how to connect a load cell

A load cell is an essential component of many industrial and laboratory applications. It is a device that converts mechanical force into electrical signals. Accurate measurement in these applications is crucial, and that's why proper connection of the load cell is necessary. This article will explore the steps involved in connecting a load cell to a measuring instrument.

Choosing the Right Load Cell

Before connecting the load cell, ensure that you choose the correct type that matches your application. There are different types of load cells, with varying sensitivities and capacities. For example, if you're measuring an industrial crane's weight, a large capacity load cell is necessary. Conversely, if you're measuring the weight of small laboratory samples, a smaller capacity is ideal. Ensure that you select a load cell that has the right specifications for your application to obtain accurate results.

Connecting the Load Cell

To connect the load cell, you'll need a few materials that include a dedicated load cell amplifier, a wheatstone bridge sensor, and connecting cables. The wheatstone bridge sensor enables the load cell to measure the force applied to it. Connect the positive output of the load cell to one wheatstone bridge input and the negative output to the other input. Connect the excitation voltage to one input and the ground to the other input. Ensure that the pins match up on the connectors.

Wiring the Amplifier

The amplifier is crucial in amplifying the electrical signals generated from the load cell. Take the output from the wheatstone bridge and connect it to the negative input on the amplifier. Next, connect the positive output from the wheatstone bridge to the positive input on the amplifier. Ensure that you connect the appropriate pins on the connectors. Connect the amplifier power supply to the specific power input. You can now connect the amplifier output to your display device.

Calibration and Testing

Once the load cell is connected, it's essential to calibrate it before use. Calibration involves setting up the device to eliminate any external factors that might affect the load cell's accuracy. Proceed to test your load cell with a known weight. Record the readings and compare them to the known weight. If there's a discrepancy, you'll need to adjust the load cell sensitivity accordingly.

Conclusion

Connecting a load cell may seem daunting at first, but it's a manageable process. It's important to choose the appropriate load cell, wire the connections correctly, and calibrate the device for accurate results. After calibration, test the device to ensure that it provides the expected output. With these steps, you'll be able to connect a load cell easily and use it effectively in your applications.