A capacitance is formed between the probe and the vessel wall
.As the level of the measuring medium rises or falls capacitance
between the probe and vessel wall changes proportionately. A
high frequency sine wave is applied between the probe and
tank wall. A change of medium level will induce a change in the
current of the applied sine wave.
Head mounted electronics converts the capacitance variation to 4-20mA signal for long distance
transmission. It is provided with trimpots for SPAN and ZERO adjustments. With no moving parts
it is free from wear and tear, rugged and robust in construction. No dead zone like float based
It must be ensured that the probe is parallel to the tank wall throughout it's length.