pc based water level measurement

[f2003588]

level measurement circuit

hi every one i am doing a project related to water level measurement n control so tht water can be pumped out for irrigation from wells..i have to control n measure the level using PC (interfacing to 8085 mup)..can this be done using capacitance as a parameter???? r suggest some ideas r any ieee papers

 

[banjo]

water level measurement circuit

Are you trying to measure the water level in a tank or the water level in the well?

In a water tank, the usual method is to drill two holes in the tank. One at the top and another at the bottom. The holes then connect to plumping elbows. Between the elbow is a piece of plastic hose is connected. (If you use clear tubing, you can see the water level ) To sense this level electrically, copper foil is attached to the tubing in two sections to form a long capacitor. The inside of the tube becomes the dielectric within the capacitor. The dielectric of water is much different that air, so the total capacitance changes with the air level.

For water level in a well, I would suggest trying to do it with a ultrasonic measurement. If you fix a measurement point inside the well and point a ultrasonic sensor down as the water and determine the distance from the sensor point to the top of the water. The greater the distance, the less water in the well.

The magazine, Circuit Cellar, as done several projects on this topic in the past. Do a search on their web site, www.circellar.com

I have purposely not mentioned the resistance method. This involves pulling electrodes in the water and making resistance measurements. While it works, it requires lots of maintanence due to corrosion.

 

[ttrr2000]

project on water level measurements

TDS2000

 

[tanuki]

using capacitance to measure level in tank

Depending on the depth of the well or tank and noise sources either ultrasonic echo or magnetostrictive methods may work. For deep wells laser ranging can be used.

http://www.prowave.com.tw/english/index.htm

http://www.acam.de/index.php?id=55&L=0


Good luck designing what you want.