Abstract: A simplified clean conductivity or pH cell assembly comprising a solid plastic cell body and a test fluid conduit comprising a clean pipe fitting, affixed to the forward face of the solid body by means of an external clamp and a seal such as an O-ring. The clean pipe fitting is preferably formed of stainless steel and the internal surface thereof which comes in contact with the test fluid is plane and has no crevices or the like which could cause contamination of the fluid.Pencil shaped electrodes are fixed in said solid body and extend therefrom into the test fluid in the conduit to be measured. The face of the solid body which is in contact with the test fluid is plane with no cavities, crevices, holes, projections, restricted channels, or the like. The electrodes for conductivity or pH measurement are cleanly formed of glass or stainless steel or other suitable material and have no surfaces which might result in contamination or the collection therein of dirt and the like.

Abstract: A conductivity cell for measuring the conductivity of a liquid comprising a pair of spaced apart electrodes insulated from each other. The proper spacing of the electrodes is provided by a washer formed of insulating material and it is strong, rigid and highly stable chemically and mechanically and is substantially unaffected by wide temperature variations. A single electric conducting element extends through the cell and at one end is electrically fixed to one of the electrodes. The single electric conducting element is adjustable to maintain the two electrodes and insulating washer in proper position. A protective and insulating shield is provided for detachable connection to the conductivity cell to protect the electrodes.