1) Adjustable mechanical tare balancing of dead loads (typically as high as 200 times net loads) to maximize measurement signal
- Reduces signal transmission problems
- Enhances zero temperature stability
- Reduces susceptibility to moisture migration
- Lessens dependency on high-quality terminal connections
- Sums all load forces to one load cell, simplifying troubleshooting and reducing costs
2) Significantly-reduced load receptor deflection
- Desensitizes belt tension effects (conveyer belts and weigh scales)
- Desensitizes inlet/outlet flexible connections and weigh loops wiring (loss-in-weight feeders)
3) Reduced zero-shifting as a result of foundation distortion
- Substantial zero-shifts can occur if a structure’s supporting frame yields under load or settles over time. Loss-in-weight feeders and belt scales mounted to conveyor stringers are particularly sensitive to foundation distortion.
4) Accessibility for load cell inspection or removal
- Leaves load cell undisturbed during inspections
- Expedites realignment and removal, reducing downtime
5) Simplified test weight application for calibration
- Provides remote tracking and reporting of weight storage and application
- A test weight calibration is always part of the FMSS system. (A resistor calibration is never used on Thayer scales.)
6) Lower signal velocity and acceleration under dynamic conditions
- Enables accurate conveyer weighing at speeds in excess of 1,000 feet per minute on conveyor belt scales
Load Cell Utilization Factor
The performance of a load cell and its associated instrumentation is determined by the load cell’s rated output. The load cell utilization factor is the percentage of a load cell’s rated output that is available for actually weighing material. If the load cell is supporting dead weight (i.e., hopper, screw feeder) the output left to weigh material is only a fraction of the load cell’s total rated output. The limited availability of conventional load cell capabilities further diminishes a load cell’s performance.
As a result, the load cell utilization factor can often fall to as low as 20 percent, resulting in drift, non-repeatability, and temperature-induced weight shifts that can be as much as five times the value specified by the load cell supplier.