Neptune MOS optical sensors in DIY project

[Sleepydoc]

I'm working on an automated RO/DI system using an Arduino controller.

I'd like to use something like the Neptune MOS optical sensors to mount in my DI water reservoir. They use a 4-contact TRRS plug so I assume they're essentially the same as the old Neptune sensors in a new package. + & - contacts for a diode combined with 2 leads for a phototransistor but I haven't seen any actual wiring diagrams for them. Has anyone used these in a DIY application and/or have information on the wiring/voltage?

 

[blaxsun]

I haven't - only that the old optical sensors can be really hit and miss. One of the new LLS will probably yield better results.