(19)
(11) EP 0 250 243 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
17.08.1988 Bulletin 1988/33

(43) Date of publication A2:
23.12.1987 Bulletin 1987/52

(21) Application number: 87305422

(22) Date of filing: 18.06.1987
(84) Designated Contracting States:
AT BE CH DE ES FR GB GR IT LI NL SE

(30) Priority: 19.06.1986 GB 8614899

(71) Applicant: W.R. GRACE & CO.
 ()

(72) Inventor:
  • Sly, Timothy John
     ()

   


(54) Burette


(57) The invention provides a burette having a body 1 adapted to receive at one end a releasable reagent container 3 having a removable end fitting with a cannula 7 such that the cannula 7 ruptures a self-re-sealing diaphragm of the reagent container 3 when the end fitting is mounted on the reagent container 3, and that the diaphragm is allowed to re-seal when the end fitting is removed.
The burette also includes an electric linear actuator comprising a stepping motor 8 and a reciprocable drive shaft 9, and includes a re-chargeable battery 10 with power to the stepping motor 8 controlled by a push button 11.
A further push button 12 re-sets a digital display means 13.
An interface socket 14 allows the burette to be connected to an external controller such as a microcomputer, and may serve as a power input connector for battery charging.







Search report