Pressure sensors and liquid level sensors are two types of sensors that we often use, so what are the direct differences and connections between the two?
Firstly, the measurement principles of pressure sensors and liquid level sensors are similar, both of which utilize the formula for the pressure on the liquid surface of the sensor when it is applied to a certain depth of the measured liquid: Ρ=ρ. g. In the H+Po equation, P is the pressure exerted on the liquid level gauge towards the liquid level ρ The density of the measured liquid g is the acceleration of gravity (according to 9.8015 during debugging) Po is the atmospheric pressure on the liquid surface H is the depth of the sensor's liquid input. At the same time, the pressure of the liquid is introduced into the positive pressure chamber of the sensor through conductive stainless steel, 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. g. H, obviously, by measuring the pressure P, the liquid level depth can be obtained. The output of the pressure sensor is pressure P, while the output of the liquid level sensor is depth H. The typical application product TV815 input static pressure liquid level gauge utilizes this principle.
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. Liquid level sensors are generally divided into float type liquid level transmitters, float type liquid level transmitters, and static pressure type liquid level transmitters.
Finally, the liquid level sensor can be said to be an extension of the function of the pressure sensor. In many cases, with minor changes, liquid level sensors and pressure sensors can be interchangeable.