The air bubble in a balance is important because it indicates whether the balance is level. An unlevel balance can produce incorrect weight readings.
To check the level of an electronic balance, you can consult the level indicator. The balance is leveled when the air bubble is within the circle on the indicator, and ideally, when it is perfectly centered in the middle of the circle.
How to adjust the air bubble?
- Select the most suitable location for your electronic balance.Ensure it is level
- Adjust the balance leveling feet until the air bubble in the indicator is in the center
- Rotate the two leveling screws at the rear base of the balance
- After adjustment, try not to move the balance, otherwise the level bubble may shift and need to be adjusted again.
Other factors that can affect the accuracy of a balance:
- Changes in air pressure and air movement caused by the opening of doors, people passing by, air conditioning.
- Warming up the inside of the balance with your body heat.
- Keeping your hands out of the case as much as possible.
- Keeping the balance windows closed while working.
The Do's and Don'ts of Laboratory Balances:
- DON'T: Install a balance just anywhere.
- DO: Select a stable place to install your balance.
- DON'T: Weigh a sample in a container of inappropriate size or material.
- DO: Weigh samples in a suitable container of minimal size.
- DON'T: Handle weighing containers or test weights with your bare hands.
- DO: Handle containers and test weights with clean gloves or forceps.
- DON'T: Use a balance immediately after turning it on.
- DO: Allow sufficient time for the balance to warm up before using.
- DON'T: Overload the balance.
- DO: Take care to avoid damage to the balance.
- DON'T: Ignore sample properties when performing weighing measurements.
- DO: Optimize weighing procedures to account for sample properties.
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Resource Person: Mohamed Ezz
