Section17:Electronic Balances

From Assay Guidance Wiki

Analytical balances are accurate and precise instruments to measure weights. They require a draft-free location on a solid bench that is free of vibrations. Modern balances have built-in calibration weights to maintain accuracy. Older balances should be calibrated periodically with a standard weight. A few weighing tips follow:

• Do not bump or place objects on the bench after zeroing the balance.
• Weigh powders on weighing paper or in weighing dishes. Handle objects with tongs, gloves, or weighing paper to prevent fingerprints.
• Let hot objects cool before weighing.
• Weigh hygroscopic materials rapidly since they will absorb water during weighing.
• When making repetitive weighings always use the same procedure.
• Ensure that the balances are calibrated routinely.
• It is absolutely important to keep the balance pans and the area around precision balances clean. Clean up after each use for safety and convenience of others.
• In dry cold weather, weighing fine powders can be a problem due to static charges that develop on particles. Devices are now available for neutralizing electric charges of the material while it is still in the container. Use of these devices are highly recommended for accurate weighings.