Pressure sensors and liquid level sensors are the two sensors we often use, but few people know what they are directly related to and different from. Only by understanding the difference between the pressure sensor and the level sensor can you better choose the type you need
Pressure sensors and liquid level sensors are the two sensors we often use, but few people know what they are directly related to and different from. Only by understanding the difference between the pressure sensor and the liquid level sensor can you better choose the type you need.
First of all, the measuring principles of the pressure sensor and the liquid level sensor are similar. They all use the pressure formula when the sensor is put into the measured liquid at a certain depth. : P is the pressure on the liquid surface of the liquid level gauge ρ is the measured liquid density g is the acceleration of gravity (according to 9.8015 during commissioning) Po is the atmospheric pressure on the liquid surface H is the depth of the sensor into the liquid at the same time, the liquid is passed through the air-conducting stainless steel The pressure is introduced into the positive pressure chamber of the sensor, and then the atmospheric pressure Po on the liquid surface is connected to the negative pressure chamber of the sensor to offset the Po on the back of the sensor, so that the pressure measured by the sensor is: ρ.gH. , You can get a deep liquid level. Only the output of the pressure sensor is the pressure P, and the output of the level sensor is the depth H.
Secondly, 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, diffused silicon pressure sensors, sapphire pressure sensors, and piezoelectric pressure sensors. The liquid level sensor is generally divided into a floating ball type liquid level transmitter, a float type liquid level transmitter, and a static pressure type liquid level transmitter.
Finally, the liquid level sensor can be said to be an extension of the pressure sensor function. In many cases, with a slight change, the liquid level sensor and pressure sensor can be used universally. With the development of technology and changes in the use environment, the division of labor between pressure sensors and level sensors will become more and more detailed. They will also do their best. Thereby, the pressure sensor and the liquid level sensor become two different big families.