Analytical balance is used to measure mass with a very high level of precision and accuracy, because unlike a spring scale, its accuracy is not affected by differences in local gravity. Changes in the gravitational field strength caused by equilibrium movements will not change the measured mass, because the force moments on both sides of the balance beam are affected equally by the gravitational pull.
A high-precision weighing pan (0.01 mg or better) is inside a transparent enclosure with the door so that dust does not accumulate and any air flow in the room does not affect the balance operation. The use of an analytically balanced ventilated safety cover that has a uniquely designed acrylic airfoil allows smooth and turbulent free air flow that allows weighing as little as 1 micro gram of mass without fluctuation or loss of product. Samples must be at room temperature to prevent natural convection from forming air flow inside the enclosure, which can affect the weighing process.
Analytical precision is achieved by maintaining a constant load on the balance beam, reducing the mass on the side of the beam that is the same as the sample added. The final balance is achieved using a small spring force, rather than reducing fixed weight. This allows weights to be added as subtle adjustments.
The analytical balance or scale used in the laboratory may be in various shapes and sizes. Although often used interchangeably, scales and balances have different uses. Balance compares the mass of two sets of objects, while the scale determines the mass of an object or set of objects. The most commonly used types today are beam balance, spring balance, top loading balance, analytical balance, and precision scale.
Chemical analysis is an area where this balance is often used, because it is designed for high idexx indonesia precision that is useful in quantitative chemical analysis. The top loading balance, which can measure objects up to 200 g, is cheaper but also offers less resolution than other types of balance. The top loading balance is considered a semi-analytic balance, with readability of up to three decimal places (up to 0.001 g). Precision balance reads 0.01 g. This results in stable readings in a wider range of environmental conditions than analytical models, becoming less sensitive to temperature fluctuations.
Microbalances and ultra-microbalances are used to weigh the smallest sample. They offer capacities of up to 6 g with readings of up to seven decimals (0.0000001 g). Electronic scales and balances can provide weights in more than a dozen units, including grams, kilograms, pounds, newtons, grains, and ounces.
Many things can affect the accuracy of analytical balance. The laboratory environment, operating temperature, humidity, vibration and ventilation currents can all affect performance. Therefore, it is important to maintain balance in a closed space, keep it clean and ensure it is properly leveled. It is equally important to ensure that maintenance and maintenance is carried out regularly. There are also considerations of personnel who need attention. It is important to know who will operate and maintain the equipment and the type of training they have received.
Tidak ada komentar:
Posting Komentar