﻿ Difference between Pressure Transducer and Liquid Level Transducer - Feejoy Technology (ShangHai) Co., Ltd.
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# Difference between Pressure Transducer and Liquid Level Transducer

Pressure transducer and liquid level transducer are two types of transducers that we often use, but few people know their direct connection and difference. Only by understanding the difference between pressure transducer and liquid level transducer can you better choose the type you need.

## 1. The measuring principle of pressure transducer and liquid level transducer

The measuring principle of the pressure transducer and the liquid level transducer is similar, they are both used when the transducer is put into a certain depth in the measured liquid. The formula for the pressure on the front surface of the transducer is: Ρ=ρ.g.H + P0, in which P is the pressure on the liquid surface of the liquid level gauge. ρ is the density of the liquid being measured. g stands for the acceleration of gravity (according to 9.8015 when debugging). P0 is the atmospheric pressure on the liquid surface. H is the depth of the transducer into the liquid. The pressure is introduced into the positive pressure cavity of the transducer, and then the atmospheric pressure P0 on the liquid surface is connected with the negative pressure cavity of the transducer to offset the P0 on the back of the transducer, so that the pressure measured by the transducer is: ρ.g.H. Obviously, you can get the liquid level depth by measuring the pressure P. The pressure transducer output is pressure P, while the liquid level transducer output is depth H.

## 2. The classification of pressure transducer and liquid level transducer

The classification of pressure transducer and liquid level transducer is different. Pressure transducers can generally be divided into strain gauge pressure transducers, ceramic pressure transducers, diffused silicon pressure transducers, sapphire pressure tranducers, and piezoelectric pressure transducers. The liquid level transducer is generally divided into float type liquid level transmitters and static pressure type liquid level transmitters.

## 3. The liquid level transducer can be said to be an extension of the pressure transducer

In many cases, the liquid level transducer and pressure transducer can be used in common with a slight change. With the development of technology and changes in the use environment, the division of labor between pressure transducers and liquid level transducers will become more and more detailed. They will also do their best. As a result, pressure transducers and liquid level transducers have become two different families.