For over 30 years pHionics has manufactured isolated water quality transmitters for monitoring and control
submersible water quality transmitters
A typical application shown with anti-blowout, 316 SS fitting
Simply lower the transmitter and cable into the tank, lake, well, etc.. For applications that require more stability and/or protection of the cable and transmitter from mixers, chemical injection points, etc. -- reverse the cmp34s compression fitting and mount at the end of a standpipe or equivalent, as shown.