A vacuum controller is a control device used to maintain the vacuum level in a specific space. It consists of components such as pressure sensors, solenoid valves, and valves, and is widely used in laboratory experiments, concentration distillation, clean room environment measurement, and industrial production processes.

1. Pressure monitoring: The vacuum controller detects the absolute pressure of the system in real-time through built-in high-precision ceramic/silicon semiconductor sensors or vacuum gauges. These sensors convert physical pressure signals into electrical signals, which are then digitally processed by a 24 bit AD conversion chip to ensure high-precision pressure readings.

2. Data processing and decision-making: The controller uses the eight point least squares method to fit and process non-linear sensor data, improving pressure detection accuracy. Subsequently, the control unit compares the measured pressure with the set value, generates adjustment instructions through artificial intelligence PID algorithm, and outputs a 16 bit DA signal to drive the actuator.

3. Response of the actuator: According to the instructions of the controller, the micrometer level variable leakage valve or electric needle valve group responds quickly (response time<50ms) by adjusting the gas flow rate to correct pressure deviation. In the low vacuum range (1Pa~1000Pa), the main function is to adjust the opening of the intake needle valve to maintain pressure balance; In the high vacuum section (<1Pa), switch to the exhaust needle valve to control the vacuum degree.

4. Closed loop operation: The entire system forms a closed loop, maintaining the set vacuum degree by dynamically balancing the inflow and outflow of gas. In addition, the system also has multi-level safety protection mechanisms such as overvoltage protection and redundant design, ensuring timely cut-off of gas flow and prevention of gas backflow in case of abnormal high pressure.

Precautions for using vacuum controller:

1. Installation location: Keep away from vibration and magnetic field interference, ensure correct wiring of power and signal lines, and pay attention to waterproofing and dust prevention.

2. Connection requirements: Ensure the sealing of the interface to prevent air leakage; Pay attention to the tightness of the interface to avoid affecting the measurement and control of vacuum degree.

3. Calibration operation: Regularly calibrate, connect the vacuum gauge controller to the vacuum standard gauge, and calibrate according to the reading of the standard gauge to ensure measurement accuracy.

4. Safe operation: Avoid exceeding the system's capabilities to prevent danger to personnel and equipment. During use, do not use any external force to collide with the vacuum arc extinguishing chamber, and it is strictly prohibited to strike or tap with hands. Do not apply force when moving or maintaining.

5. Daily maintenance: Regularly clean the surface and interface of the vacuum gauge controller to ensure the sealing of the interface; Regularly check the wiring of power and signal lines to ensure their firmness.