| 摘要 |
A sensor apparatus to be used with extraction machinery ( 2 ), said extraction machinery ( 2 ) including a plurality extraction elements which when activated are adapted to deliver an exravted fluid from two or more extraction elements into a common collection line ( 3 ). The sensor apparatus including at least one sensor ( 4 a /4 b) positioned in the common collection line ( 3 ), and at least one controller ( 6 ) adapted to control the activation of said extraction elements, whereby activation of said extraction elements is controlled to prevent said at least one sensor ( 4 a /4 b) being exposed to extracted fluid supplied from all of said extraction elements at any one time.
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