The working principle of the pressure sensor is that there is a sliding resistor in it, which uses the oil pressure to push the potentiometer of the sliding resistor to move, change the current of the oil pressure gauge, and change the position of the pointer. When the engine temperature is high, it is easy to produce sludge, so it is necessary to pay attention to the maintenance of the engine and the choice of oil. It makes sense to choose high-quality engine oil. Why high-quality engine oil, such as Shell, pays great attention to the cleaning ability of the product. Because oil is related to all aspects of engine lubrication, reduction of wear, cooling and sealing, poor clean oil often cannot prevent the accumulation of carbon deposits. The accumulation of carbon deposits inside the engine will accelerate the wear of cylinder liners, pistons and piston rings. Cause more serious damage to the engine.
There are many types of sensors. Pressure sensors are a common type of sensor in life. What is the working principle of pressure sensors? China Sensor Trading Network pointed out that the pressure sensor is the most commonly used sensor in industrial practice, and it is widely used in various industrial automation environments. The pressure sensor is disassembled and analyzed below.
The measuring range of the diaphragm intelligent pressure sensor is twice that of the inductive sensor. It can not only detect metal targets, but also detect dielectric materials such as paper, glass, wood, and plastic, and even through walls or paper shells. Since the human body is equivalent to an electrical conductor at low frequencies, there are also tremor measurements and anti-theft alarms for people.
When measuring the strain of a component, you can stick the strain gauge directly on the component, but if you want to measure force, pressure, acceleration and other signals, you should first convert these physical quantities into strain, and then use the strain gauge to measure, which is more than direct measurement. A conversion process is completed. The original part that completes this conversion process is usually called an elastic original part. Therefore, a strain sensor is usually composed of an elastic sensitive original part and a strain gauge.
The elastic sensitive element is the core component of the sensor, and the elastic element is required to have high elastic energy storage, which is usually expressed as the ability of an elastic material to store deformation work without permanent deformation. The pressure sensor has good mechanical processing and heat treatment performance, and has strong compressive strength. Due to characteristics such as low temperature influence, the correct selection of elastic sensitive components and strain gauge bridges is an important way to improve strain sensors:
1. The measuring range has high optical accuracy. The force sensor can measure the force of 0.01--1000000N, and the accuracy can reach above 0.05% FS; the pressure sensor can measure the pressure of 0.1-1000000, and the accuracy can reach 0.1% FS.
2. Stable and reliable performance, long service life, such as weighing mechanical lever scale, due to the friction and deformation of the lever, knife edge and other parts, it is quite difficult to maintain its accuracy for a long time. It is made of resistance strain type load cell. Electronic pumps, truck scales, railroad scales, etc., can work stably for a long time under harsh environmental conditions.
3. Excellent frequency response characteristics. Pressure sensors generally have a response time of 0.01MS for resistance strain gauges, and semiconductor strain gauges can reach 0.001MS. If measures can be taken on the elastic components, the strain sensors composed of them can measure dynamic processes of tens of kilohertz or even hundreds of kilohertz.