Key points for installing fixed vacuum pressure switches

The key points of installing fixed vacuum pressure switches are crucial for ensuring their stable operation and precise monitoring. The following are the key links that need to be focused on during the specific installation process:

1. Installation location selection

Close to the monitoring point: The switch should be installed as close as possible to the pressure monitoring point of the vacuum system to reduce lag and error during the pressure transmission process. For instance, when installing on vacuum pipelines, straight pipe sections should be selected to avoid installation at elbows, valves or branches.

Avoid interference sources: The installation location should be far away from vibration sources, heat sources and strong electromagnetic fields to prevent external factors from interfering with the normal operation of the switch. For example, avoid installing switches near motors, transformers or high-temperature equipment.

Easy to maintain: The installation location should reserve sufficient operating space to facilitate subsequent debugging, calibration and maintenance work. For example, a distance of at least 30 centimeters should be maintained around the switch to facilitate disassembly and wiring.

2. Installation direction and Angle

Vertical installation preferred: Fixed vacuum pressure switches are typically designed for vertical installation to ensure that the internal pressure-sensing elements (such as bellows or diaphragms) can move freely and are not affected by gravity. If it must be installed horizontally, it is necessary to confirm whether the switch is supported and adjust the set value to compensate for the gravitational effect.

Avoid tilting: Installation Angle deviations may cause uneven force distribution on the pressure-sensing element, affecting measurement accuracy. For example, when the tilt Angle exceeds 5°, it may be necessary to recalibrate the set value of the switch.

3. Pipe connection and sealing

Select the appropriate connection method: Based on the system pressure and medium characteristics, choose the appropriate connection method, such as threaded connection, flange connection or ferrule connection. For example, for low-voltage systems, threaded connections can be adopted; For high-pressure or corrosive media, it is recommended to use flange connections.

Ensure sealing: Sealing gaskets or sealants should be used at the connection points to prevent medium leakage. For instance, in a vacuum system, vacuum-specific sealing materials such as fluororubber or metal gaskets should be selected.

Avoid stress transmission: When connecting pipes, avoid applying additional mechanical stress to the switch to prevent deformation or damage to the switch. For example, flexible joints or corrugated pipes are used to compensate for the thermal expansion and contraction of pipelines.

4. Electrical wiring and protection

Correct wiring: According to the wiring diagram of the switch, correctly connect the power supply line, signal line and grounding line. For example, ensure that the power supply voltage matches the rated voltage of the switch to avoid overvoltage or undervoltage.

Protection level matching: Select a switch with an appropriate protection level based on the humidity, dust and corrosiveness of the installation environment. For instance, in damp or corrosive environments, switches with a protection rating of IP65 or above should be selected.

Avoid electromagnetic interference: Signal lines should be kept away from strong current lines or high-voltage equipment. Shielded cables should be used when necessary. For example, separate the signal lines from the power lines and keep a distance of at least 10 centimeters between them.

5. Debugging and calibration

Initial Settings: Adjust the set values of the switch (such as start pressure and stop pressure) according to the system requirements. For example, in a vacuum packaging machine, the starting pressure is set at -90 kpa and the stopping pressure at -80 kpa.

Functional test: After installation is completed, conduct a functional test to verify whether the switch operates accurately under the set pressure. For example, by manually adjusting the vacuum degree, observe the on-off state of the switch contacts.

Regular calibration: To ensure long-term stability, it is recommended to calibrate the switch regularly. For example, calibration should be carried out every six months or once a year, and comparisons should be made using a standard pressure gauge.

6. Installation environment requirements

Temperature range: Ensure that the installation environment temperature is within the allowable range of the switch (typically -20℃ to +80℃). For instance, in high-temperature environments, high-temperature resistant models should be selected or additional heat dissipation measures should be added.

Cleanliness: Avoid installing in environments with a lot of dust or particles to prevent dust accumulation inside the switch from affecting its performance. For instance, in the food processing or pharmaceutical industries, dust-proof designed switches should be chosen.

Ventilation conditions: If there are electronic components inside the switch, ensure that the installation location is well-ventilated to avoid overheating. For example, avoid installing the switch in a closed electrical control cabinet.

7. Safety Precautions

Prevent overpressure: In high-pressure systems, safety valves or pressure relief devices should be installed to prevent the pressure from exceeding the pressure resistance range of the switch. For example, install a pressure relief valve at the outlet of the vacuum pump.

Grounding protection: Ensure that the metal casing of the switch is reliably grounded to prevent safety accidents caused by static electricity or leakage. For example, connect the yellow-green two-color grounding wire to the grounding terminal.

Operation training: Installation and maintenance personnel should receive professional training and be familiar with the operation procedures and safety precautions of the switch. For example, during the debugging process, protective gloves and goggles should be worn.

8. Inspection after installation

Visual inspection: Confirm that the switch is undamaged and there is no leakage at the connection points. For example, check whether the sealing gasket is intact and whether the threads are tightened.

Action test: By gradually changing the system pressure, verify whether the start and stop actions of the switch conform to the set values. For example, record the action time of the switch at -90 kpa and -80 kpa.

Record archiving: Archive the installation parameters, debugging data and maintenance records to facilitate subsequent traceability and management. For example, record the model, set value, installation date and calibration cycle of the switch.

By implementing the above installation points, it can be ensured that the fixed vacuum pressure switch operates stably and accurately in the vacuum system, thereby guaranteeing the safety and reliability of the entire system.