Main element for current-injection type piezoelectric sensor

摘要

A movable table has a fixed injection part with channels for a sample to pass over a piezoelectric crystal in an opening in a plain surface of the element. The table can be raised and lowered using a lift mechanism attached to a rotating shaft. The liquid channels are only connected when the table is lifted. The main element has a piezoelectric crystal inserted in an opening in a plain surface. A movable horizontal table has slits at its ends to deliver or receive piezoelectric sensors. The table can engage one or more upright carrier stands. A lift mechanism arranged under the table is fixed with a rotating shaft (12) and a cam (14) or with a block fastened to the rotating shaft. The shaft is supported on a plate (10), so that it rotates in one direction, so that the cam or block lifts the table, and rotates in the opposite direction so that the table sinks under gravity. A fixed injection part is arranged on top of the table and has a transparent end (30) with a loading and an unloading channel and a fixing end, which is fixed to one or more carrier stands, so that the transparent end is narrowly connected to the plane surface of the piezoelectric sensor, if the table is lifted. A liquid sample can be injected into the loading channel, to flow past the crystal and into the unloading channel.