Water Level Measurement Using Capacitive Sensor

It has to be as high as the maximum max allowed liquid level.

Water level measurement using capacitive sensor.

Level the capacitance of the level electrode is proportional to the liquid height hw. With a capacitive sensing based solu tion no moving parts or sensors need to be in direct contact with the liquid to be measured. This sensor comprises a printed circuit board pcb with configuration of two interpenetrating comb electrodes. Performing system calibration using labview software can help achieve higher accuracy.

For d h 1. 5 v pp3. The space between the tubes is the dielectric. From this equation the measured capacitive is proportional to the length submerged into water as the approximate capacitance per length of track for a coplanar sensor remains constant.

In this research water level sensor based on capacitive principal created using two copper plates with height h width b and distance l between two plates respectively 0 040 m 0 015 m and 0 010 m. Instead the liquid level is measured with a non contact capacitive sensor deployed externally to the reservoir. When the tube starts to fill more and more of the space will be occupied by water. A water level measurement using an interdigital capacitive sensor with low cost low energy good repeatability high linearity and ease of installation is proposed with a support of experimental results.

When the tube is empty the space is occupied by air. It has typically high impedance sensor particularly at low frequencies as clear from the impedance reactance expression for a capacitor. Capacitive sensor for water level detection has been fabricated. Also capacitive sensor is a noncontacting device in the common usage.

In this research water level sensor based on capacitive principal created using two copper plates with height h width b and distance l between two plates respectively 0 040 m 0 015 m. A rod of stainless steel and a polytetrafluoroethylene ptfe insulated wire have been used for electrode of capacitive sensor. The capacitive level sensor has the 2 conducting plates in the form of 2 electrically isolated aluminium tubes a smaller tube in a larger tube. Liquid level sensing is based on the theory of a ratiometric measurement using three sensors as shown in figure 2.

1 have described the design and implementation of a liquid level measurement system based on a remote grounded capacitive sensor.