LWF-SG-TS Twin Screw Loss-In-Weight Feeder

THAYER Model No.
Approximate Feed Rate Range (ft³ hr)
0.005 – 2.0
Scale Capacity (pounds)
3.0 – 50
Scale Suspension Type
Weigh Hopper Liquid Capacity (ft³)
0.1 – 0.5
Available Screws Diameter (in)
0.2 – 0.75 Twin Screw
Load Cell Type
Strain Gauge
Typical Materials Handled


LWF-SG-TS Twin Screw Loss-In-Weight Feeder

Thayer Scale Loss-In-Weight Feeders are designed to provide precision class accuracy and repeat-ability even in the harshest of industrial environments. They range in capacity from grams per minute to tons per hour.

These are the most versatile feeders in the industry. At the heart of each Loss-In-Weight Feeder is a THAYER scale that has been designed exclusively for the stringent requirements of Loss-In-Weight feeding.

Thayer Scale offers a powerful set of proprietary add-on accessories that are designed to defeat the problematic flow issues encountered by industry such as bridging, flushing, adhesion and cohesion. Comprehensive process solutions that can only come from a company with over sixty years of experience.

LWF-SG-TS Twin Screw Loss-In-Weight Feeder

Thayer Scale’s Model LWF-SG-TS Twin Screw Loss-In-Weight Feeder is designed to reliably and accurately meter cohesive, easily aerated and difficult to control powders.

Deep Tear-Drop “U” trough screw feeder with horizontal agitator that moves material away from both front and back walls of the conditioning chamber above. The deepness of the trough assures that the screw is completely submerged in “quiet” material, free of the usual surface disturbances arising from the turning agitator above. This, along with an inherently larger trough “wrap-around” angle, provides for complete and efficient filling of each individual flight. This helps to maintain a more uniform material density throughout. Another advantage of the deep-trough design is that it is less susceptible to transient overfeeding that accompanies hopper refilling.

Fast and easy to clean

The LWF-SG10-TS is designed for fast, easy and thorough clean out. Feeder completely disassembles in less than one minute. High quality, rugged, stainless steel construction assures years of reliable, trouble free operation even in the most severe industrial environments.

Weight Measurement System

The heart of any gravimetric feeder is its scale system. The LWF-SG10-TS incorporates a unique flexure suspension scale designed exclusively for use on Loss-In-Weight Feeders:

  • 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 = maximized resolution
  • Low mechanical resonance frequency

Flexure plate system eliminates all wearing parts, such as bearings, pivots and knife edges and is not susceptible to vibration. Flexure suspension system transfers all loading forces to a single load transducer, which accurately measures load regardless of load position. Most platform scales are not designed to be immune to side loading and/or tortional loading caused by the plant environment and by the movement of the feed screw, agitator, etc. These factors can cause poor accuracy and poor calibration stability. Thayer’s flexure system cancels all horizontal force vectors and also allows heavy tare loads (weight of feeder and hopper) to be completely mass counterbalanced , permitting load cell sizing based on net rather than gross weight.

  • 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