Posted by admin | Posted in Uncategorized | Posted on 15-12-2007
Tags: balance, blog, diy, electronic, electronic balance, electronic balance board, electronic balance definition, electronic balance scale, electronic balance transfer, electronics
Electronic Balance
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Analytical Balance Specification - Integrating Its Features With Today's Weighing Needs
Medical and scientific research studies involve many experiments that need accurate weighing. Analytical balances must be very accurate to prevent critical errors in data analysis. Balances used for precision weighing in research labs are now designed to remain uninfluenced by external environment conditions. The goal is to reduce the margin of error and ensure the accuracy and reliability of data as much as possible.
Research and development labs use analytical balances extensively. New features have been incorporated into various models like electronic interfaces and automated systems. They are enhance the precision of weighing.
The early models had two weighing pans that were gradually replaced by the current single pan designs of the short-beam type. The mid 1970s saw the development of electronic balance configurations and a decade later, mono block balances were manufactured. These balances gave faster and more stable reading when compared with the earlier models. Based on weight, there are three kinds of analytical balance specifications in the latest models. The first is the ‘typical resolution' of 0.01 gram that all entry-level instruments come with. The second is the 0.1 milligram resolution that mono block analytical balances have. Very high-end balances that work on the electromotive compensation method have resolutions as low as 0.1 microgram.
The weighing speed, stability and accuracy of analytical balances have improved by leaps and bounds due to the kind of refinements and improvements made in each model. The Kern analytical balance is one of the most high-end devices known for its accuracy of weighing. Though the time it takes to stabilize itself is minimal, it gives very accurate results. It comes with a DKD calibration certificate.
Enclosed in a sturdy and robust enclosure made of metal, this analytical balance is unaffected by environmental and temperature conditions. However, it is advised to maintain the temperature between ten and thirty degrees Celsius to protect the balance from long-term damage. It is designed to ensure the maximum possible stability and consistency in weight reading. The balance is compact and weighs around seven kilograms. A single touch of a button enables the personnel to use this balance for weighing test samples in non-metric units. Reference quantities of ten, twenty, fifty and even a hundred can be used to conduct piece counting procedures. The RS232 interface is advanced and sophisticated. Studies show that this model has increased the overall productivity of analytical balance by an amazing twenty percent. Their stabilization time is also six times lesser when compared with the older and more traditional pan systems.
Analytical balances can now measure the densities of liquids, soils and other substances. The device software has built in density data of ethanol and water. Lab personnel can now choose different resolutions and various units for displaying weighing data and choose the required or desired accuracy of the system. An additional feature is the automatic calculation of the volume of the test sample. Manufacturers are trying to manufacture cost-efficient models as each additional feature further increases the price of the analytical balance.
About the Author
Dr. Bob Sandor is a Director at Tovatech, a leading North American supplier of analytical balances. When not busy running his company, he explores his fascination with the many aspects of various scientific & industrial devices. For more details on the above you can reach him through the analytical balance section of his website.
A beaker of water rests on an electronic balance that reads 995.0 g.?
A beaker of water rests on an electronic balance that reads 995.0 g. A 2.7 cm diameter solid copper ball attached to a string is submerged in the water, but does not touch the bottom. What is the tension in the string? What is the new balance reading?
I do not wish to look up the specific mass of copper for you. You can do that yourself.
I will tell you that no matter how it is arranged the balance will read the total weight of the beaker, water and the upthrust given to the copper.
That upthrust is the VOLUME of the copper ball by the specific weight of water 1g wt /cm^3
The tension in the string is the weight of the copper (volume * specific weight) less the upthrust given to it by the water.
That should be enough for a bright student to complete the calculations.
