does anyone have a ph tester (or what ever is called) circuit?

[delounge]

must be simple
with some kind of explaination

thanks for your help

 

[John Popelish]

must be simple
with some kind of explaination

thanks for your help

I searched "pH meter schematic" and found:
http://www.lce.org/equipment/phmeter/phoper.html
http://www.cyberreefguru.com/electronics/phmeter2.gif
This one does not include the amplifier, but is a pretty good review
of how the probes work:
http://www.biochem.purdue.edu/~courses/undrgrad/221/wwwboard/handouts/supplemental/pH meter.pdf

 

[John Popelish]

must be simple
with some kind of explaination

thanks for your help

Take a look at page 10 of:
http://www.national.com/ds/LM/LMC6001.pdf

 

[gothika]

What are you using it for?(Testing pool ph or critical lab work.)
You can usually pick one up cheaper than you can build.
Scott Welch or Allen Welch makes a variety from a pocket unit to a
high end table top unit.
Try going over to the Edmund Scientific site they sell them.
(I have a small pen type that is extremely accurate that I use for
testing photo chemicals, also works on my swimming pool. Cost 50.00
bucks.)

 

[AC/DCdude17]

X-No-Archive: Yes

Not useful at all without the pH electrode. The most expensive part in this project.

 

[Lim PE]

| I have a nice pocket pH tester sold by Cole Parmer

My uncle ( a crop biologist ) said pocket ph meters are not
durable, so I bought & use a pack of 100 strips of
Universalindikator pH 0 -14 ( made by Merck, in Germany ) :
work well for colourless fluid, but may be less accurate (
colours displayed will be darkened ) for dark coloured fluid.