Ion specific sensors

Hi Del,

How low?

While you're answering, I'll see what I can come up with.

Mike

Ta,

I'll get back to you on that when I'm back at work...Tuesday.

Hi,

Back at work today.

We are looking to measure values upto about 1ppm. (expected range 0.4 - 0.8 ppm)

Del

Here is some thing I found after a quick search.

I tend to measure copper in the low mg/l and µg/l ranges so color-metric measurement such as the Hach pocket kit is the best method for my application. I would love to install a APA 6000 Low Range Copper Analyzer to reduce chemical exposure to the techs that pull hourly samples but even with a 30% corporate discount the bean counters don't want to spend the money.

I don't have much of a background in anything related but since copper is such a good conductor it seems like the impedance of the solution would be somewhat inversely proportional to it's concentration. I'm sure that's probably wrong but it's the only thing I came up with.

Thanks for the response, but I already use a conductivity sensor (2 stainless steel pins with a short 5v pulse to sense conductivity) but too many other chemicals effect this sensor.

Dunno if just having different metal for the electrodes woould help...or different pulse time?

Del