A load cell is a force sensing module – a carefully designed metal structure, with small elements called strain gauges mounted in precise locations on the structure. Load cells are designed to measure a specific force, and ignore other forces being applied. The electrical signal output by the load cell is very small and requires specialized amplification. Fortunately, the 1046 PhidgetBridge will perform all the amplification and measurement of the electrical output.
Load cells are designed to measure force in one direction. They will often measure force in other directions, but the sensor sensitivity will be different, since parts of the load cell operating under compression are now in tension, and vice versa.
This Single Point Load Cell is used in small jewelry scales and kitchen scales. It’s mounted by bolting down the end of the load cell where the wires are attached, and applying force on the other end in the direction of the arrow. Where the force is applied is not critical, as this load cell measures a shearing effect on the beam, not the bending of the beam. If you mount a small platform on the load cell, as would be done in a small scale, this load cell provides accurate readings regardless of the position of the load on the platform.
Sensor Properties
| Sensor Type | Shear Load Cell |
| Weight Capacity Max | 20 kg |
| Maximum Overload | 24 kg |
| Creep | 20 g/hr |
| Zero Balance | ± 300 g |
| Cell Repeatability Error Max | ± 10 g |
| Cell Non-Linearity Max | 10 g |
| Cell Hysteresis Max | 10 g |
| Temperature Effect on Span | 1 g/°C |
| Temperature Effect on Zero | 2 g/°C |
Electrical Properties
| Rated Output | 1 mV/V |
| Rated Output Error Max | ± 150 ?V/V |
| Output Impedance | 1 k? |
| Supply Voltage Max | 5 V DC |
Physical Properties
| Compensated Temperature Min | -10 °C |
| Compensated Temperature Max | 40 °C |
| Operating Temperature Min | -20 °C |
| Operating Temperature Max | 55 °C |
| Cable Length | 550 mm |
| Cable Gauge | 30 AWG |
| Material | Aluminium Alloy (LY12CZ) |
| Screw Thread Size | M5x0.8 |
The Data Sheet below has a comprehensive glossary that describes in practical terms the meaning and usefulness of the specifications.
