Low cost non contact capacitive gauge glass level transmitter suitable for remote measurement & control

The gauge glass is simple way to measure the liquid level in water reservoir and is classified as primary measurement system of liquid level. This work demonstrated design and development of electrically modified capacitive non-contact level transmitter suitable for low cost industrial and home application. The error involves in the measurement due to fringe capacitances eliminated in the design and achieved stable and accurate results. The transmitter is built with analog PIDD^-1 controller with improved design and the entire unit developed is a compact gauge glass conductive liquid level indicator cum controller.