Because of the need to control the flow rate 1-5 litres per minute. Therefore, it is necessary to use a flow meter and a pump to control the rate of air flow appropriately. After that. Enter the command to start the work.
The need to control the rate of flow at 1-5 liters per minute, so it requires a flow meter and pump to control the flow of air to the right after entering the command to start.
Due to the need to control the flow rate at the 1-5 liters per minute. Therefore need to use and flow meter pump controlled air flow rate to the right. After entering the command to start the work.