The distinct specification of continuous belt scale weighing applications and the unique environment and operational issues those applications typically encounter, places tooLoad Cell capacity chart 2 many requirements on the load sensing system for any single technology to completely satisfy. Therefore, using THAYER’S exclusive FMSS technology in the design of its belt scale suspension system allows the choice of using either its LC‐137 LVDT Load Cell or its LC‐174 Strain Gauge Load cell. This puts THAYER in a unique position that allows us to offer equipment to match a wide range of applications such as light material loading, severe environmental conditions, and commercial certification.
Load Cell Utilization Factor
The performance of a load cell and its instrumentation is specified on the basis of the load cell’s rated output. If the load cell is supporting a quantity of dead‐weight (i.e. idlers, belting, suspension system) and has been further oversized to accommodate problems of overload protection, off‐center conveying, shock, vibration and negative integration, then the amount of range left to do the job of weighing is only a fraction of the cell’s rated output. The percentage of the load cell’s rated output reserved for the actual job of weighing material is called the Load Cell Utilization Factor.
FMSS Force Measurement Suspension System
THAYER’S “RF” Belt Scales with “FMSS” Force Measurement Suspension System mass counter balance technology assures better than 80% Load Cell Utilization.
- Field adjustable mechanical TARE balancing of dead loads typically as high as 200 times NET loads, thereby providing the full utilization of the load cell force range.
- Reduces deflection of load receptor to a fraction of load cell deflection.
- Reduces zero shifting as a result of foundation distortion.
- Provides preferred access location of load cell for inspection or removal.
- Simplifies the application of test weights for calibration/performance verification.
- Provides for lower signal velocity and acceleration under dynamic conditions.
Two Types Load Cells to Choose From
The LC-137 (LVDT) Load Cell
was specifically developed as the ideal adjunct to THAYER’S “reverse-action” Force Measurement Suspension System. It is essentially a precision and extremely durable “tension-style” force transducer that is manufactured in a fine series of force ranges from 5 to 465 lbs. The LC-137 is the ideal load cell for “light loading” applications where mechanical tare loads represent as much as 10 to 40 times the net material load and provide unparalleled at 200% of rated output. So superior is the LC-137 Load Cell that it is guaranteed for 15 years.
The LC-174 Load Cell
is a conventional NTEP approved Strain Gauge “S” Beam Load Cell that is housed in an enclosure that has identical mounting dimensions to that of the LC-137. Available in force ranges from 25 to 2,000 lbs with an overload protection of 1.5% of rated output.