A load cell is a transducer that converts mechanical force, weight, or tension into a proportional electrical signal (typically using a Wheatstone bridge circuit with strain gauges).
| • Rated Capacity | The maximum weight or force the sensor is designed to measure accurately (e.g., common micro/bench sizes like 5kg, industrial sizes like 50kg, up to tons). |
| • Rated Output (Sensitivity) | The electrical signal output per volt of excitation at full capacity, usually expressed in millivolts per volt (mV/V, commonly 1.0 mV/V to 3.0 mV/V). |
| • Excitation Voltage | The recommended or maximum voltage (AC or DC) required to power the internal strain gauge bridge (typically 5V to 10V DC, up to 15V–20V max). |
| • Input / Output Resistance | The electrical resistance of the bridge circuit measured across excitation terminals (Input, e.g., ~1000Ω to 1130Ω) and signal terminals (Output, e.g., ~1000Ω). |
| • Accuracy & Combined Error | The deviation from the true weight value, encompassing non-linearity, hysteresis, and non-repeatability (often rated around ±0.02% to ±0.1% of full scale). |
| • Zero Balance | The output signal when no load is applied, expressed as a small percentage or millivolt offset of the rated output (e.g., ±0.1mV). |
| • Overload Rating | |
| • Safe Overload | The maximum load it can endure without permanently altering performance (typically 150% of rated capacity). |
| • Ultimate Overload | The point of mechanical structural failure or damage (often 300% or higher). |
| • Operating Temperature Range | The thermal limits within which the sensor maintains its specified calibration (e.g., -20°C to +65°C), alongside temperature effects on zero and span |