How to choose the sensor of batching and weighing system in mixing station

The concrete batching plant uses an automatic batching system with sensors, which greatly improves the concrete batching accuracy and production speed. Therefore, the correct selection of load cells has become the key to improving the accuracy, stability and reliability of ingredients.

The principle of selecting weighing sensor for batching scale can be summarized as follows:

Choose according to the use environment. The first thing to consider is the use environment of the sensor, because the actual use environment of the load cell is related to whether it can work normally, as well as the stability and reliability of the entire batching weighing system.

For humid environments, sensors with better sealing performance should be selected, and appropriate measures should be taken to minimize the impact of the environment on the stability of the sensors, to ensure the reliability of the batching system and prolong the service life.

The range of the sensor. After determining the type of sensor, it depends on its range. Because the range of the sensor determines whether it is easy to use and durable. The range of the sensor used in the batching system is determined by a series of factors such as the mass of the material being weighed, the self-weight of the weighing, and the number of sensor settings. Even with the same weighing load, the selection of the sensor range is different for different batching scales. of.

The sensor range and practical experience of various mixing station manufacturers at home and abroad should be integrated into the selection. When the weighing instrument allows, the sensitivity of the sensor should be 2±0.02MV/V, and the full load range of the sensor should be the full load range of the batching scale. 50%～70%.

The accuracy of the sensor. It is required to choose from the focus of economy, practicality and sensor performance. The higher the accuracy of the sensor, the more expensive it is. The accuracy grade of the weighing sensor selected for the batching system of the mixing station is OIML R60#C3.

The sensitivity of the sensor. When designing the batching weighing system, it should be selected according to the parameters provided by the sensor manufacturer. Now, the sensitivity of the sensor is basically unified, generally 2±0.02MV/V.

Within the linear range of the sensor, the higher the sensitivity, the better, because high sensitivity is beneficial to signal processing. But it should be noted that the high sensitivity is susceptible to external interference that has nothing to do with the measurement, thereby affecting the measurement accuracy. Therefore, when selecting, the sensor itself should be required to have a higher signal-to-noise ratio to minimize the interference signal brought by the outside world.