FMSS Cable Suspension System

Loss-in-weight feeders rely on exceptionally high measurement resolution and frequent load sampling for accurate rate measurement and control. Thayer Scale’s unique technologies mitigate the known mechanical factors, such as foundation distortion and tight process connections, that contribute to inaccurate weight measurement and poor measurement repeatability in loss-in-weight feeders. Thayer Scale’s proprietary FMSS cable suspension system is an arrangement of active, maintenance-free mechanical elements interposed between the weigh hopper and a single load cell. This system functions as a force vector filter, blocking all nuisance, erroneous, and destructive (shock and impact) force vectors.

Benefits of Thayer Scale’s FMSS cable suspension system include:

  • Field-adjustable, mechanical tare-balancing of dead loads to produce a high signal-to-noise ratio
  • Immunity to support-structure deflections and process vibration
  • An easily-accessible load cell for inspection and removal
  • Pneumatically-operated automated test weight lift and storage mechanism to simplify the application of test weights
  • Measurement not affected by off-center or overhung loads (i.e., long discharge augers)
  • Feeders that may be moved frequently without damage or the need for re-calibration
  • Inherent self-alignment to gravity
  • No susceptibility to shock and impact loads
  • 1000 percent mechanical overload protection
  • Fifteen-year unconditional load cell warranty (LVDT-based model LC-137 load cell only)

Scale Design Principles

The sum of the torques generated by each pair of corner cables is proportional to scale-loading.

Torque A is added to Torque B via Torque Tube #1.

The sum of Torques A and B is added to Torque C via the torque-transfer cable and equalizing levers.

The sum of Torques A, B, and C are added to Torque D via Torque Tube #2.

The weight on the load sensor extension lever opposes the tare-portion of the summed torques.

The remaining torque value is proportional to net loading, and is opposed by the load sensor.