Seal housing for process retractable analytical electrodes - allowing on=line leakage-free access to electrodes or housing seals

摘要

Electrode holds for a dip, flow, or special cell assembly for analytical chemistry, particularly for pH, Redox, conductivity, oxygen or chlorine concentration measurements, etc., with an onto tube (11) in which a slideable inner tube (12) carrying measurement probe (15,19) is mounted, and with a first sealing device (16,18) which closes it when the inner tube (12) is withdrawn from the process/measured medium, and which is novel in that. A lower flange plate (21) possessing a transverse bore (25) is provided, that a piston (26,26') is arranged inside a flange plate (21) which in conjunction with the flange plate (21) forms a sealed entrance (26a) for the inner tube (12) and by pushing in a direction perpendicular to the retracted inner tube (12) seals the lower aperture (27) of the flangeplate (21). USE/ADVANTAGE - Electrode holder, which can be withdrawn from an operational pipeline, tank, process unit, etc. without loss of process fluid, to allow maintenance/replacement of the electrodes, or even the seals of the electrode holder/housing.