# Electrical conductivity sensor

#### va28

Joined Feb 8, 2023
13
Hello,
I need a conditioning circuit for a Electrical conductivity probe to measure conductivity of water . Can anyone please give the design of the circuit and explain how it is working.
Thank you so much for your help

#### va28

Joined Feb 8, 2023
13
Thank you so much, you have helped me in pH circuit, and now again, with the help of the document you shared, I acquired so much of knowledge about EC circuit.
I have read the whole document, can you please tell what frequency should I choose to derive my conductivity electrode

#### Danko

Joined Nov 22, 2017
1,602
what frequency should I choose to derive my conductivity electrode
I need a conditioning circuit for a Electrical conductivity probe to measure conductivity of water
As author said:
"I have chosen a frequency of 13 kHz because it is the one that maximize the sensitivity in the solutions of medium to low concentrations (<20 g/l NaCl)."
It is better to use frequency 13 kHz and experiment with probe by author's design and same dimensions.
So it will helpful to value your works by comparing them with author's results.

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#### va28

Joined Feb 8, 2023
13

As author said:
"I have chosen a frequency of 13 kHz because it is the one that maximize the sensitivity in the solutions of medium to low concentrations (<20 g/l NaCl)."
It is better to use frequency 13 kHz and experiment with probe by author's design and same dimensions.
So it will helpful to value your works by comparing them with author's results.
Thank you so much, will get back to you again if I get confused with anything, thank you again for your help!

#### Janis59

Joined Aug 21, 2017
1,637
Just immerse the CMOS circuit AND or OR logics two wires into that water and feed them via some several MOhms from Vcc. The best choice is set the logic into Scmitt trigger circuit for more robustness. Works 120% well. For example: https://mysku.club/blog/china-stores/52622.html or https://oldoctober.com/ru/fluid_detector/ or http://we.easyelectronics.ru/antonl...y-dlya-kolodca.html?ysclid=lfcid8k77k41488998 or by means of 555 as here: http://kopilkasovetov.ucoz.ru/index/signalizatory_vody_v_bytu/0-50 or here https://master-electrician.ru/socke...na-mikrosheme-prostoi-indikator-urovnya-vody/

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#### Danko

Joined Nov 22, 2017
1,602
Just immerse the CMOS circuit AND or OR logics two wires into that water and feed them via some several MOhms from Vcc. The best choice is set the logic into Scmitt trigger circuit for more robustness. Works 120% well. For example: https://mysku.club/blog/china-stores/52622.html or https://oldoctober.com/ru/fluid_detector/ or http://we.easyelectronics.ru/antonl...y-dlya-kolodca.html?ysclid=lfcid8k77k41488998 or by means of 555 as here: http://kopilkasovetov.ucoz.ru/index/signalizatory_vody_v_bytu/0-50 or here https://master-electrician.ru/socke...na-mikrosheme-prostoi-indikator-urovnya-vody/
Look at book in attachment:

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