Various sensors are used in automobiles, home appliances, and instruments. Pressure sensors, for example, are among the most widely used sensors and are very important components.
A pressure sensor is a device that senses pressure signals and converts them into usable electrical output signals according to certain rules. According to Sensor Experts Network, pressure sensors are among the most commonly used sensors in industrial practice, widely applied in various industrial automation environments, including water conservancy and hydropower, railway transportation, intelligent buildings, production automation, aerospace, military, petrochemicals, oil wells, power, shipbuilding, machine tools, pipelines, and many other industries. Below is a brief introduction to the principles and applications of some commonly used sensors.
Common faults of pressure sensors
The first scenario is that the pressure increases, but the transmitter output doesn't. In this case, first check if the pressure port is leaking or blocked. If not, check the wiring and power supply. If the power supply is normal, apply a simple pressure test to see if the output changes, or check if there is an output at the sensor zero point. If there is no change, the sensor is damaged, which could be due to a faulty instrument or a problem with other parts of the system.
The second scenario involves a situation where the transmitter output remains unchanged under pressure, then suddenly changes upon further pressure, and the zero point of the pressure-releasing transmitter fails to return. This is highly likely due to a problem with the pressure sensor's sealing ring. A common cause is an inappropriate sealing ring size; after tightening the sensor, the ring may be compressed into the sensor's pressure port, blocking the sensor. During pressurization, the pressure medium cannot enter, but under high pressure, it may suddenly force open the sealing ring, causing the pressure sensor to change. The best way to troubleshoot this is to remove the sensor and directly check if the zero point is normal. If the zero point is normal, replace the sealing ring and try again.
The third type is an unstable transmitter output signal. This fault could be due to a problem with the pressure source. The pressure source itself is unstable, which could be caused by weak anti-interference capabilities of the instrument or pressure sensor, severe vibration of the sensor itself, or a sensor malfunction.
The fourth type is a large discrepancy between the transmitter and the pointer-type pressure gauge. This discrepancy is normal; simply confirm the normal deviation range.
