Ok so first i’ll give you a little background before I get into this.
I’ve been into the world of microcontrollers for maybe 6 years. I am a diy addict, and I have have a minimum of 1 raspberry pi and 1 arduino in any given room in my house. I don’t post on forums hardly ever – I know how to use a search engine. I am a huge lurker. Sometimes I just can’t find an answer or the information I do find is way over my head. Seldomly I give up. The following problem I have picked up and given up more times than I can count. Now I’m at the point of either putting it to use or getting rid of it.
The product I am referring to can be found on ebay or anywhere else, I won’t link to it. It’s an APEX controller by Ecolab. It is a industrial chemical dosing and monitoring system for a commercial dishwasher. I have seen it in use several times passing through various locations, and I always thought of all things that are in there that I could repurpose. Then one day I needed an accurate peristaltic pump that needed to be very particular, not something I could buy prebuilt. I purchased this apex machine for next to nothing, the seller barely made enough to cover his shipping. I went on to complete my project with lots of leftovers from the device. Over the course of a couple years I have used the other various sensors and switches and actuators for various things. Now I have a use for a probe that came with this device. I need a longer term conductivity sensor, and this product has one with it. It is a toroidal conductivity sensor. If I can use it great! If I can’t well then I won’t continue this any further. An EC probe for continual use is in the hundreds and they need to be replaced every year or two. At that rate, I will just continue using a refractometer. The Apex is able to detect total dissolved solids and electrical conductivity using this probe. As I understand, that information with a little math can be used to determine salinity.
Here lies the problem. I cannot find any brand names or part numbers on the probe. So no data sheet. All i have is a hermetically sealed probe with 7 wires coming out. I measured the resistance and found that 2 pairs of wires have continuity. I snipped the connector off and peeled back some insulation and found that those two wires are shielded. So, my assumption is that (please see photo below) the red and black go to one toroid, and the green and white go to the other. The ground being obvious and the other two wires I would assume are for a temperature sensor. The information I could find about toroidal sensor implementation mostly touches on a broad overview of how they work. I did not find any hardcore examples, or small projects/ diy blogs (lol - or instructables) with one of these probes being implemented. That doesn’t surprise me given the high cost of these probes. This gives me more reason to use it.
My question comes down to how would I go about reading from this probe, and am I correct to assume this pinout?