Belt Weigher Load Cell

Function

The load cell signal, combined with the belt speed signal from the tachometer, allows the plant PLC to calculate instantaneous feed rate in TPH and totalized tonnage. An inaccurate or drifting load cell introduces systematic feed-rate error that corrupts the aggregate grading without triggering any obvious visual alarm — making it a hidden quality risk on live projects. Cell degradation caused by overload events, vibration fatigue, moisture ingress, or cable damage should be confirmed by annual verification against a calibrated standard, with replacement at any drift greater than 0.3% full scale.

Construction & quality

Shear-beam stainless steel body (17-4PH or equivalent), fully welded and hermetically sealed. Strain gauge: precision foil gauge, 350 Ω, full Wheatstone bridge, temperature-compensated from −20 °C to +70 °C with thermal drift less than 0.02% FS/°C. Output sensitivity: 2 mV/V ±0.1%. Cable: 4-core shielded, PUR outer jacket rated for outdoor UV exposure, 5 m standard (extended lengths available). Connector: stainless Amphenol or terminal-strip flying leads. Mating surface: ground to flatness ±0.01 mm on mounting faces.

When to replace

• Totalized tonnage reading drifting versus truck ticket weights by more than 0.5%
• Zero-return drift greater than 0.2% FS after load removal in ambient conditions
• Calibration verification check failing at any standard test point
• Cable jacket cracking, abrasion damage, or moisture at the connector
• Load cell body visibly deformed or showing evidence of impact damage or overload