Apparatus for determining and/or monitoring a process variable

G - Physics – 01 – F

Patent

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G01F 23/26 (2006.01)

Patent

CA 2677775

The invention relates to a device for determining and/or monitoring at least one process variable of a medium (1). Said device comprises at least one probe unit (3) and at least one electronic unit (4) which applies a triggering signal to the probe unit (3) and receives a receive signal from the probe unit (3). The probe unit (3) is provided with at least one probe electrode (5) and at least one guard electrode (6). The probe electrode (5) and the guard electrode (6) are at least partially surrounded by at least one insulation unit (7). According to the invention, the insulation unit (7) is less thick in the area of the guard electrode (6) than in the area of the probe electrode (5).

L'invention concerne un dispositif destiné à déterminer et/ou à surveiller au moins un paramètre de traitement d'un milieu (1), dispositif comprenant au moins une unité de sonde (3) et au moins une unité électronique (4), laquelle sollicite l'unité de sonde (3) par un signal de commande, et reçoit de l'unité de sonde (3) un signal récepteur, l'unité de sonde (3) présentant au moins une électrode de sonde (5) et au moins une électrode de garde (6), l'électrode de sonde (5) et l'électrode de garde (6) étant entourées, au moins partiellement, d'au moins une unité d'isolation (7). L'invention est caractérisée en ce que l'unité d'isolation (7) présente, dans la zone de l'électrode de garde (6), une plus faible épaisseur que dans la zone de l'électrode de sonde (5).

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