Re: Conductivity Sensor

bill.sloman@xxxxxxxx wrote:


Joerg wrote:

Hello Luhan,


I'm constructing a Hydroponics system, and need to monitor the
conductivity of the nutrient solution.

Any suggestions on what to use for the sensors for stable long-term
readings?


I believe corrosion resistance is really important. Titanium is one of
the materials used. An example:

http://omega.com/manuals/manualpdf/M3696.pdf 


Platinum is traditional, and graphite has its devotees.

One of platinum's advantages is that it has much the same coefficient
of thermal expansion as soft soda glass, which can be handy.

-------
Bill Sloman, Nijmegen


I may go for the 'poor mans' version of platinum/titanium - stainless steel is one thing I have in stock here.

--
Luhan Monat: luhanis(at)yahoo(dot)com
http://members.cox.net/berniekm
"Any sufficiently advanced magick is
indistinguishable from technology."
.

Relevant Pages

  • Re: Building a Light Clock
    ... <<Titanium has a coefficient of thermal expansion of 5.2 x 10^-6 ... The SR-71 lengthens by about 12 inches at it's design cruise Mach ... coefficient of thermal ... 18 inches longer than when it took-off. ...
    (sci.physics.relativity)
  • Re: OT? Tales of induhviduals?
    ... >> coefficient of thermal expansion of steel off the top of my head, ... Lithuania has some beautiful women BTW ...
    (sci.electronics.design)
  • Re: OT? Tales of induhviduals?
    ... > coefficient of thermal expansion of steel off the top of my head, ... when I was still working for a electric utility company they hired a ...
    (sci.electronics.design)
  • Re: Crystal structure without diffraction?
    ... > of states relate to macroscropic properties of crystals, ... > properties, coefficients of thermal expansion, heat capacity, etc. ... > coefficient has different magnitudes in different directions, ... using the older measurement techniques at great expense. ...
    (sci.physics)
  • OT? Tales of induhviduals?
    ... So, the boss comes into my office this morning, demanding to know the ... coefficient of thermal expansion of steel off the top of my head, ...
    (sci.electronics.design)