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.

Using a Versatile Gas Mass Flow Controller

TOPICS:flow controller gas mass flow controllers

Cole-Parmer® Flow Gas Mass Flow Controller, for gas, 0.1 to 10 LPM

Posted By: Cole-Parmer Blog Team June 16, 2015

What happens when a customer really likes an instrument? A professional researcher used the Cole-Parmer^® Flow Gas Mass Flow Controller for Gas and wrote to us:

“These are very flexible instruments, pre-loaded with calibration data for a wide range of gases so they can be switched to a different gas as needed. This makes them much more versatile than comparably priced controllers that are calibrated for only one gas. They also report several condition parameters (outlet pressure, temperature, either volumetric or mass flow) that can be logged during an experiment. This feature also makes them more generally useful than other comparably priced controllers.”

Because the unit worked so well for this professional, he recommends it for use in labs and research.

Using a Versatile Gas Mass Flow Controller

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