Two accurate test methods that users of checkweighers cannot ignore
Two precision test methods that users of checkweighers can’t ignore. Checkweighers are critical equipment on automated production lines. They have high accuracy, fast speed, and can store the weight of a single product and the total weight of each batch. However, in the process of using the checkweigher, if you want to ensure that each batch of products can be accurately measured, you need to perform an accuracy test on the checkweigher. How to perform the correct and accurate test? The following editor has collected two test methods for you, hoping to help you. The first test is to pass the same product through the checkweigher 10 or 20 times to ensure that the direction of the product is consistent with your actual production direction during each pass. 1. Record each data. There are some checkweighers that can automatically record and calculate the standard deviation. If the checkweigher cannot be calculated automatically, you can use the STDEV formula in the Excel table to calculate. 2. After having the standard deviation, multiply it by 6 to get the unconfidence interval (a globally recognized method for calculating the uncertainty of dynamic checkweighing). 3. Retrieve TNE(-T1) in the table below. For example, if your product weight is 200g, then TNE(-T1) is 5% or 9g. 4. Now calculate a quarter of this 9g, which is 0.25 x 9g u003d 2.25g. This value is your repeatability limit. 5. If the unreliable interval you calculated at first is greater than 2.25 g, then this checkweigher is unavailable under this setting. All products of different types and weights that are checked on the checkweigher need to pass this test. If you want to do better, repeat this test every once in a while, record and analyze the trend of each test, and see how the test results change over time. Based on this trend, you can determine how often you need to perform such a test. These records and trend analysis are also effective proof of the property insurance risk assessment by users of checkweighers. The second test is also carried out using the tested product. In addition, a calibrated static scale is also required. The resolution of the static scale needs to be the same as or higher than that of the checkweigher machine. This inspection needs to be performed before, after, and at the end of a batch. Similarly, this test can be used for trend analysis for further risk assessment. 1. Use an adjustment weight with a weight similar to the product to check whether the static scale can be weighed correctly. 2. Pass the product through the running checkweigher, and then place it on the static scale for weighing. Compare the weight value obtained on the checkweigher with the weight value obtained on the static scale. If the difference is greater than 1/5 of TNE, this checkweigher machine is not applicable. During batch processing, some checkweighers have a built-in weight check function, which will remove the product that is only used for testing and display its weight on the screen to facilitate testing. 3. Repeat this test at least once to check the repeatability of the checkweigher. For example, if the rated weight of our product is 200 g, the weight displayed on the checkweigher is 200.4 g, and the same product is taken to the static scale, and the weighing display is 199.7 g. The difference is 0.7 g. We know that the TNE of a 200 g product is 9 g. One fifth is 1.8 g. 0.7g is less than the limit of 1.8g, and the checkweigher can measure it and use it normally. If you want to make the inspection accuracy of each batch of products meet the standard, you need to perform the above two tests, and write these two tests into your standard workflow. After a period of time, repeat these two tests. As long as you pass the test, you can use this checkweigher with peace of mind.
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