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 elec...

A conductivity sensor having a fluid immersible, conductivity transformer comprised of a pair of toroidal cores on each of which are wound two windings, one of the windings on one core being the input winding, one of the windings on the other core being the output winding, the second winding on the input core providing a reference voltage and the second winding on the output core providing a means for negative feedback to null the flux in the second core. The output voltage and the reference vol...

The conductivity of an electrolytic solution is determined with accuracy and sensitivity by measuring the conductance along extended paths of small cross-sectional areas between large area electrodes. Current flow is thereby measured with minimization of distortion effects created by electrolytic depositions or other form of electrode surface contamination. Further, sensitivity and reliability are enhanced by employing conductivity cell sections as variable resistance arms in a bridge excited wi...

A conductivity sensor (16) and control circuit (18) for determining the conductivity of a fluid is provided. Conductivity sensor (16) is formed of a first annular electrode (24) spaced apart from a second annular electrode (26) having a tubular portion (28) therebetween. The first annular electrode (24) and the second annular electrode (26) are coupled to a control circuit (18). The control circuit (18) preferably includes a square wave generating circuit (40), a current-to-voltage converter cir...

A conductivity probe having a modular design. A probe body has a distal end and a proximal end. The distal end includes a recessed portion for providing a seat for an O-ring that seals an electrode tip assembly. The probe body also includes a set of internal threads for engaging with cooperating threads disposed on the electrode tip assembly. The distal end of the body terminates in a bottom wall having an opening leading to a connection pipe attached to a junction box. The exterior of the probe...

A conductivity cell wherein thin film or foil electrodes are supported in a case or holder and are separated by an electrically insulative spacer member. A small portion of each electrode together with an exposed surface of the spacer member forms a channel in which thin films of an electrolyte may be deposited from a measured environment and with the electrodes being connected to a conductivity circuit the conductance of the thin film may be measured. If the electrolyte and its concentration ar...

The invention relates to a conductivity sensor with a substantially circular cylindrical casing of synthetic material and with metal measuring electrodes in its planar substantially circular front wall, of which at least two voltage electrodes and at least two current electrodes form poles, wherein at least two substantially circular voltage electrodes are encompassed by at least two plane-form current electrodes extending substantially in a semicircle or by at least four substantially circular ...

A conductivity cell has a pair of similar conductivity measuring sub-assemblies extending in opposite directions from an annular energizing electrode. Each sub-assembly includes a pair of spaced-apart sensing electrodes mounted within a hollow cylindrical electrically-insulating member having electrical connecting wires embedded in the walls thereof. The two pairs of annular sensing electrodes are connected in parallel to a conductivity measuring apparatus while an energizing signal is applied b...

A conductivity meter includes a cell having a passageway through which dialysate flows during measurement. A constriction in the passageway meters the flow and partially defines the cell constant. To measure conductivity, an alternating current is applied to the dialysate through cylindrical electrodes in the passageway on each side of the constriction. A thermistor adjacent one of the electrodes is used to measure the temperature of the dialysate. A housing for the cell includes an elongated ha...

A conductivity measuring cell comprising two tubes arranged concentrically one within the other the outer tube being closed at one end, a first pair of electrodes for connection to a current source one of which is disposed at the bottom of the outer tube and the other of which is disposed near the open end of the outer tube and adapted to extend within the inner tube so as to make contact with any fluid contained therein, and a further pair of electrodes, for connection to a voltage measuring ar...