Analytical balances are accurate and precise instruments used to measure masses. They require a draft-free location on a solid bench that is free of vibrations. Some modern balances have built-in calibration masses to maintain accuracy. Older balances should be calibrated periodically with a standard mass.
Here are a few tips to follow to insure proper care whenever you are using an electronic balance of any kind:
- Do not bump or place objects on the bench after zeroing the balance.
- Mass powders on paper or dishes. Handle objects with tongs, tweezers, gloves, or paper to prevent fingerprints.
- Let hot objects cool before massing.
- Mass hygroscopic materials rapidly since they will absorb water during massing.
- When making repetitive massings always use the same procedure.
- DO NOT go off and leave spilled chemicals on or around the balance! Report any spill to the instructor so that she may clean it up in a proper manner, re-calibrating if necessary.
|Picture of the Mettler AJ100 analytical balance:
Operating Instructions for the Mettler AJ100 Balance:
Picture of the Fisher analytical balance:
Operating Instructions for the Fisher Balance:
Send questions, comments or suggestions to
Gwen Sibert, at the
Roanoke Valley Governor's School
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