Abstract: A piezoelectric actuated device for acquiring and dispensing fluid samples is described. Fluid samples are acquired or drawn up into the device by dipping the tip into a fluid and applying an alternating current electrical signal to the piezoelectric element. Removing the tip from the fluid and applying another electrical signal causes drops of fluid to be ejected for non-contact dispensing. The device optionally incorporates a second piezoelectric element functioning as a sensor to detect if it is empty, plugged or working properly. An optional heater, temperature sensor and feedback circuitry regulate the temperature of the device.

Abstract: A burette tip (1) for metering a titrating agent consists essentially of a burette body (10) with a seat (3) for a membrane and with such a membrane (2). The burette tip (1) comprises, for protecting the membrane (2) and the seat (3) against mechanical damage, a covering (4, 5, 15) which at least partly encloses and covers the membrane (2) and the seat (3). The membrane (2) is clamped between the burette body (10) and a cover part (5) and is held in the burette body (10).