When choosing a weighing load cell, we must first consider the actual working environment. The working environment can affect whether the sensor can work normally, the service life of the sensor, and even the reliability and safety of the entire machine. So what are the errors that the load cell will produce?
(1) Characteristic error
This error is mainly caused by the DC drift value of the device itself, the incorrect slope of the slope or the nonlinearity of the slope. We should often hear the phrase "there is a big gap between ideal and reality", and the load cell is also Similarly, there is a certain gap between the ideal transfer function characteristics of the load cell for weighing and the real characteristics of the sensor.
(2) Application error
This error is mainly caused by operation. The main reasons for this error are sensor installation errors, incorrect insulation between the sensor and the measurement site, errors in the purification process of air or other gases and other errors caused by various wrong operations.
(3) Dynamic error
This error is mainly because the sensor will have strong resistance under static conditions, so the response speed to the change of the input parameter is relatively slow, and it can even be sensed after a few seconds.
(4) Environmental error
This error is because the load cell will also cause errors due to some external environmental factors such as temperature, wind, vibration, altitude, etc.
Load cell is one of the most widely used sensors in real life. Many ordinary people can see it at home. The load cell itself has the advantages of strong structure and durability, but in the process of use and installation, if not pay attention, it will also affect its performance.
For small metrology sensors, they should be protected from shocks that will affect the accuracy of their future measurements. A large number of measurements of the product itself is very important. Special handling tools should be used when handling. When it falls on the ground, it slows down to avoid damage to its internal equipment due to vibration. At the same time, install the base to be placed. The base should be level and clean, and there should be no sundries. Any load cell should avoid overload measurement during use, which can make the deformation of the elastic body irreversible and cause permanent damage. In the process of leveling, it is best to use the sensor level so that it can be installed on the same level to ensure the consistency of its load. The sensor should be bolted to ensure a certain tightening torque and will not loosen over a long period of time.
The sensor is installed as far away as possible from high-power equipment, because its own output signal is relatively weak, usually in the millivolt level, and is susceptible to interference. In this case, if the sensor is covered and the output signal is transmitted with shielded twisted pair, the performance of the sensor will be better. When laying the cables, it is also necessary to avoid laying them in parallel with the power cables. When they must be placed parallel, the distance between them must be more than 50 cm.
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