Gino D'Hooge
Member
Hello,
can someone explain how i make a potentiostat.
the current to controle should be 10nA - 100nA
can someone explain how i make a potentiostat.
the current to controle should be 10nA - 100nA
potentiostat
- Thread starter Gino D'Hooge
- Start date
kamenges
Member
Potentiostat. I've never heard of it referred to that way. That's pretty good.
Connect the wiper of the potentiometer to one of the other two legs. Which leg depends on which rotational direction you want to be the least resistance.
If you want a maximum current you will need to put an appropriately sized resistor in series with the potentiostat. Resistance of potentiometer and series resistor follow Ohms law.
Keith
Connect the wiper of the potentiometer to one of the other two legs. Which leg depends on which rotational direction you want to be the least resistance.
If you want a maximum current you will need to put an appropriately sized resistor in series with the potentiostat. Resistance of potentiometer and series resistor follow Ohms law.
Keith
Eric Nelson
Lifetime Supporting Member + Moderator
Gino D'Hooge
Member
OP
Hi eric, Keith,
It's a potentiostat !!
I'am testing electrochemical cells, they can be regarded as a network of impedances ( for more info http://www2.umist.ac.uk/corrosion/lecturenotes/Echem/instrume.HTM#Control of Potential )
these cells have 3 electrodes ( anode, cathode and referencepoint ).
the problem is that the impedances of the cell are changing in function of the voltage on the cathode and the load on the anode.
On the anodesite we have a current that has to be constant.
the referenceelectrode ( function of the anodecurrent ) is the feedback that i would like to use to adjust the cathodevoltage and to hold the current cst .
We have a potential control amplifier to feed the cathode, we should have a current follower for the feedback to the amplifier and adjust the voltage and we have current follower on the anode .
Look also at the germansite
http://www.bank-ic.de/de/aplicat/index.html
I am looking for a diagramsample that i can use .
thanks for helping me and sorry for my awfully english.
It's a potentiostat !!
I'am testing electrochemical cells, they can be regarded as a network of impedances ( for more info http://www2.umist.ac.uk/corrosion/lecturenotes/Echem/instrume.HTM#Control of Potential )
these cells have 3 electrodes ( anode, cathode and referencepoint ).
the problem is that the impedances of the cell are changing in function of the voltage on the cathode and the load on the anode.
On the anodesite we have a current that has to be constant.
the referenceelectrode ( function of the anodecurrent ) is the feedback that i would like to use to adjust the cathodevoltage and to hold the current cst .
We have a potential control amplifier to feed the cathode, we should have a current follower for the feedback to the amplifier and adjust the voltage and we have current follower on the anode .
Look also at the germansite
http://www.bank-ic.de/de/aplicat/index.html
I am looking for a diagramsample that i can use .
thanks for helping me and sorry for my awfully english.
Bob K
Member
Hi Gino!
I would think that most manufacturers of electro chem sensors would be glad to help out with a circuit (unless of course you are making your own then you would have to go it alone)
I do not have a canned circuit that you could use altho you might want to take a look at this link - they show a circuit that you could possibly use as a starting point - it even includes a provision for a variable bias setting.
http://www.citytech.com/content/appnote8.pdf
These folks make electrochemical gas detection sensors that need a potentiostat circuit to allow then to be tested.
I hope it helps...
Regards,
Bob
beerchug
I would think that most manufacturers of electro chem sensors would be glad to help out with a circuit (unless of course you are making your own then you would have to go it alone)
I do not have a canned circuit that you could use altho you might want to take a look at this link - they show a circuit that you could possibly use as a starting point - it even includes a provision for a variable bias setting.
http://www.citytech.com/content/appnote8.pdf
These folks make electrochemical gas detection sensors that need a potentiostat circuit to allow then to be tested.
I hope it helps...
Regards,
Bob
beerchug
rsdoran
Lifetime Supporting Member
Eric Nelson
Lifetime Supporting Member + Moderator
Well I'll be!... You learn sumptin new every day! But I don't think I want to get involved in this one...
Notice the first sentence of the page in Ron's first link...
"Whole books have been written on the subject of this mysterious device"
Oh great, Mysterious... Like I don't have enough things in life to confuse me...
beerchug
-Eric
Notice the first sentence of the page in Ron's first link...
"Whole books have been written on the subject of this mysterious device"
Oh great, Mysterious... Like I don't have enough things in life to confuse me...
beerchug
-Eric
rsdoran
Lifetime Supporting Member
Why do you think I didnt say anything, knew what it was and also knowed enuf ta keep my fingers silenced.