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Smart Weigh is committed to helping clients increase productivity at a reduced cost.
Author: Smartweigh–Multihead Weighter
Using the multihead weigher also selects the multihead weigher accuracy level. The accuracy level of the multihead weigher includes multihead weigher performance metrics such as nonlinearity, stress relaxation, stress relaxation repair, lag, repeatability, and sensitivity. In the case of using a multihead weigher, it is not necessary to simply pursue a perfect and advanced multihead weigher, but not only to consider the accuracy requirements of the electronic scale, but also to consider its cost.
The selection of the multihead weigher level must consider the following 2 criteria: 1. Consider the provisions of the instrument panel typing. The weighing display instrument can display the information weighing result after the output data signal of the multihead weigher is enlarged, A/D conversion, etc. are solved. Therefore, the output data signal of the multihead weigher must be greater than or equal to the input signal size specified by the instrument panel, and the output sensitivity of the multihead weigher must be replaced by the matching formula between the multihead weigher and the instrument panel, and the calculation result must be greater than or equal to the input number specified by the instrument panel. sensitivity.
The matching formula of the multihead weigher and the instrument panel: multihead weigher output sensitivity * encouraged power supply voltage * sub-degree of myopia of the larger weighing scale of the scale * number of multihead weighers * multihead weigher measurement range For example: a quantitative package weighing 25kg machine, the maximum degree of myopia is 1000 measurement ranges; the scale body selects 3 L—BE—Type 25 multihead weigher with a measuring range of 25kg and a sensitivity of 2.0±0.008mV/V, the working pressure of the stone arch bridge is 12V; the scale adopts AD4325 instrument panel. Ask if the selected multihead weigher can be matched with the dashboard. Solution: After inspection, the input sensitivity of the AD4325 instrument panel is 0.6μV/d, so according to the matching formula of the multihead weigher and the instrument panel, the specific input data signal of the instrument panel must be: 2×12×25/1000×3×25=8μV/d>0.6μv/d Therefore, the selected multihead weigher considers the regulation of the instrument panel input sensitivity and can be matched with the selected instrument panel.
2. Consider the requirements for the accuracy of an electronic scale. An electronic scale is mainly composed of three parts: scale body, multihead weigher and instrument panel. In the case of selecting the accuracy of multihead weigher, the accuracy of multihead weigher should be slightly higher than the calculated value of basic theory, because basic theory usually suffers from problems. The limitation of objective reasons, such as the compressive strength of the scale body is a little worse, the characteristics of the instrument panel are not very good, the office environment of the scale is relatively extreme and other factors immediately endanger the accuracy requirements of the scale, so it is necessary to improve the regulations from all levels. It is also necessary to take into account the economic benefits and ensure that the goal is achieved.
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