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Pressure sensors and liquid level sensors are common sensors that we usually have. What are the necessary connections and differences between these two sensors? Only by fully understanding the relationship between them can we better choose our own type of sensors. .
First of all, the measurement principle of the pressure sensor and the liquid level sensor are similar. When the sensor is put into a certain depth in the liquid to be measured, the pressure formula of the sensor liquid receiving surface is: Ρ=Ï.g.H+Po In the formula: P is the pressure received by the level gauge on the liquid surface Ï is the density of the measured liquid g is the gravitational acceleration (according to 9.8015 when debugging) Po is the atmospheric pressure on the liquid surface H is the depth of the sensor into the liquid, meanwhile, through the air guide stainless steel The liquid pressure is introduced into the positive pressure chamber of the sensor, and then the atmospheric pressure Po on the liquid surface is connected with the negative pressure chamber of the sensor to cancel the Po on the back of the sensor, so that the pressure measured by the sensor is: Ï.gH, apparently, by measuring Pressure P, can get deep liquid level. Only the pressure sensor output is pressure P, and the level sensor output is depth H.
Second, the classification of pressure sensors and liquid level sensors is different. Pressure sensors can generally be divided into strain gauge pressure sensors, ceramic pressure sensors, diffusion silicon pressure sensors, sapphire pressure sensors, piezoelectric pressure sensors. The level sensor is generally divided into floating ball level transmitter, buoyancy level transmitter, static pressure level transmitter.
Finally, the level sensor can be said to be an extension of the pressure sensor function. In many cases, the level sensor and pressure sensor can be used as long as there is a slight change. With the development of technology and changes in the use of the environment, the division of labor of pressure sensors and liquid level sensors will become more and more detailed. They will also do their best. The pressure sensor and the liquid level sensor thus become two different large families.