The manufacturer of the checkweigher tells you how to set the upper and lower limits of the online dynamic checkweigher?
The online weighing characteristic of the checkweigher conforms to the normal distribution curve. Multiple measurements of the same product will have different values, and these values u200bu200bwill be distributed within the interval of this normal distribution curve. If the lower limit is smaller than the upper and lower limits requested by the user, these values u200bu200bwill be distributed within the normal distribution interval, so the upper and lower limits set by the weighing scale are within a smaller range than the upper and lower limits requested by the user. 1. General setting method. Add or subtract 3 times the standard deviation within the nominal weight range of the product, that is, the upper and lower limits and the upper and lower limits. The error rate of this setting method is 0.3%. Others will include a range of nonconforming products with a standard deviation of 6 times. This setting allows most qualified products to pass through, ensuring the continuity of production, but unqualified products may enter the qualified range (depending on the critical point position of unqualified products). 2. Meet 100% without rejecting qualified products. Then, the standard deviation of 3 times needs to be enlarged to the standard deviation of 4-6 times. Although this setting can satisfy 100% of qualified products, there will be more unqualified products entering the qualified range. 3. Reach 100% rejection of substandard products. To meet this requirement, it is necessary to add 4-6 times the standard deviation of the heavy products among the ultra-light and unqualified products as the lower limit of the qualified products, and subtract 4-6 times the standard deviation of the overweight and unqualified light products as the standard deviation. The upper limit of qualified products. If the user's product distribution range is concentrated near the mean range, qualified products will be less likely to be mistakenly rejected, and it can be guaranteed that the unqualified range will be 100% rejected. 4. Ideal situation. The chart below is the ideal state of interval setting, which is related to the uniformity of the user's product and the application of the customer's request to exclude non-conforming products. In this way, 100% of unqualified products can be eliminated, and 100% of qualified products can be passed. In short, according to the specific requirements of customers and the requirements of weighing accuracy, the upper and lower limits of the checkweigher machine are set. Zhongshan Kenwei Automation Equipment Co., Ltd. is a professional checkweigher machine manufacturer with many years of experience in weighing instrument manufacturing. The products are sold at home and abroad. We tailor-made online checkweigher machine solutions for online weighing scale production lines for you. Please feel free to contact us for more information. More details!
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