Electric Analytical balance is a class of balance which is designed to measure small mass in the sub milligram range. It has some special appeal of its own and this has its own features and characteristics. Electronic analytical scales measure the force needed to counter the mass being measured rather than using actual masses. Single pan mechanical substitution balance maintains consistent response throughout the useful capacity is achieved by maintaining a constant load on the balance beam by subtracting the mass on the same side of the beam to which the sample is added.
A calibration procedure has some special appeal of its own and it has some own features and characteristics. It assures the analyst by which the balance is working very accurately. But make sure this calibration is only as fine as the analyst’s calibration technique. For the correctness of any balance this calibration is very much important. This is done by giving a base point as well as establishing what the filled capacity weight is. Since SPAN is usually the balance’s maximum capacity, the balance is now has two precise great point one is zero and another one is full scale. The balance is then calculated all amounts in between the baser point as well as the full capacity. Measurement uncertainty check the measurement of doubt shall be carried out by utilizing 10 mg weight. Put the external weight of 10 mg on the pan as well as note the 10 measurements. Now the calculation will come like this –
Measurement of uncertainty = standard deviation *2 divided by actual mass value. And make sure the measurement of uncertainty should be not more than 0.10. Calibration frequency shall be performed daily and after any maintenance and after the relocation as well as after the power failure of the balance. Lower as well as the higher load limits should be ensured for the performance check. Level of bubble is the center of the indicator as well as the internal calibration facility is available in the balance then it should also be performed every day before performance confirm of the analytical balances.
Weighing is one of the most common tasks in the laboratory. Balances have now been perfected to such a degree that no special weighing rooms are needed. Explore how to weigh in the right way. Technological advances in electronics have considerably simplified the operation of balances, reducing weighing times. Moreover the touch screen digital display makes operation of the balance intuitive. METTLER TOLEDO’s new Excellence Plus range of analytical balances incorporates a green status light to confirm that all the factors required for precise and accurate weighing in a Good Manufacturing Practice (GMP) regulated laboratory are correct and that the balance is ready for use. If one of these factors is not ready, then the light turns yellow to warn but indicate that it is still safe to weigh, or red to tell an analyst not to proceed. When the problem is corrected, the analyst gets the green light for weighing.