Digital Display Vacuum Switch

- Jul 16, 2019-

Vacuum switch is a kind of switch to detect the vacuum degree range, also known as vacuum relay. Its function is to automatically turn on and off the control circuit, send out electrical signals and instruct the vacuum adsorption mechanism to operate normally when the vacuum degree produced in the actual work meets the stipulated requirements. It belongs to reliability and safety components.

Vacuum switches are divided into mechanical, semiconductor and air bridge types. Mechanical vacuum switch uses mechanical displacement to determine the change of vacuum pressure, such as diaphragm vacuum switch. Semiconductor vacuum switch uses semiconductor pressure sensor to detect the change of vacuum pressure, and can directly convert the detected pressure signal into electrical signal.

Essential information

Negative pressure switch, also known as vacuum switch, is an intelligent instrument which integrates negative pressure measurement, display and control. It has the characteristics of simple operation, convenient installation, high precision and strong function. The pressure switch has the functions of reverse control, delay control, leakage protection, password protection, one-button error clearing, multiple pressure switching, etc. It can be used to measure various vacuum degrees, and can be used in conjunction with various vacuum pumps.

Vacuum switch is a pressure protection automatic controller used in vacuum system. When the vacuum pressure in the system is greater than the set point, the controller will automatically cut off the circuit and send out signals to ensure the normal operation of the system. When the pressure in the system is higher or lower than the safety pressure, the pressure sensor in the controller acts immediately to turn the contacts in the controller on or off, and the equipment stops working. When the pressure in the system returns to the safety pressure range of the equipment, the pressure sensor in the controller is reset immediately, so that the contacts in the controller can be restored. Connect or disconnect, and the equipment will work normally at this time.

Switch application


It is widely used in various industrial automatic control environments, including petroleum pipeline, water conservancy and hydropower, railway transportation, intelligent building, production automatic control, aerospace, military, petrochemical, oil well, electric power, ships, machine tools, pipeline air supply, boiler negative pressure and many other industries.

Mainly used in metallurgy, chemical industry, petroleum, steel, machinery, refrigeration equipment, refrigeration equipment, pump pressure control, low water level protection pressure control, gas, steam, water, oil and other liquid pressure equipment in power plant, cement, food, shipping and other industries, and other industrial equipment for pressure monitoring in the implementation of supporting agencies. Alarm, interlock protection, realize two-position automatic control.

measuring principle


When the pressure in the system is higher or lower than the rated safety pressure, the disc in the inductor moves instantaneously, and the switch connector is connected or disconnected by connecting the guide rod. When the pressure drops to or rises to the rated recovery value, the disc is instantaneously reset, the switch is automatically reset, or simply when the measured pressure exceeds the rated value, the bullet. The free end of the sex element produces displacement, which directly or after comparison drives the switch element, changes the on-off state of the switch element, and achieves the purpose of controlling the measured pressure. The elastic elements used in pressure switch are single coil spring tube, diaphragm, diaphragm box and bellows.

main features

1. Adopt British pipe threaded quick joint or copper pipe welded installation structure, which is flexible in installation and convenient in use, and does not need special installation and fixing.

2. Inserted wire connection can be selected by users at will.

3. Sealed stainless steel inductor is safe and reliable.

4. The pressure range can be manufactured according to any pressure value selected by the user.

Pressure switches can be divided into mechanical and electronic types. Mechanical pressure switches can be divided into many kinds, and electronic pressure switches can also be divided into many kinds.

Switching function


1. It can stop the upper limit and start the lower limit; (It can also reverse control)

2. Start-up delay can be set to prevent damage caused by frequent start-up of motors.

3. Switching of KPA, BAR and PSI pressure units;

4. One-click Zero Clearing Function

5. It has the function of pipeline leakage protection.

6. Low power consumption, no more than 0.5W

7. Seismic resistance, strong anti-interference, fast response, stable performance.

technical parameter


Pressure regulation range: -0.1-0 Mpa

2. Pressure difference: <0.02MPa

3. Ambient temperature - 20-50 C

4. Medium Temperature-25-120 C

5. Contact Load of Pressure Controller A.C. 220V, 16A

6. Instantaneous current: 96A, 220V D.C.110V, 24A

7. Instantaneous current: 144A, 110V

8. Pressure Controller Connection Standard Connection Mode:

Maintenance methods

1. Before the digital pressure switch is put into use, it is better for users to check whether all parts of the digital pressure switch are in good condition before putting it into use.

2. Proper setting of digital pressure switch, all parameters should be set in the rated range of digital pressure switch, and must not overload, otherwise the service life of digital pressure switch will be affected.

3. In the measurement process of digital pressure switch, it is better to have a special person responsible for observation to avoid unexpected situations in the operation process.

4. Every time the digital display pressure switch is used, its internal components should be cleaned up to prevent the measured medium remaining in it. In addition, in order to protect the display screen of the digital display pressure switch, besides regular wiping, it is better to wrap the display screen with a clean bag to prevent the invasion of impurities such as dust.

5. Perform periodic performance testing of digital pressure switch to prevent its components from aging with the cumulative application and bring some influence to the measurement process.