How To Calibrate Weighing And Measurement Equipment

When it comes to recording measurements there are different weight instruments available in the industry. While there are certain weighing tools that are designed only measure a few grams of load in laboratories and have proven to be very accurate, there are others that are basically designed as industrial weighing instruments for large equipment such as truck mass.

The use of weighing and measurement equipment is not strange as they can be found almost everywhere. A common place where such equipment can be found is the grocery store. In order to ensure that these equipment (whether small or large) are working correctly and accurately, there is the need for regular calibrations.

The only way to know how accurate a weighing instrument can be is by ensuring a proper metrological traceable calibration, as is the case with any measurement instruments. Based on legislation, many weighing and measurement equipment are employed for legal measurements which are part of a statutory or legal verification program.

When it comes to calibrating weighing and measurement equipment, it is important to understand that the process is based on certain determine factors such as forensic investigation, traffic (marine or air) safety, health care, and a quality system (ISO9000). Regulations such as OIML, NIST Handbook 4, and EURAMET Calibration Guide are dedicated to calibrating weighing instruments.

Here is what you need to know about calibrating weighing and measurement equipment.

Make necessary preparations

There are certain things you need to clarify before you even begin calibrating the weighing instrument. First and foremost, consider the technical characteristics of the equipment. This includes the d value and max weight. Also consider the max error allowed i.e. the accuracy requirement and any adjustment, if necessary.

It is advisable to calibrate the equipment in the same location where the instrument is employed, so as to ensure a full calibration of the whole measurement range. Ensure to make adequate weight available for the calibration process. The weighing instrument should be active a few moments before the calibration (about 30 minutes). There should be an equally stabilized temperature range around the calibration location suitable for the weights.

For small and accurate weighing equipment, ensure that they are placed at a horizontal level. In order to ensure an efficient working state, a few weights should be closely placed to the maximum range of the instrument. This is just a simple way of performing a pre-test.

Types of calibration tests

Weighing test

If you are looking to simply calibrate or test the accuracy of the weighing equipment, the weighing test is recommended. This can be done with increasing and decreasing weight throughout the whole range.

Repeatability test

Repeatability problems can affect any weighing instrument. In most cases, such equipment does not offer precise or accurate measurements for weights. There often tend to be varying results when the same load is measured several times. A repeatability test is performed to identify the repeatability status of the equipment.

Eccentricity test

A weighing instrument can produce a slightly different result when the load is placed outside the center of the load receptor. An eccentricity test can be performed to identify how much effect the location of the load has.

 

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How To Calibrate Weighing And Measurement Equipment