Working principle of pressure controller: the working medium (oil, gas, water) acts directly on the metal diaphragm, and the pressure of the working medium is reflected by the deformation of the metal diaphragm, and the detection signal or control signal is output at the same time.

When the controller products are manufactured, each product has its specific working pressure range (range). In this range, the customer can preset the pressure value that needs to be switched, which is also called the set point of the pressure switch. After connecting to the system, when the pressure of the measured medium is greater than (less than) the set point, the sensor generates a step signal, which triggers the micro switch inside the controller to open (close) the system loop. The controller is usually equipped with a SPDT type micro switch. Each SPDT Switch can be set to the normally closed or normally open state. When it is set to the normally open state, when the micro switch acts, the system loop will be closed. The normally closed state is to disconnect the system circuit.

The negative pressure system controller is mainly used to monitor the air pressure in the negative pressure ambulance; The air pressure inside the negative pressure ambulance is usually lower than that outside, and the negative pressure controller monitors whether the negative pressure value is normal in real time; The device is provided with a high and low pressure alarm, a disinfection indicator, a power switch and a negative pressure controller; Among them, the air pressure in the negative pressure ambulance box is higher or lower than the set range, which will trigger the alarm function to send an alarm reminder, thus protecting the safety of medical personnel to the maximum extent; The disinfection indicator light has the function of disinfection, and it plays the role of disinfection and sterilization at the same time.

The research and development of negative pressure system controller has a new breakthrough in the field of negative pressure system; After many tests, all data are normal. At present, the negative pressure controller in emergency production, put into use faster in order to better ensure the safety of patients and medical personnel.