Choosing the right components is extremely important if you want to ensure that your weighing system is providing an accurate output. However, there are several external factors and forces that affect the precision of your weighing system. Learning about them is crucial to guarantee accurate results.
Here are three common factors that can have an impact on a weighing system’s accuracy:
The manufacturer specifies a maximum load that each load cell can sustain in the weighing system. If the instructions are not followed properly and load is distributed improperly, it will put strain on the strain gauges and send a signal change that is proportional to the twister instead of the load’s weight.
For instance, rigidly mounted piping on a weight vessel will support part of the load, but it will not transmit the total load to the load cells. To prevent this, the load cells should be able to support the entire weight that is to be measured. Also, make sure that bumper or check rods aren’t supporting the load to ensure the accuracy of the final output.
Load cell accuracy
It’s critical to select a high-quality load cell for the system to ensure accuracy. This is a piece of machined metal that converts mechanical force into an electrical signal when mechanical force is applied. The strain gauges measure the bend exerted on it when force is applied, which provides a proportional electrical signal.
The output generated by the load cell can also be influenced by changes in temperatures. Unless the device is calibrated for each temperature change, the sensitivity of the load cell will be different, affecting the outcome. Particularly, if the load cell is at zero loads, the temperature effect will cause the entire output range to shift.
Interference with electrical signal transmission
It’s imperative to make sure that the weight controller measures only the electrical signal of the load cell as external factors can interfere with the readings. For instance, electric noises such as electromechanical interference (EMI) and radio frequency interference (RFI) affect the weighing accuracy of the system.
Similarly, if the weighing system has moisture content present in the junction box, it can reduce the capacitance between single lines. As a consequence, the load cell excitation lines will couple to the signal lines, which will generate electrical noise that will impact the accuracy of the weighing system.
Looking for high-quality load cells and weighing systems? Get in touch with Contact Instruments! We’re Canada’s leading OEM drilling instrumentation manufacturer that offers quality instrumentation solutions, including weight indicator systems, oil rig instrumentation, and many more. For further information, call us at 780-955-8998 or visit our website.