The analytical balance is a measuring instrument that has a high degree of precision, but which in turn requires experience and skill from the operator. Its creator was the Scottish chemist Joseph Black in the year 1750, from there this type of balance has become an important scientific instrument to obtain accurate measurements.
Steps to use an analytical balance
- Check that the balance is level: check that around the screen there is a bubble indicating the level of the balance. Where the balance is located there should be no inclination. The weighing pan must be exactly parallel to the ground.
- Turn on the balance: Press the power button, until the display lights up or a power-on signal is shown. There should be nothing on top of the pan, so at the beginning the measurement should be 0 grams.
- Place the watch glass or waxed paper in the center of the inner pan of the balance, these have the characteristic that they do not adhere to the sample and can be easily cleaned.
- The sample to be weighed is placed on the watch glass or wax paper.
- The sample is removed and the surfaces are cleaned: Once the desired quantity is weighed, the sample is removed and the paper or watch glass is cleaned. Finally, it is recommended to pass a soft brush over the pan, to remove any residue that has remained on the pan and inside the balance.
What should you avoid when using an analytical balance?
- Prevent equipment that produces high magnetic fields or vibrations such as centrifuges, electric motors, compressors and generators, from being installed in the surroundings.
- Avoid being under the direct influence of air conditioning systems (drafts) and sunlight.
- Avoid proximity to heat radiators, fans or a door.
- Avoid electrical outlets in poor condition, and that do not have a ground pole.
- Avoid touching the measuring plates directly with your fingers.
Care of an analytical balance
An analytical balance is a piece of equipment that is very important and therefore, for its proper functioning, certain basic care must be taken, such as, for example, always checking the calibration of the balance, leaving it plugged in and turned on to maintain the thermal balance of the circuits. electronic devices, but always leave it in stand-by mode, avoiding the need for a new warm-up time.
And finally, constant care must be taken with the weighing jar and pan, reading, calibrating, and maintaining the balance to ensure accurate weighing.
It is recommended to calibrate analytical balances regularly, even more so when it is being operated for the first time, if it has been moved, after any leveling and after large variations in temperature or atmospheric pressure, modern analytical balances perform this function, an automatic way, when they detect any environmental variation.