Probes for Orp

bdickens · 01/23/2008, 04:16 PM

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 · 02/21/2008, 07:43 PM

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 · 07/17/2008, 02:02 PM

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

01/23/2008, 04:16 PM	#1
bdickens Registered Member Join Date: Jun 2007 Location: Alabama Posts: 23	Probes for Orp 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

02/21/2008, 07:43 PM	#2
ufans Premium Member Join Date: Mar 2004 Location: Fairfax Station, VA Posts: 681	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.

07/17/2008, 02:02 PM	#3
mkzimms Registered Member Join Date: Dec 2006 Location: long island, NY Posts: 92	salinity is actually best and most accurately measured by conductivity when temperature is known.