AVR-Chat

How about this?
A water tight ball with a magnet in it.  A magnetic field sensor at the
top of the tank.  The higher the fluid level, the more mag field sensed. 
Use a permeable tube to hold the floating ball so that it stays
more-or-less in one area.  A magnetic sensor sensitive enough for this to
work might be pricey though.  This is a kind of fancy way to do the force
sensor you suggested with no moving parts but a floating ball. :)

DLC

> I think I may have an idea. a pressure sensor at the top of the tank and a
> rod extending down into the tank with a plastic ball fixed at the end. the
> higher the water level the more force on the sensor.
>
> Brian
>
> --- In AVR-Chat@yahoogroups.com, Muhammad Amiruddin
> <amiruddin.muhammad@...> wrote:
>>
>> Dear all,
>>  
>> please help me,
>>  
>> i want make project for measuring the level of water on the tank that
>> approximately 15 m high. what senssor that i should use ?
>>  
>> Is there any ultrasonic senssor wich can measure range until 15 m ?
>>  
>> rgds,
>>  
>> 4mir
>>  
>>
>>
>>
>>
>> [Non-text portions of this message have been removed]
>>
>
>
>
>
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-- 
Dennis Clark
TTT Enterprises