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.

Troubleshooting Gas Mass Flowmeters | from Cole-Parmer Blog

Gas mass flowmeters only work with dry gasses. Normally the gasses are pure as well. If the gas contains too much moisture, an errant reading will occur. In this case a gas dryer is needed.

What else may be happening when your gas mass flowmeter is not operating properly? Here are some possibilities:

Problem: The reading is too high

Solution: Known as “swamping,” this happens when the flow exceeds 10% beyond the maximum-rated capacity. Lower the flow and shut system down completely to restore performance.

Problem: No display/power

Solutions: Check to make sure all cables are connected correctly and the power supply has been correctly selected according to requirements. When several meters are used on a power supply, an appropriate current rating should be selected. Possibly check for a blown fuse.

Problem: Incorrect reading

Solutions:

Check for any leaks in the installation plumbing.
Ensure the connector pinouts match properly. When interchanging with other manufacturers’ equipment, cables and connectors must be carefully wired for correct pin configurations.
In case of moisture, allow moisture to dry out prior to continuing to use. Verify that the pressure differential across the instrument is sufficient.
Clean/flush filter
Adjust valve if required.

Troubleshooting Gas Mass Flowmeters

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