Load Cell Calibration Example

Load cell and hx711 introduction.

Load cell calibration example.

This example illustrates the construction of a linear regression model for load cell data that relates a known load applied to a load cell to the deflection of the cell. How to calibrate load cells when it comes to industrial scales one of the most important components is proper calibration. In example 1 we have a 10 000 lbf load cell with an output of 4 11235 mv v and the force measuring device is read at the fifth decimal 0 00001 and the display counts by 1 example 1. They are many types of load cell but today we will be using the straight bar type.

Record of the load cell calibration. The load cells calibration procedure involves incremental loading and the evaluation at each step of the output signals of both the calibrated weighbridge and of the master load cell figure 8 4. The load cell must also be accurately wired to the hx711 to ensure that the appropriate strain gauge leads are used to approximate the weight given by the load cell. Device reads in mv v counts by 1.

The model is then used to calibrate future cell readings associated with loads of unknown magnitude. 4 2 verify that the master load cell s to be used for load cell calibration comply with test specification. The number of divisions used and the method of applying the force hydraulic or servomotor is up to the user. Procedure for load cell calibration at elsa reaction wall 2 2 introduction this report is intended to explain the basic concepts involved in the procedure currently used for internal calibration of load cells at the reaction wall facility of the european laboratory for structural assessment elsa.

So what is a load cell. The hx711 is easily wired to the arduino using any two digital or analog pins. The load cells calibration procedure involves incremental loading and the evaluation at each step of the output signals of both the calibrated weighbridge and of the master load cell figure 8 4. 4 2 1 select the most appropriate master load cell or combination of master load cells for calibration of the load cell over the desired range of forces.

Unfortunately the process to calibrate most scales is arduous and complicated which can spell significant revenue loss for growing companies. For example in the case of a 60 tonne load cell then specific test weights that measure in 5 10 20 40 and 60 tonne increments may be used a five step calibration process is usually sufficient for ensuring a device is accurately calibrated.