| 摘要 |
The invention relates to concentration measurement transmitters, more specifically to an arrangement for a static, blade-type transmitter, which includes a blade (4) active in the medium to be measured and suspended by a spindle (5) such that shear force moment at the blade is translated via the spindle to a measurement converter (6) for determining fibre concentration in the medium, the converter preferably being situated in the transmitter housing (3), into which the spindle extends and is sealed against it with the aid of a lead-through (7). The lather includes a tube (9) either integral with, or rigidly, cohesively fixed to it and extending downwards to the free end portion of the spindle (5) carrying the blade (4), the spindle extending through the tube (9) with a clearance (8) enabling movement of the spindle necessary for the measurement converter converter (6) for a turning movement of the spindle (5) about a theoretical turning centre (10) substantially at the middle portion of the tube (9), to the free end portion of which tube the spindle is rigidly and sealingly fixe d, whereby a seal in the lead-through (7) is obtained, which does not affect the shear force moment translated to the converter (6) and consequ ently not measurement accuracy either.
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