Capacitance Level Transmitter

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

instruments.

It must be ensured that the probe is parallel to the tank wall throughout it's length.