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How to choose the liquid level sensor sensitivity

by:KAIDI     2020-09-29
Takeaway: the sensitivity of the sensor is a direction. When the measurement is a single vector, and the direction the demand is higher, should choose other small sensor sensitivity; If the measurement is a multi-dimensional vector, cross sensitivity requires sensor as small as possible. Usually in liquid level sensor in the linear range, hope that the sensitivity of the sensor, the higher the better. Because only high sensitivity, and the corresponding value of the output signal is measured change to bigger, is advantageous to the signal processing. But note that the sensor is of high sensitivity, has nothing to do with the measured outside noise also is easy to mix, will also be amplified system amplifier, affect measurement accuracy. Require sensor itself, therefore, should have high signal-to-noise ratio, to minimize the introduction from outside interference signal. The sensitivity of the sensor is a direction. When the measurement is a single vector, and the direction the demand is higher, should choose other small sensor sensitivity; If the measurement is a multi-dimensional vector, cross sensitivity requires sensor as small as possible. ( 1) Inhomogeneous and change of physical parameters. If you don't consider the temperature of the liquid on the lower inhomogeneity, density is consistent, can be thought of by the volume and the weight is very easy to calculate. But large container liquid level sensor may appear around the measured medium temperature, density and viscosity of physical quantities such as uneven phenomenon, and may change with time, temperature, etc, cause measurement error. ( 2) Liquid level. Liquid level, liquid level is horizontal, so in addition to using the wall as electrode capacitance level meter, the general level gauge has asked to the installation height, only can choose any level in the installation site. Ideal liquid surface is the surface of a rule, but when the material flow into the flow, there will be waves, or measured liquid boiling may occur in the process of production, foaming, or on the surface of the phenomenon of suspended solids, liquid surface is uneven. ( 3) A special case. May have a high temperature and high pressure, liquid level sensor container or liquid viscosity is very big, or contains a lot of impurities suspended solids, etc. , adverse effects on the measurement.
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