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Force sensor can be immersed in water?

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This force sensor is designed for human touch control of electronic device. Working principles of this sensor is based on the resistance variation with respect to force. You can’t get much resistance variation in water (Bottom of water line to top of the water line).
 
hello,

For small range senosr as 0,1N to 20N , so correspond to a deep of 0,1Meter up to 20 Meters !
resolution (or Accuracy ) is enough ?
if you can insulate connexions parts, i think it could be possible to use it in water
because resistor part in sealed inside.
What is your water level measure range ?
Does your devices lies in the bottom of recipent , to get all the water height ( so all of the pressure mm of H20)?
 
My water tank height is 1.5 meter. Width and breadth are 2 meters each. 20 pounds = 9 kgs. Here https://learn.adafruit.com/force-sensitive-resistor-fsr/overview

it is mentioned that it can be used for 20 pounds pressure. Only sensor will be at the bottom of the tank. The board willl be at the top of tank and it will wirelessly send the ADC data to master board which controls the pump. I thought of using this FSR because I can get continuous analog data which can be used to show the level of water as a progress bar.

I have another tank, its height is 4 meters.
 

hello

on the post #1 link on device give a range of 0,1N to 20N !
for a range of 1,5M height you will get 1,5N for full scale (or 0,33 pounds)..
so maximum value is less than 1/10 of full scale.. not so good for accurate measurement.

what is true .. link post#1 or link on Adafruit wich gives units in pounds ?
because range of 20N could be better than range of 20 pounds with worhst results..
 
I tried to find the datasheet on the Interlink Electronics site without much luck. It does not appear to be an absolute pressure gauge. But rather, its response depends on the difference in pressure between the front surface and back surface/surrounding medium. That is, it is a differential gauge. If that is true, then given that it is very thin, I do not think its reading would be very meaningful. Now, if you somehow inserted it through the bottom so one surface was exposed to atmospheric pressure, then it might work.

John
 
jayanth.devarayanadurga said:
What if I use the big sensor and fix it to the wall of the tank at bottom instead of floor of the tank?
Click to expand...

Except a few non linearity between 0 level and the height of the sensor itself .. maybe first centimeter
pressure will be the same in every point, like on the wall ..
pressure is the weight of water colum.
100cm -> 1Newton
 
Here's site you might find interesting: https://mysite.du.edu/~jcalvert/tech/fluids/hydstat.htm

On a variation of Mariotte's jar, you might consider sealing the sensor to the end of tube with the sensing surface down. Leave the tube open to the atmosphere and insert from the top of the tank. Then you will get the pressure of the liquid.

John
 
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