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Author: Smartweigh–Multihead Weighter
A multihead weigher is actually a device that transforms a quality data signal into an electronic signal output that can be accurately measured. When using a sensor, you should first consider the specific office environment where the sensor is located. This is particularly important for the proper use of multihead weigher. It is related to whether the sensor can work normally and other safety and use period, and even all electronic availability. reliability and safety factor. The multihead weigher is composed of a base, polyurethane elastomer, anchor bolts, cables and other parts.
Polyurethane elastomer is a bearing component, and the resistance strain gauge is pasted on the polyurethane elastomer according to a certain processing technology to form a Wheatstone bridge, and a set of stable high-precision switching power supplies are produced from the outside world. When the polyurethane elastomer does not bear the load, the bridge circuit is in a balanced state and the output voltage is zero. When the polyurethane elastomer bears the load, due to the deformation of the polyurethane elastomer, the internal resistance of the resistance strain gauge changes, making the bridge circuit unbalanced, and there will be a working voltage data signal output.
The size of the data signal output is positively related to the load on the polyurethane elastomer. What is a multihead weigher sensor is generally used with the supporting facilities of the weighing data digital display instrument. The weighing indicator provides a fine switching power supply for the sensor. In addition, the data signal output by the sensor is enlarged and actively filtered. After AD conversion and optical protection, the net weight value of the information can be displayed immediately according to the instrument panel. The analog signal output by the instrument panel is sent to the microcomputer to carry out the data processing method.
The old national standard will use a completely different target and application of the natural environment standard.“Weighing”and“Force measurement”The two sensors are considered as one, and no distinction is given to the experiments and evaluation methods. There are 21 index values in the old national standard, all of which are tested at room temperature; and the discrete system, the reason for the deviation of the backwardness, the reason for the deviation of the repeatability, the stress relaxation, the reason for the extra deviation of the zero temperature and its rated value The reason for the extra deviation of the output temperature is the cause of the larger deviation in the six index values to clarify the accuracy level of the multihead weigher, which is indicated by 0.02, 0.03, and 0.05 respectively. A force sensor used in electronics.
It can convert the force acting on the object under test into a quantifiable and verifiable output data signal according to a certain proportion. Fully consider the hazard of gravity acceleration and gas-water buoyancy of different application addresses to transformation, the key performance parameters of multihead weigher are the reasons for the deviation of the linear shape, the reason for the deviation of the lag, the reason for the deviation of the repeatability, the stress relaxation, the zero point Temperature characteristics and sensitivity temperature characteristics, etc. In a variety of electronic and quality metrology verification system software, the comprehensive control sensor accuracy is generally generated by the comprehensive cause of deviation, and the comprehensive cause of the deviation is connected with the electronic cause of the deviation. It is convenient to use a multihead weigher matched to a certain precision electronic.
The International Legal Metrology and Verification Organization (OIML) requires that the reason for the deviation of the sensor band δ accounts for 70% of the reason for the deviation of the electron band Δ, the reason for the deviation of the linear shape of the multihead weigher, the reason for the deviation and its requirements. In the temperature range, the total number of causes of deviation due to the harm of temperature to sensitivity, etc., cannot exceed the cause of deviation band δ. This allows the manufacturer to make adjustments for each component that contributes to the total deviation of the metrological verification, resulting in the desired accuracy.
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