The test device is designed for the purpose of measuring dust and anti - -effective masks for the increase in carbon dioxide concentration, and sends 5 % carbon dioxide to the head using a respiratory mock device that artificially simulates breathing. Comparing the carbon dioxide concentration when masked and when not installed, the carbon dioxide increased on the mask surface. The test platform for masks is connected to the mouth, using a person in accordance with the JIS standard.
Breathing has a mechanism that creates a sine -shaped -shaped intake exhaust from a piston round -trip movement, and has a variable intake and exhaust speed and a single intake and exhaust. A series of operations, from injection of test gas to measurement, and gas recovery, is a device that is composed of a system that can collect test gas in conjunction with the piston movement at the time of measurement. 。
In addition, there is a port of differential pressure measurement in the head, so it is possible to monitor the mask surface in the breath of sine waves.