What precautions must be taken when measuring the mass of an object using an electronic balance?
Measuring Mass
- Always check that the balance is level before using it.
- Never weigh directly on the balance pan. Always use a piece of weighing paper to protect it.
- Never add chemicals to a container or piece of weighing paper while it is on the balance.
- Do not weigh hot or cold objects.
How do you avoid analytical balance weighing errors?
Place analytical balances in a protected environment away from temperature extremes such as direct sunlight, heating and AC vents. Avoid heavy traffic that causes vibrations in the weighing area. Avoid overloading, which could cause hysteresis of mechanical parts.
What should you do before you use a balance?
Before starting to use your analytical balance, ensure it is calibrated. Calibration can only happen once the balance is level – this may require you to adjust the back feet of your balance, or you may have to simply run the auto-leveller, such as that found in the Cubis® range.
What is the use of analytical balance?
Analytical balances are precision measuring instruments used in quantitative chemical analysis, to determine the mass of solid objects, liquids, powders and granular substances.
How do you use electronic balance step by step?
Place the electronic balance on a flat, stable surface indoors. The precision of the balance relies on minute factors and wind, shaky surfaces, or similar forces will cause the readings to be inaccurate. Press the “ON” button and wait for the balance to show zeroes on the digital screen.
What factors affect the results obtained from the analytical balance?
The accuracy of any weighing equipment can be affected by environmental factors and operating conditions, such as temperature, air pressure, vibrations and humidity.
What is the wrong consideration to use analytical balance in lab?
Analytical balance errors can arise when the instrument records an inaccurate weight of samples owing to internal and external influences unknown to the operator or because of poor weighing practices. While errors that are induced externally may be a result of numerous factors, they can be eliminated or reduced easily.
When should you use an analytical balance?
An analytical balance provides the mass of an object to the nearest 0.0001 g (or 0.00001 g). An analytical balance should therefore be used when an error smaller than 0.01 g is required. Analytical balances are very sensitive and are painstakingly calibrated.
How do you check the level of an analytical balance?
Before weighing anything on the analytical balance you must make sure that it is leveled and zeroed. To check the leveling on the balance, look at the leveling bubble on the floor of the weighing chamber. If it is not centered, center it by turning the leveling screws on the bottom toward the back of the balance.
How do you open the door of an analytical balance?
Open the door of the analytical balance. Using Kimwipes, gloves, tongs or tweezers (not your bare fingers because fingerprints add mass) place the weighing container or weighing paper on the balance, shut the door and wait a few seconds until the unit stabilizes.
What’s the best way to clean an analytical balance?
Operating manuals shipped with analytical balances provide instruction on cleaning these precision instruments. First we suggest you remove loose samples with a soft brush or a gentle vacuuming. Follow instructions on removing and cleaning the doors enclosing the weighing area.
What’s the minimum weight for an analytical balance?
Electronic balances deliver weighing results via digital display: from general-purpose balances with a minimum display of 10mg or 1mg to analytical balances with minimum displays of 0.1/0.01/0.001mg. Because of this, people think that if the weighing sample is simply placed on the pan, an accurate weighing result will be displayed instantly.