Submersible type level transmitter, also known as hydrostatic pressure level sensor. It is an extension and development of advanced pressure transmitter technology in different applications. This type of transmitter is designed base on the principle of linear relationship between the measured hydrostatic pressure and the height of the liquid. It uses the piezoresistive effect of diffused silicon or ceramic sensors or capacitive pressure sensor converts static pressure into electrical signal. Through temperature compensation and linear correction, output signal will then be converted to 4-20 milliampere or 0-5 volt. In field installation, the sensor section can be directly put into the testing medium and the transmitter section of the instrument can be fixed by flange or bracket connection.
Submersible type level transmitter can be used to measure height and pressure of water, oil and low concentrated testing medium. This transmitter features:
There are so many factors need to be taken into consideration when choosing the most suitable submersible type level transmitter for specific application. The following factors need to be specially paid attention to:
In addition, there is a very special situation where measurement requires use of differential pressure level transmitter. Differential pressure level transmitter is often installed at the bottom of the liquid tank. Using gauge pressure signal reflects liquid level. This situation is often seen in process of pharmaceutical, food & beverage and chemical industries. In these processes, tanks are often under pressure where submersible type level transmitters are not able to work.
In conclusion, submersible type level transmitter as a common type of liquid level transmitter is widely used across varies industries. To know how to choose the most suitable instruments with best performance is essential for operators.
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