Qin Sun's Mask Breathing Resistance Testing Machine adopts microcomputer control system and is equipped with computer automatic control device. During the operation, the mask is put on the die, and the screen is started with one button, so no manual intervention is needed during the test.
Test operation steps:
1. power-on preparation
Before turning on the host power supply, make sure that the power supply is AC 220V, 50Hz, and the fluctuation range of power supply voltage is not more than 7%. Turn on the power supply, welcome the interface, and power on the instrument for preheating in the standard test environment for at least 30 minutes. If the preheating time is less than 30 minutes, the test results will be affected.
2. Sample preparation
Make a certain number of samples to be tested with reference to the introduction in "Sample Preparation". The number of samples shall generally not be less than 5. Visual inspection of the sample, the sample should have no obvious defects.
3. Carry out tests
(1) set time and test flow;
(2) Wear the sample to be tested on the test head die, and adjust the wearing position of the mask and the tightness of the head to ensure the tight fit between the mask and the test head die. In the test process, take appropriate measures to avoid sample adsorption at the mouth of respiratory pipeline;
(3) Click the test to start the test;
(4) After the test is finished, the system automatically judges the test result, and the test result shows qualified/unqualified; Remarks: The standard stipulates that the inhalation resistance of the mask is ≤175Pa when the gas flow rate is 85L/min; Expiratory resistance ≤145Pa.
4. Test the next group of samples. If it is necessary to continue the test, repeat the above test steps.
5. After the test, click the "Back button" to return to the main interface. Turn off the power and air supply of the equipment and cover it with dust cloth. Dust cloth should be kept clean and tidy without dust.