Written by Rachel Kohn
Analytical balances are precision instruments providing readouts* to an accuracy of 0.1 milligram and with a linearity** of ± 0.2 milligram. Maintaining this precision is essential to GLP and to be in compliance with regulations guiding the particular industry in which the instruments are used.
For that reason, an analytical balance must be recalibrated at regular intervals and records maintained in further conformance with GLP and ISO standards. Some analytical balances such as the KERN ABT, ABJ and AEJ models available from Tovatech provide automatic internal calibration. Others such as the ALS-A model are externally calibrated at intervals that should be defined in the company’s operations manual.
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Written by Rachel Kohn
A sous chef exercising a bit of creativity when following a recipe for a dessert might discover a significant improvement in the final product. Or maybe not. Such creativity is to be fully avoided when compounding drugs or other products where strict control of ingredients is mandatory. A precision balance employed for the purpose of recipe weighing and record keeping is the tool of choice in applications where regulatory compliance and lab efficiency are goals.
Recipe weighing using precision scales such as the Kern PCB available from Tovatech also supports research in labs where technicians create and vary formulations while seeking to develop new or improved products.
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Written by Bob Sandor
Technology and miniaturization have enabled manufacturers to place a powerful package of functions into a precision digital scale. As a result, these powerful, precise, compact and lightweight digital scales find use in the laboratory, in quality control departments, as industrial scales, and myriad other applications.
Multi-functionality is the term that best describes modern digital scales. A single scale, for example, can be used for such diverse tasks as check and recipe weighing, tolerance weighing, counting, dispensing, percentage determination, totalizing and more.
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Written by Bob Sandor
Precision digital scales and analytical balances must be recalibrated for accuracy to be in compliance with international standards and to maintain good laboratory practices. Analytical balances such as the Kern ABJ series can be recalibrated using internal motor-driven weights. The internal calibration sequence is initiated manually. Semi-micro analytical balances such as the Kern ABT series automatically recalibrate using internal weights under four scenarios: 1) Four hours after the previous calibration; 2) When there is a fluctuation in temperature of 0.5oC (0.9oF); 3) When the balance is switched from standby to weighing mode and condition (1) or (2) has been met or 4) If the balance was disconnected from its power source.
Other scales require external recalibration, which is performed by using test weights under procedures that should be spelled out in your company’s Quality Management manual.
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