Calibration of Weighing Display

From the owner's point of view, a weighing display, often called a scale or balance, can provide the correct weighing results.The use of weighing meters and reliable weighing results can be very different.Weighing displays for legal purposes must be legally verified.

If a weighing meter is to be used in a quality system, the user must define its measuring capability.In any case, the owner of the meter or the user responsible for the measuring process of the meter must choose the procedure for the maintenance of the weighing meter to achieve the required measuring capacity.

From a regulatory point of view, the quality of the weighing display is already stipulated by OIML.Calibration is a way for the user to obtain evidence of the quality of the weighing result, and the user must have knowledge of the application of the calibration information.

1. Calibration and verification are legal

The weighing display can also have special functions.One of these functions included is required for its legal verification, such as when the cargo is measured based on the weight of solid materials.The functions may vary slightly in different countries, but in the EU they are the same, at least for this stage, weighing meters have been introduced for use.

Inspection and calibration follow different philosophies.Calibrate the description indication and the reference (standard), including the deviation between allowances, while verifying the maximum allowances for the error of the description indication, which is all feasible for weighing.The actual work of these two methods is very similar, and both methods can be used to confirm the measurement capability, as long as there is no necessary legal verification.The terminology and use cases used for previously validated measurement functions, and weighing techniques in general, are based on calibration and validation of these practices, even for general weighing issues (non-legal).

2. Confirm the collection of information

The capacity of the weighing meter should be determined by estimating the quality of the measuring device used.In practice, this means investigating the efficiency of weighing meters;This operation is called calibration (or validation).A calibration provides information on a temporary basis and a series of calibration provides time-dependent information.The method of calibration should be chosen, for example, if it provides sufficient information to evaluate the required measurement tolerance, and the method should be accurate and achieve similar results in all calibrations.

To compare the deviation or error indication given by a weighing meter in a set of criteria, however, in order to be able to define measurement tolerances, we need more detailed information about the weighing display, such as repeatability, eccentric load, lag, etc.We must remember that the quality of the measurement error assessment depends on the information collected through calibration.

The use of a calibration procedure that calculates the deviations and measurement errors after each calibration and, if necessary, the same steps to produce a calibration certificate -- is the best way to achieve reliable information for comparison.This type of program is capable of storing the history of all calibration measures, including information on other measuring devices.The monitoring system is also convenient.The most important aspect of a calibration program is that it allows the user to select a calibration method that corresponds to the required measurement tolerance level and displays the history of the calibration, in this way providing the user with comprehensive information about the measurement capability.

3.Purpose of calibration and validation

Calibration is a process whereby the user is able to confirm the correct function of the weighing meter based on selected information.The user must define the allowable range of deviations from the true value and the required measurement error.If these values are exceeded, adjustments or repairs are necessary.

Calibration itself is a short-term process;Our idea is that the weighing display remains in good working condition until the next calibration.To do this, the user must determine all external factors that may affect the proper operation of the weighing meter.Problem factors may include the impact on the environment, the use of the weighing meter and how often the instrument needs to be cleaned, zero point periodic monitoring and constant quality indicators.

Today, functions that measure metrics, as well as many other tools, are microprocessor-based.They have several possibilities for adjusting the parameters during the measurement.Calibration should be set using parameters based on normal use.It is important for the users of the metrics, as well as the calibrators, to be familiar with these parameters and to use their protocols.Because of several parameters in use, it is always important to manually use a weighing meter that is easily accessible to the user.

4. Contents of calibration certificate

Usually, calibration certificates are calibrated against documents such as quality system audit evidence.However, a quality system usually involves measurement traceability and known tolerances of measurement measurements.A separate measuring equipment calibration certificate is used as a tool to evaluate the traceability of the device for handling measurement errors and displaying problems.

The measurement error on the basis of calibration is better than that of routine measurement.Therefore, the user must measure the error of the process and compare this value with the required process tolerance measurement.

5.The summary

Calibration (or verification) is an essential tool used to maintain a measuring system.It also helps the user get the required measurement quality in the process.

NOTICE: This site is reproduced by the editor of this website. The purpose of the reprint is to transmit more information. It does not mean that this website agrees with its views and is responsible for its authenticity. If you are involved in the content, copyright and other issues, please contact us within 30 days, we will delete the content in the first time! [Declaration] The copyright of this article belongs to the original author. The content is the author's personal opinion. This site is only for reference and does not constitute any investment and application advice. This site has the final interpretation of this statement.