Here are the sensors I am trying to measure and then convert into a 0-5V analog output:
pH (acid or base): my understanding is you can use DC voltage to measure this sensor, just not sure what kind it is... impedance / resistive / inductive?
EC (electrical conductivity): Resistive I believe, with an EC of zero giving a 1/1megaohm measurement? has to be AC or you risk the probe wearing out real quick.
10k thermistor (temp): same as EC i believe, a simple resistive sensor
DO (dissolved oxygen): no idea
ion selective probes(nitrates, ammonium, etc): no idea either, possibly the same as EC?
Once I get a grasp of how each type of probe is measured, what resources should I be looking at to tie it all together? How do I reduce noise on the sensors if they are in the same container? What are some of the better methods to test these out if I already have the sensors? breadboarding?
A good example of sensors: http://www.vernier.com