non-tilting platform design
Tolerant of shocks and overloads
Mechanical force summing to a single load sensor
Full range sensor utilization = maximum resolution
Low mechanical resonance frequency
Easily adapted to future re-rates

This THAYER Flexure suspension eliminates all wearing parts, such as bearings, pivots and knife edges, and is not susceptible to damage or loss of calibration from overloading. The system transfers all loading forces to a single load transducer, accurately measuring load regardless of load position. The ability of the system to cancel all extraneous force vectors and mass counterbalance the entire dead load enables the selection of the best possible load transducer for the application, thereby optimizing the overall sensitivity of the control system.