In our level transmitter, float & guide tube (Stem) assembly in non-magnetic material. Number of closely spaced glass encapsulated reed switches & resistors are placed inside the guide tube. Now when the liquid level goes ups and down in the tank, the float moves on guide tube (stem) actuates a reed switches, through a magnet system within it and develops a proportional voltage. The
operation is similar to a sliding resistance potentiometer. The sensed voltage is fed to the transmitter located in the enclosure for conversion to a signal of 4-20 mA, for use with PLC / DCS or Level Indicating Controllers.
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