Hi Guys!
I want to mesauring fluid level in different cars reservoir. What is the best sensor and technic in this case?
Do the reservoirs have anything in common other than holding fluid?
Paul
I think have not.
So each one will be custom design.
Paul
That's a problem. 
I need universal solution.
Don't we all. A universal solution for a problem with a universe of variations.
Paul
MPX2010DP is able to messaure water level?
No, measures pressure, which will change with air pressure, like when the weather changes or you drive the car up into the mountains.
Paul
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Lps33hw is good for me?
Link to data sheet, please!
Paul
An air pressure sensor will let you measure water pressure at the bottom of a tube if you fill the tube with air. That won't tell you the volume of fluid, just the height of the fluid.
You could use a flow sensor to measure how much fluid has come out, but unless you know the previous volume, that won't give you the volume.
I think most would be satisfied with a float switch to tell you when you are getting close to empty.
If the container was sealed, you could calculate the empty volume with an air pump and how quickly the pressure rises with a given quantity of air injected. If the tank is empty you could tell the full volume.
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We could offer thousands of possibilities, but the OP wants a universal solution. There is NO way to add anything to the washer solution container in my VW Jetta without cutting a hole in the container. The filler is offset from the container about 4 inches and it has a very fine screen to keep trash out while refilling.
I am sure others are even more complex. Besides, the sensor has to be able to handle the alcohol in the solution.
Paul
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The volume of the fluid will good, isn't? I messaure when the reservoir is empty, I note it. Thereafter I messaure when the reservoir is full, I note it too. If I know how many liters the reservoir, I can calculate the level. This method works?
Unfortunately the water in the washer fluid absorbs the air in the tube, such that the level in the tube gradually rises and the reported pressure differential falls.
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Hi,
Are you assuming that the washer reservoir has the same cross-section its entire vertical length?
I think you will find most car manufacturers add the washer resevoir as the last thing, and they are all sorts of shapes.
I have a 2006 Kia RIO, the reservoir is buried behind/beneath the headlight with a pipe, with a kink in it, going to the filler cap above the headlight.
How are you going to get what ever sensor you have into the tank?
Tom... 
I drill a hole in the cap.
Run a piece of tubing to the bottom of the tank ( or connect to tank outlet). Run this into another tank or column at the same level as the washer tank. Fill tubing completely with fluid. Now you can measure level of fluid in external tank/column. Calibration will be needed for every tank, slowly add measured fluid to tank, creating a table of fluid level vs volume.
Use a tiny air pump to re-fill the tube with air before reading.
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Seems like a lot of trouble to solve a "problem" most people consider to be a non-problem. I carry an extra jug of fluid during the winter and refill the reservoir as necessary.
Lets suppose you were able to discover the volume level of fluid in the container. What are you going to do with that information? Are you intending to incorporate it into the car's computerized system and show the volume on one of the car's information displays?
Are you going to add a hobby Arduino display for the driver?
Paul