Patent ID: 8197653

Claim:
Cartridge unit for an electrochemical sensor comprising: a cartridge prefilled with electrolyte comprising a first end closed by a selectively permeable membrane and having a first thread configured for fastening the cartridge to a supporting member, and a second end having a second thread configured for fastening the cartridge to the electrochemical sensor, wherein pitches of the first and second threads are reversed; said supporting member having a first cooperating thread arranged to be detachably fastened to the cartridge; and closing parts configured to fasten to said supporting member and cartridge to close the second end of the cartridge, said closing parts configured to be opened by a user, wherein the first cooperating thread of the supporting member is configured to cooperate with the first thread of the cartridge to receive a first clamping torque to fasten the cartridge to the supporting member, and a second cooperating thread of the electrochemical sensor is configured to cooperate with the second thread of the cartridge to receive a second clamping torque to fasten the cartridge to the electrochemical sensor, and further wherein the cartridge is configured so that the first thread of the cartridge detaches from the first cooperating thread of the supporting member when the second clamping torque is applied so that the cartridge is detachable from the supporting member.