（China）YYP121 Paper Permeability Tester

III.The main technical parameters and working conditions:

1. Measuring range: 0-1000ml /min

2. Test area: 10±0.02cm²

3. Test area pressure difference: 1±0.01kPa

4. Measurement accuracy: less than 100mL, volume error is 1 mL, Greater than 100 mL, the volume error is 5 mL.

5. Inner diameter of clip ring: 35.68±0.05mm

6. The concentricity of the center hole of the upper and lower clamping ring is less than 0.05mm

The instrument should be placed on a solid workbench in a clean air environment at room temperature of 20±10℃.

IV. Working principle:

The working principle of the instrument: that is, under the specified conditions, under the unit time and unit pressure difference, the average air flow through the unit area of the paper.