Probes for Orp

[bdickens]

We are building a water quality monitor (Propeller (PIC-like) based). We have the easy stuff working (Temp, Water Speed, Clarity) but we are about to tackle the hard stuff (Salinity, Oxygen, Ph).

I would like some recommendations on inexpensive problems for these. Anyone had experience with salinity, oxygen or PH probes that they would recommend ? Thanks

 

[ufans]

inexpensive pH and Orp probes can be purchased on Ebay for pretty cheap. The better ones can be purchased from online stores like MarineDepot.

Salinity is best measured by a refractometer. It shouldn't change often so a continual/real-time monitor typically isn't required.

 

[mkzimms]

salinity is actually best and most accurately measured by conductivity when temperature is known.