Treatment of the decline in the accuracy of vacuum pressure switches

The decline in the accuracy of vacuum pressure switches will affect the normal operation of the equipment and the performance of the system. The following introduces the treatment methods from aspects such as fault detection, component handling, calibration adjustment, environmental optimization and daily maintenance:

Troubleshooting

Check the stability of the power supply: Fluctuations in the power supply voltage may affect the normal operation of the electronic components inside the vacuum pressure switch, thereby leading to a decrease in accuracy. Use a multimeter to measure the supply voltage of the switch to see if it is within the specified range. If the voltage is unstable, for instance, if it is too high or too low, it may cause abnormal operation of components such as sensors and circuit boards inside the switch, affecting the accuracy of pressure measurement.

Troubleshoot external interference: Electromagnetic interference, mechanical vibration and other factors in the surrounding environment may all interfere with the accuracy of vacuum pressure switches. For instance, the electromagnetic fields generated by the operation of high-power motors, transformers and other equipment nearby may interfere with the signal transmission and processing of the switch. Meanwhile, excessive mechanical vibration may also cause the internal components of the switch to loosen or shift, affecting its normal operation. The existence of external interference problems can be determined by temporarily moving the switch to an environment with less interference for testing and observing whether the accuracy returns to normal.

Component processing

Clean or replace the pressure sensing element: The pressure sensing element is the core component of the vacuum pressure switch. If its surface is covered with dust, oil stains and other impurities, or if it ages or wears out due to long-term use, it will lead to a decrease in accuracy. For slightly contaminated sensing elements, a clean cotton swab dipped in an appropriate amount of anhydrous alcohol can be used to gently wipe them to remove surface dirt. However, if the sensing element has severely aged or been damaged, it is necessary to replace it with a new one in a timely manner to ensure that it can accurately sense pressure changes.

Inspect and repair the sealing components: Damage to the sealing components can cause external air or impurities to enter the switch interior, affecting the internal pressure environment and thereby reducing accuracy. Check whether the sealing rings, gaskets and other components of the switch have problems such as aging, deformation or damage. If problems with the sealing components are found, they can be repaired or replaced according to the specific circumstances. For instance, for slightly aged sealing rings, one can try applying some sealant for repair. For severely damaged sealing components, new sealing parts need to be directly replaced to ensure the sealing performance inside the switch.

Calibration adjustment

Calibration with standard equipment: Use a high-precision standard pressure gauge to calibrate the vacuum pressure switch. Connect the switch to the standard pressure gauge, apply a series of known standard pressure values, and record the operating pressure and reset pressure of the switch. Then, based on the reading of the standard pressure gauge, adjust the calibration parameters of the switch to make its measured value consistent with the standard value. During the calibration process, the operating procedures must be strictly followed to ensure the accuracy of the calibration.

Adjusting the hysteresis setting: An unreasonable hysteresis setting may also lead to a decrease in the switch accuracy. Hysteresis refers to the difference between the operating pressure and the reset pressure of a switch. If the hysteresis is set too large or too small, it will affect the response sensitivity and stability of the switch. According to the actual usage requirements and system demands, adjust the hysteresis setting of the switch to keep it within an appropriate range. Generally speaking, the hysteresis setting should not only prevent the switch from frequently operating due to minor pressure fluctuations, but also ensure a timely response when the pressure reaches the set value.

Environmental optimization

Control the ambient temperature: Temperature changes can affect the performance of the internal components of the vacuum pressure switch, leading to a decrease in accuracy. Try to install the switch in an environment with stable temperature, avoiding direct sunlight and the influence of high-temperature heat sources. If the ambient temperature cannot be controlled, it is advisable to consider installing a temperature compensation device to automatically adjust the measurement parameters of the switch according to temperature changes, ensuring its accuracy.

Reduce the impact of humidity: A high-humidity environment may cause the internal components of the switch to become damp, affecting their electrical and mechanical performance. Moisture-proof measures can be taken, such as installing dehumidification equipment and using well-sealed casings, to reduce the impact of environmental humidity on the switch.

Daily maintenance

Regular inspection and cleaning: Establish a regular inspection and maintenance system, and regularly inspect and clean the vacuum pressure switch. Check whether the appearance of the switch is damaged and whether the connection lines are loose, etc. Clean the dust and dirt on the surface of the switch in time to keep it in good working condition.

Record operation data: Record the operation data of the switch, such as pressure value, action frequency, calibration time, etc. By analyzing the operation data, the performance change trend of the switch can be discovered in a timely manner, and measures can be taken in advance for maintenance and adjustment to prevent the further deterioration of the problem of accuracy decline.