Differential Pressure Monitoring Process (CAV Supply and Exhaust)：

The differential pressure sensor continuously measures the pressure difference between the patient room and the buffer room, the buffer room and the corridor, and displays the differential pressure measured by the sensor to display the negative pressure on the digital display panel of the ward monitor to realize the function of monitoring the differential pressure;

Audible and visual alarms for unsafe conditions, improving the safety and intelligence of the system.

Differential pressure control process  (CAV supply and exhaust):

The controller continuously measures and controls the pressure difference between the patient room and the buffer room (corridor) through the pressure difference sensor.

If the pressure difference in the ward becomes smaller, the controller will quickly adjust (open) the variable air volume exhaust valve of the ward until the negative pressure in the ward reaches the set value.

If the negative pressure in the ward increases, the controller will adjust (close small) the variable air volume exhaust valve of the ward until the negative pressure in the ward reaches the set value.