The present invention provides a
cartridge for apparatus for analysing a sample comprising a fluid as a
flow cell for receiving the sample. The
cell is formed from a substantially rigid
support surface (102), a sensor comprising an electrical mechanical
transducer (92), for example a
wafer of
quartz crystal and
adhesive means, such as double sided
adhesive tape (100) attaching the sensor to the
support surface. The
support surface and sensor are spaced from each other by a membrane, which may form part of the double sides
adhesive tape so as to define the
flow cell between the support surface and the sensor. The
flow cell also has an opening (for example, 111) through which, in use, the sample passes. The sensor, forming part of the flow
cell, comes into contact with the sample to enable the sample to be analysed.