Patent ID: 8568575

Claim:
An adjustable insertion assembly for modular electrochemical potential measurement sensors, the assembly comprising: an elongated electrode holder having opposite proximal and distal ends and an opening configured to removably receive therein, through the proximal end of the holder, an electrochemical sensor having measurement and reference half cells, the electrochemical sensor configured for electrochemically responding to a process analyte upon contact with a process fluid; a receptacle defining an aperture configured to slidably receive the electrode holder therein, wherein the electrode holder is configured for slidable movement within a range of motion extending from a distal inserted position to a proximal retracted position; the receptacle having an open distal end portion configured for extension through a wall of a process fluid vessel, wherein the electrode holder is open to the process fluid when the electrode holder is disposed in the inserted position, and closed to the process fluid when in the retracted position; a leverage member coupled to the receptacle, and configured for releasable movement relative to the receptacle; an extension captured by the leverage member and configured for being moved by the leverage member relative to the receptacle; the receptacle having an abutment configured to engage the extension in a sliding, interference fit, so that movement of the leverage member in opposite directions alternately clamps and releases the electrode holder relative to the receptacle to substantially prevent and permit movement at substantially any point within the range of movement; a flange disposed at the distal end of the electrode holder, the flange sized and shaped to engage the distal end of the receptacle and prevent further proximal movement of the electrode holder relative to the receptacle when the electrode holder is disposed in its retracted position to provide a mechanical stop for the electrode holder and close the aperture of the receptacle to the process fluid; wherein when the electrode holder is in its retracted position, the opening of the holder is closed to the process fluid and the sensor is removable from the opening of the holder through the proximal end of the holder.