SI Insertion Weigh Belt

THAYER Model No.
Belt Width (inches)
18″, 20″, 24″, 30″
Approx. Flow Rate Range
0.5 – 35
Material Density Range (lbs/ft³)
0.5 – 80
Maximum Material Particle Size (Inches)
Scale Loading (lbs/ft)
Consult Factory
Load Cell Type
Strain Gauge / LVDT
Typical Materials Handled


SI Insertion Weigh Belt

Thayer Scale’s Weigh Belt Feeder Series “SI” Insertion Weigh Belt Feeder is a unique feeder that has been designed to easily fit into an existing production process.

The “SI” comes in either scale over or scale under design. A short support framework and a V-Guided conveyor (12, 18, 24 and 36 wide) makes this the only practical weighing module for insertion into a transition space between existing conveyors or equipment.


Unique benefits result from suspending the conveyor from the THAYER Force Measurement Suspension System. Since load measurements are not affected by the physical characteristics of the belting and its supporting means (stiffness, sliding friction, non-uniformity, splice effects tension/misalignment interaction, etc.) the construction of the belting and its material can be chosen on the basis of durability and belt tracking ability without concern for loss of accuracy. Also, on new installations, the combination of the most suitable volumetric pre-feeder and the Series SI often proves the best approach considering cost, allocatable space, and material handling requirements.

The conveyor portion is normally 24″ or 36″ long and is suspended from the scale on an open cantilevered C-Frame pipe support, which greatly simplifies belt removal and replacement for wash down applications. Belt widths of 12, 18, 24, and 36 are available. Because the belting is more robust than that used for under-the-belt load sensing feeders, and because the belt is positively tracked using a V-Guided tracking system, the operating life of the belt is substantially longer than with conventional designs. The conveyor portion can be oriented on the C-Frame to convey horizontally, upwards (20 degrees) or downward (20 degrees), in whatever configuration best suits the installation conditions. The combination of gear reducer/motor is supplied for wash down service, and is available in either constant or variable speed applications.

The SI Insertion Weigher uses Thayer Scales patented precision flexure plate suspension scale with FMSS technology. The scale provides for complete mass counterbalancing of the dead load of the conveyor permitting the load sensor to react only to the net material load. This unique system is not affected by dirt, shocks or vibration, and can withstand overloads in access of 1,000 pounds without causing damage or affecting calibration. The highly advanced and extremely robust sensing technology is based on either an LVDT or strain gauge load cell.

The Series SI can be supplied with THAYER instrumentation and controls to function as either a process stream weigher only, or as a flow stream controller/weigher (providing the additional controller output to regulate the upstream delivery system. Thayer’s patented SLC (scale location compensation) features can also be supplied to move the point of measurement further downstream adjacent to associated or slaved equipment.

Thayer Scale Model SI Weigh Belt Handling Spinach

SI Insertion Weigh Belt
SI Insertion Weigh Belt
SI Insertion Weigh Belt equipment