The particle size measuring tube is a measuring tool for measuring the performance of the wet magnetic powder suspension in the magnetic powder standard of the Ministry of Railways and the magnetic powder standard of the Ministry of Machinery. The tool has a length of 400mm, a glass tube with an inner diameter of 10 +/- 1mm, and the tube has a scale of 300mm, 10mm per grid.
Instructions:
1. Fix the particle size measuring tube vertically on a bracket and fix it with clips;
2. Weigh out 2g as a magnetized magnetic powder with an industrial balance.
3. Pour magnetic powder and absolute ethanol into the glass tube and shake vigorously until it is evenly mixed.
4. Inject absolute ethanol into the glass tube to a height of 300mm.
5. Gamble on the lid and invert the glass tube repeatedly to mix the magnetic powder and absolute ethanol evenly.
6. After stopping the inversion, quickly fix the glass tube upright on the clamp, let it stand for 3 minutes, and read the height of the magnetic column at the obvious boundary.
7. Test three times according to the above steps, and replace with new magnetic powder each time. Take the average of three times as the final result.
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