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.

Spotlight on Pumps: Filling Pumps

TOPICS:Filling pumps filling systems

Posted By: Cole-Parmer Blog Team August 3, 2015

Tabletop Filling systems are ideal for the repetitive dispensing of free-flowing, semi-viscous (such as syrup, lotion, or thin oils), or viscous fluids (such as paste, cream or detergent). They can dispense solutions for pharmaceutical small batch filling needs with precise accuracy and a high cycle rate.

The liquid is drawn in by the intake stroke and dispensed by the discharge stroke. Volume control enables you to increase or decrease the desired dispensing volume. The system operates via a footswitch or continuous mode cycle.

Single-head or dual-head filling stations are available in tabletop models. Models may vary in their power capacity—choose the VAC that suits your application.

Spotlight on Pumps: Filling Pumps

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