Four-ring electrodes eliminate polarization effects by splitting the four rings into two current electrodes and two voltage electrodes. When placed in a conductive liquid, the current electrodes take the alternating voltage and create a current. Flow-thru and dip versions are available. Probes with 1/2 and 3/4-in. external threads mount on commercial pipe tees.

Omega Engineering Inc.,
One Omega Dr., Stamford, CT 06907,
(203) 359-1660,