The application of liquid level sensor selection

1, according to the object and the measurement environment determine the type of sensor

to a specific measurement, the first thing to consider what liquid level sensor principle of the sensor, the need to analyze various factors to determine. Because, although measuring the same quantity, also have a variety of available for selection principle of the sensor, the principle of a kind of sensor is more appropriate, need according to the characteristics of the measured and sensors use conditions to consider the following specific issues: the size of the range; The measured position of sensor volume requirements; For contact or non-contact measurement mode; Signal method, the derivation of the cable or contact measurement; The source of the sensor, it is imported or domestic, the price can accept, or developing itself.

2, frequency response characteristics of the liquid level sensor determines the frequency range of the measured frequency response characteristics, must maintain a undistorted measurement frequency range of the permit conditions, in fact, the response of the sensor there is always a certain delay, hope that the shorter the delay, the better, high frequency response of the sensor, the measured signal frequency range is wide, but due to the influence of the structural characteristics, mechanical system of the large inertia, due to low frequency of the sensor measured signal frequency is low, in the dynamic measurement, should according to the characteristics of the signal ( The steady state, random, etc. ) The response characteristics, lest produce far error.

3,

normally, the choice of sensitivity in the linear range of liquid level sensor, hope that the sensitivity of the sensor, the higher the better, because only high sensitivity, and by measuring changes in the corresponding output signal is larger for 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 the measuring accuracy, so the sensor itself has the very high manic ratio, decrease as far as possible from the outside into the factory 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 be measured is a multi-dimensional vector, insist on cross sensitivity of the sensor as small as possible.