LWF-SC-V Loss-In-Weight Vibratory Feeder

THAYER Model No.
Approximate Feed Rate Range lbs/hr (@ 50 lb/ft³)
10 – 4,000
Scale Capacity (pounds)
30 – 500
Scale Suspension Type
Weigh Hopper Liquid Capacity (ft³)
4.0 – 20
Available PAN Widths (in)
4.0 – 12.0
Load Cell Type
Strain Gauge / LVDT
Typical Materials Handled


Model LWF-SC-V Loss-In-Weight Feeder

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

Specialized Material Conditioning System

The LWF-SC-V when fitted with Thayer’s (optional) patented Spiralator™ vertical lift agitator creates a patented feeder system that assures conditioned and uniform flow of caking and cohesive powders as well as interlocking particles and delicate flakes.

Two feed tray designs available:

  • (Standard) mirror finish steel tray is used for non-adhesive powders, pellets, granules, fibers and flakes.
  • (Optional) patented elastomer membrane insert fitted to our vibrating tray for materials that tend to adhere and build up on conveying surface.


Thayer Scale’s built in Automatic Test Weight Lifter (“ATWL”) provides a means for automatically applying a known test load and going through a calibration sequence on computer or push-button demand to check scale calibration. A “foolproof” self checking software algorithm in the feeder control instrumentation prevents erroneous calibration.

The test weight calibration method has proven accurate and reliable over decades of in-plant use. Unlike material sampling, it is always clean, fast and safe. Unlike electronic signal simulation, it actually tests the performance of critical electro-mechanical components under the full deflection range of the load cell.

  • Accurately measures load regardless of load position
  • Immune to support structure deflections and process vibrations
  • Inherently self aligning to gravity
  • Nulls out heavy tare loads
  • 1,000% over load capacity
  • Scale may be suspended from above or supported below
  • Immune to shock or impact loads
  • Easily accessible load cell can be accessed without removing the feeder

Patented “FMSS” (Force Measurement Suspension System) Cable Scale Technology

The THAYER Cable Scale is the most rugged and forgiving Load Cell Weighing System available on the market. It can take more physical abuse and can tolerate more foundation distortion/deflection than all other known designs. Feeder “dead load” is mass-counterbalanced so that only material weight (live load) is measured. This unique feature helps assure excellent control in “noisy” environments.

All of the articulate parts of the scale mechanism are supported from “axially inextensible, but laterally yieldable” suspension elements (stainless steel pre-stressed aircraft cable), which are arranged to hang freely, thereby avoiding any appreciable spring or hysteresis effects, variations in mechanical advantage, or binding due to imperfect leveling.

Because of this unique mechanical property of the force transmission system, any laterally directed forces and shocks on the scale or its supported machinery can not cause destructive shear and bending stresses to develop in the elements themselves or at the load cell junction. The system, being yieldable in the lateral direction, is therefore effectively and completely protected by using laterally placed “stops” in proximity of the weighed structure.

Weight loss measurement is done by either Thayer’s LC-137 LVDT Load Cell or NTEP approved strain gauge load cell depending on application requirements.