In addition to human factors in the use of the balance, the following eight environmental factors will also affect its weighing accuracy, which requires special attention.
The following is a summary of the common problems in the use of balances, so that you can stay away from weighing minefields and easily deal with accurate weighing and annoyance.
1, air flow factors <br>solution
- avoid air flow
- use a windshield
- use grid weighing
2, temperature difference factor <br> solution
- Let the balance stabilize in the laboratory for a while
- Place the sample near the balance
3, vibration factor <br> solution
- Smooth experimental location
- Use a stable marble test bench
4, static factors <br> solution
- Use static destaticizer to eliminate static electricity
5, volatile and resurgence factors <br>solution
- closed sample tray
- fast reading
6, heat radiation factors <br>solution
- Avoid heat sources
- wearing a lab coat
7, magnetic field factors <br> solution
- Avoid materials that are easily magnetized (steel, iron)
- placing non-magnetic articles between the sample and the weighing pan
- If the accuracy is guaranteed, the balance using the strain gauge sensor
8, air buoyancy factor <br> solution
- Calculate the influence of buoyancy using the buoyancy compensation formula
Finally, Xiaobian knocks on the blackboard and gives you some suggestions for placing the balance:
- The balance should be placed in the laboratory away from the corners of windows, doors, air conditioners, heaters, motors, fans, etc.;
- The test table requires placement level, and a marble test bench is recommended;
- The ambient temperature is controlled at a constant value and the humidity is controlled above RH40%;
- Ensure sufficient time for preheating before the start of the experiment, preheating the balance of ten thousand points for more than 1 hour; preheating the balance of 100,000 points for more than 4 hours or continuous power;
- It is recommended to place the sample near the balance. If it is taken out of the refrigerator, please take a quick reading or leave it for a while before weighing.
I hope that these small Tips can help you better use the electronic balance.
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