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Increase the net content of prepackaged goods the accuracy of absolute volume measurement techniques

Capacity value; single-mark volumetric flasks is a typical single-groove container, it can only measure the capacity of a single value. Of course,[link widoczny dla zalogowanych], is a multi-use gauges easy groove, but more groove gauges the accuracy of the low, especially JJF1070-2005 on net content measurement uncertainty requirements for 0.2T (T to allow the shortage of quantity), to higher than the original JJF1070-2000, the past can be directly measured using the graduated cylinder to work, it may fail to meet requirements of the. Now I talk about the glass container with a combination of measurements to improve the method of measurement uncertainty. We know that a single groove in the accuracy of the flask used in the glass container is relatively high, generally 10 times higher than the cylinder, if the measurement process,[link widoczny dla zalogowanych], with most of the contents of the flask to measure the remaining graduated cylinder was measured with a small number, and then adding the measurement results, so that uncertainty of measurement than direct measurement of cylinder is smaller, for example: measurement of net content labeling of products for the 730mi,[link widoczny dla zalogowanych], we use measurements 1000ml graduated cylinder, graduated cylinder The capacity of tolerance to 5ml; and if the first flask with 500ml of the B class (tolerance 0.5m1) measurements, the remaining part of the contents of the graduated cylinder with a 250mi (Tolerance 1.0m1) to measure, together measuring the impact of the worst equipment is only 1.5ml, can be seen, so that separate measurement accuracy of the measuring instruments can be greatly improved. Since the measurement accuracy of the lowest cylinder, in order to improve the measurement accuracy, we can scale as much as possible the use of a single flask, so that you can use a small cylinder measuring range, improve the overall accuracy of measuring instruments. Net content labeling for some specifications just slightly less than the flask of special specifications, we can also use fill methods to simplify procedures and improve the measurement accuracy of measurement, such as 980ml net content labeling of goods, we can put all the contents down to a 1L volumetric flask, then the general contents of the flask reach the standard line, can not be read directly from the flask capacity values, we use straws or small multi-cylinder carved lines added, when added to the flask reached groove, the groove down from more than a straw or small cylinder measured dosage, this time, the net content of the product minus the addition of 1L. Glass container with the above combination of measurement methods, measuring instruments are introduced the components of measurement uncertainty than the measurement of a single cylinder to a significant reduction, it is a repeated measurement, operational factors component of the uncertainty caused by is likely to rise, which requires the operator to be careful in the operation, meticulous, as far as possible to avoid the phenomenon of human error and the wall. JJF1070-2005 in accordance with the requirements, not all of the net content of the product specifications can not be measured directly with a single cylinder, such as 200ml net content labeling of products, the direct use 250ml graduated cylinder to measure to meet the requirements of the: In accordance with 75 orders, 200ml short amount of time to allow T to 9ml, 250ml graduated cylinder capacity of tolerance to 1.0ml, to allow one-ninth of the amount of the shortage. Moreover, combination of measurement methods used glass container, and sometimes can be a combination of cylinder + cylinder methods, such as: 330ml specifications of goods (T = 9.9m1), can not be directly used 500ml graduated cylinder (tolerance 2.5m1) were measured can be used 250mi graduated cylinder (tolerance 1.0m1) plus 100ml graduated cylinder (tolerance 0.5m1) a combination of methods of measurement. According to experience, we believe that: (1) For lOml of goods within a 250mi, the basic content can be used with the dimension value of the net closest to the individual specifications of the amount of direct measurement of human-type cylinder capacity value. (2) For more than 250mi of goods, generally require combined measurement using glass container measurement. (3) The combination of glass container measuring method, because it is multiple measurements, operational factors will increase the corresponding uncertainty components, whenever possible, select cylinders plus a combination of flask measurements. (4) whether the amount of human-style cylinder with a single measurement or combination of glass container measurement, the temperature must be strictly constant temperature, it is necessary to measure directly the temperature in the contents. (5) operating factors on the absolute volume measurement uncertainty of a great influence on operations with particular attention to: first, the glass container to the horizontal; second, when the line of sight to the reading level, read the bottom edge surface; Third, the assessment of reading to be accurate, at least 1 / 5 degrees; the fourth,[link widoczny dla zalogowanych], holding time should be sufficient to avoid the hanging wall and the residue; Fifth, be careful when dumping should not spill. Author: Tan Hill, male, engineer. Company: Guangzhou Institute of measuring and testing technology. Address: 510030, Guangzhou City,[link widoczny dla zalogowanych], Guangdong Province, Yan Road 11. Received :2006 -07-21

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