What is the difference between an analytical balance and a precision balance?

An analytical balance provides readability of 0.1 mg or better, while a precision balance typically reads to 0.001 g or 0.01 g. Analytical balances include draft shields and are designed for highly sensitive measurements. Precision balances handle larger samples and are less affected by environmental conditions.

What readability do I need for my lab application?

You need a readability that is at least one-tenth of your smallest sample weight or required measurement increment. For example, measuring 100 mg samples may require 0.01 mg readability, while gram-level work may only need 0.01 g. Selecting higher readability than necessary increases cost without improving results.

Do lab balances need to be calibrated?

Yes, all lab balances require regular calibration to maintain accuracy. Calibration ensures measurements remain traceable to certified standards. Internal calibration simplifies this process by automating adjustments, while external calibration requires manual verification with certified weights. In regulated environments, calibration records must be documented and retained.

What is the difference between readability and repeatability?

Readability is the smallest increment of weight a balance will display. Repeatability is the degree of agreement between multiple measurements of the same mass, on the same balance, under the same conditions.

What is the best way to clean my balance to ensure accurate readings?

Inspect and clean before each use. A flannel cloth or soft brush works well for dusting and light cleaning. Use a non-abrasive cleaner for light spills, and a dry flannel cloth for glass parts. Set a regular maintenance schedule for deep cleaning to ensure optimal performance and instrument longevity.

Can vibration affect the accuracy of my balance?

Yes — even slight vibration from a heavy footstep can affect accuracy. Place the balance on a sturdy benchtop away from high-traffic areas such as hallways, elevators, stairways, and doors. If that placement is not possible, an anti-vibration table should be considered.

Centrifuges In the Laboratory | from Cole-Parmer Blog

Centrifuges are instruments that use centrifugal force to separate colloidal particles or substances of different densities, to remove moisture, for microfiltration, or to simulate gravitational effects.

Centrifugation is one of the most important and widely applied research techniques in biochemistry, cellular, and molecular biology. Current research applications rely on isolation of cells, subcellular organelles, and macromolecules, often in high yields.

Features to Consider

From personal microcentrifuges to general purpose and specialty centrifuges, you already have a choice to make in terms of centrifuge types. Here are a few features you may want to consider as well:

Anticorrosive material: Carbon fiber is durable and lightweight, and will hold up longer over time than metal or aluminum components.
Compact footprint: A compact centrifuge can save you valuable bench space.
Refrigeration: For samples requiring consistent temperatures, your centrifuge should be able to run at its maximum speed and still maintain a consistent temperature.
Rotor versatility: If you perform multiple tasks, choose a centrifuge that accommodates a variety of adapters. Select a model that doesn’t require the use of tools and that is ergonomically sound.
Throughput: Look for versatility in rotor and adapter options so that you can use your centrifuge to its optimal capacity.

See a full line of centrifuges.

Centrifuges In the Laboratory

Be the first to comment on "Centrifuges In the Laboratory"

Leave a comment Cancel reply