Selection Requirements, information can be found on number of scale divisions, value of the verification scale division, and minimum capacity for scales. Table 7a. Additionally, the scales code discusses prescription scales as being Class I or II. This means that all laboratory and packaging scales must meet Class I or II requirements. If you do decide you want to have your scale calibrated once it arrives, where do you go?
Third-party calibration services are often the solution, but not all third-party calibration services are created equal. Your ultimate goal is to restore your scale to its original, optimal accuracy state, so the details matter. Some third-party calibration services, like Precision Solutions , will not only calibrate the scale, but also make adjustments and perform repairs as needed to get the deviation from the mass standard back within tolerance. Some are calibrated once per month, others are only calibrated once per year, while some are even spot checked daily for accuracy.
However, your need may vary based on the information below. If your scales are used multiple times throughout the day, every day of the week, normal wear and tear will occur faster than in scales that are used a few times per week.
Therefore, if you use these scales more frequently, they should be calibrated more frequently — perhaps monthly. The surrounding environment also plays a role. For example, if your scale is in an area that contains dust, fluids, or other substances, your scale could have a buildup of these substances that interfere with the performance of the scale. Or, if you have the scale located in a place where there are vibrations, static electricity or mechanical shock, scale accuracy can suffer.
In general, you should also consider a more frequent calibration to ensure these substances and other work environment factors are not getting in the way of getting a precise weight.
Finally, consider how important an accurate weight is to your business. But what about rocks and stones from a quarry where a truckload might only be worth a few hundred dollars. Calibrations are done at a variety of frequencies, depending on a variety of factors. While the frequency of calibrations depends upon use, the rapid deterioration of accuracy warrants additional troubleshooting. Many companies, like Precision Solutions, will work with you to learn more about your process and then create a maintenance plan tailored to you and your equipment.
Of course, ideally, everything would match up perfectly. Eliminating the need for any percentage calculations is ideal, as those additional calculations only leave more room for error. The manufacturer will specify accuracy and tolerance for your particular scale, but you should not use this as your only source to determine the calibration tolerance you will use.
To narrow it down even further, the calibration tolerance should be consistent with other, similar instruments at your facility. This broad adoption has provided a uniform system for investigating scales, ensuring consistency, and verifying accuracy.
These factors enable businesses to flow efficiently through a universal trust in weighing. If done correctly, a scale that passes HB44 procedures will consistently provide accurate weighing results within an acceptable amount of uncertainty. To accomplish this, Handbook 44 outlines a variety of testing procedures for different situations, but the three most significant are the linearity, shift tests, and tolerance.
Utilizing a minimum of three points, technicians apply increasing loads to the scale platform and compare the reported value to the sum of the certified test weights. This test ensures the scale is accurately reporting weight across its entire range of use, not just a single point. Sometimes called a corner test or Excentricity Test, HB44 addresses these errors by requiring technicians to shift weight to each quadrant and compare the reported weight to the sum of certified test weights.
The weights and measures branch is tasked with ensuring equity in the market place. Inspectors use a variety of International and National standards along with Kentucky Revised Statues and Administrative Regulations to ensure that commerce is conducted fair and equitable manner. The branch administers the following programs. The gas pump program is responsible for the testing of retail motor fuel dispensers for compliance with NIST Handbook 44 requirements including the quantity delivered is accurate and that the total price is computed correctly.
Inspectors serve both consumers and businesses by assuring equity in the marketplace. The Kentucky Department of Agriculture's Motor Fuel Quality Law requires that each retail business that sells motor fuel be registered. The Motor Fuel Quality Program is responsible for the inspection and testing of gasoline, gasoline-alcohol blends, diesel, and biodiesel fuels to ensure that the quality of the product complies with Kentucky state law and ASTM American Society for Testing and Materials standards and specifications.
The Limestone Inspection Program provides analysis of agricultural grade limestone. Limestone is used as a neutralizing agent for soil acidity and is tested in the latter parts of summer and winter so results are available before the spring and fall dustings. Any owner who conducts a business for the purpose of offering or exposing limestone for sale, must be licensed with the Kentucky Department of Agriculture annually.
This division inspects point of sale weighing devices for accuracy.
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