Discussion in "New Ideas regarding projects" started by    coolmirza143    Nov 26, 2010.
Sat Nov 27 2010, 11:39 am
#11
ah okay good idea mirza. Use stainless and connect it to the base of transistor to avoid corrosion. Dont use metal screw just inject your detector to the tank and make sure it will function as 8 will intended to be.. Hehe
thanks to ur idea for the transistor i just knew that it can b use 4 that application.. Hehe
Sat Nov 27 2010, 11:52 am
#12


ah okay good idea mirza. Use stainless and connect it to the base of transistor to avoid corrosion. Dont use metal screw just inject your detector to the tank and make sure it will function as 8 will intended to be.. Hehe
thanks to ur idea for the transistor i just knew that it can b use 4 that application.. Hehe

romel_emperado



ya i have to use stainless screws i am searching for any other solution!!!! like using aluminum pieces....

and you are welcome enjoy using simple transistor as sensor
Sat Nov 27 2010, 12:01 pm
#13
according to fluid schematic
its look like metallic plates dip in water at some gap
when air comes between plates then it change its ac signal and when water comes then also in this way it works as i think
Sat Nov 27 2010, 12:01 pm
#14


hi mirza
here is one more circuit i use it many times
http://www.electronic-circuits-diagrams.com/alarmsimages/6.gif
ur pvc pipe idea is good and also work too
do protection of wire becoz water will dissolve wires with respect to time

majoka



Thanx for the circuit majoka....i see this and it can be used but i prefer my previous post that consist of optocouple that is a gud idea to implement.....


as u get signal from controller that water is at high level then pump remain off as bottom level reaches pump on and keep on for high level

majoka



here is one more problem as i mentioned water is supplied three times in 24 hours for 3 hours each time so if tank level is low when there is no water supply so in this case controller will turn on the pump and again pump seal will damage coz of dry Head.......

Sat Nov 27 2010, 12:06 pm
#15


according to fluid schematic
its look like metallic plates dip in water at some gap
when air comes between plates then it change its ac signal and when water comes then also in this way it works as i think

majoka



yes Majoka you are right this sensor sense water using capacitive method ....air and water are used as electrolyte between these plates. the sensor capacitance is changed in case of water.....

i think it is better to use and it will avoid electrolytic corrosion that was happening because of using D.C voltage at prob...
Sat Nov 27 2010, 12:07 pm
#16

here is one more problem as i mentioned water is supplied three times in 24 hours for 3 hours each time so if tank level is low when there is no water supply so in this case controller will turn on the pump and again pump seal will damage coz of dry Head.......


mean u has to detect that is water supply is coming or not if it is coming then it goto next conditions and check the level of tank is it full now or not
Sat Nov 27 2010, 12:09 pm
#17


here is one more problem as i mentioned water is supplied three times in 24 hours for 3 hours each time so if tank level is low when there is no water supply so in this case controller will turn on the pump and again pump seal will damage coz of dry Head.......

majoka



yes i have to use condition here detect output of low sensor turn ON water pump if water supply is there else remain OFF.
Sat Nov 27 2010, 12:46 pm
#18
ahehe good discussions friends. Let me subscribe this thread i will learn from u guys. Tnx
Sun Nov 28 2010, 01:32 am
#19




Wow, I hope you have good floors

ExperimenterUK



ya Phil I have concrete Floors......

coolmirza143


Glad to hear it, that's nearly 4 tons hanging over your heads




where i have to apply ac voltage for input???

coolmirza143


For a simple system connect C1 and C2 to probes, such as stainless steel bolts.
One is usually under water, the other at the surface.
When the water reaches the top electrode current flow in the circuit giving a high at the input
on N2.

For multiple levels place the N1 contact at the bottom of the tank
and make copies of the N2 side.
You may need to make C1 a bit bigger to supply more current.

I would use a pressure gauge to detect that water is available.
One idea would be to glue a piece of plastic to the pointer so that it breaks
the beam of that photo detector when the water pressure is high enough.
Sun Nov 28 2010, 07:19 am
#20
hi all, about the sensor used in the schematic is that not a real comercial sensor available in the market?
as i have read its only stainless steel probs or chrome?

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