| 摘要 |
<p>The unit has a contraction hose (10) extending between two separate head pieces (11.12) that undergoes a contraction when subjected to internal pressure and a position sensor device for detecting the distance between the head pieces based on the extension of an elastic measurement object (16) between the head pieces with the aid of a strain gauge (18). The measurement object extends between the head pieces or in or on the wall of the contraction hose.</p> |
