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.

Why Use a Diaphragm Pump? | from Cole-Parmer Blog

Diaphragm pumps are popular in industrial applications such as chemical dosing. They have a long history of use in water and wastewater treatment and can also be found in food processing, pharmaceutical, and petroleum operations.

Why such versatility? These metering pumps tend to be robust, working for long stretches between maintenance. They do not have internal components that rub against one another or cause friction. They also:

Deliver high accuracy
Handle viscous liquids
Can achieve high pressures
Typically offer good suction lift

Diaphragm pumps are available in a wide range of control options. These include manual, analogue, flow proportioning, computer or PLC; ATEX versions are also available.

Some PVC models are ideal for pumping sodium hydroxide or sulfuric acids in low concentrations, and hydrochloric acids in low concentrations. Stainless steel versions move acetic acids and lithium chlorides. Check materials to determine chemical compatibility.

View our selection of diaphragm metering pumps.

Why Use a Diaphragm Pump?

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