The mask differential pressure tester is a tool for determining the breathability of medical mask materials. The tester measures the differential pressure (DeltaP) required to draw air through the measured surface area at a constant air flow rate, which is used to measure the air exchange pressure of the medical mask material. By providing air intake through the holding sample, the tester can measure the DeltaP via a differential pressure sensor, which is used to determine breathability and comfort using the medical mask material.
Structural features of the mask differential pressure tester.
1、Using a vacuum pump to achieve the power source for the test product;
2, the use of fixtures to achieve the internal and external pressure measurement of the product, built-in differential pressure sensor;
3、The chassis is in the form of an integrated machine with built-in vacuum pump and digital display meter to achieve automatic detection of pressure and automatic display.
Test principle of the mask differential pressure tester.
The tester is mainly used to measure the pressure difference between the two sides of the mask for gas exchange, using a differential pressure sensor to detect the differential pressure value; the flow rate is controlled through a regulating valve. The automatic control system consists of a panel control system, flow rate adjustment system, differential pressure detection system, alarm system, etc. The controls chosen are highly reliable, which can reduce the failure rate of the instrument and improve the test efficiency.
Normally, the better the air permeability of the specimen, the smaller the differential pressure value obtained through the tester; conversely, when the air permeability of the specimen is poor, the differential pressure value obtained through the tester is larger. When using the medical mask gas exchange pressure differential tester for testing, the test data is recorded in real time and the results are averaged M.
In accordance with the requirements of the standard, the test area S=4.9cm2. the differential pressure per unit area is calculated as:DP=M/4.9
According to the pressure difference value obtained under the unit area and the standard requirements of the mask on both sides of the pressure difference △ P = 49 to compare, you can infer whether the specimen to meet the requirements.