PURPOSE: To prevent an electrolyte, etc., from leaking by forming the liquid junction of the collating electrode in a specific shape.
CONSTITUTION: The liquid junction of the collating electrode formed of a container 1 which is equipped with a bellows 3, etc., and made of ethylene tetrafluoride, etc., is shaped in a frustum of a cone and inserted into a container body. In this constitution, even if the electrolyte 2 in the container 1, the container 1, etc., expand in different states as the water temperature in an autoclave rises, the clearance formed between the liquid junction and container body is blocked automatically with the conic part of the liquid junction 4. When the temperature falls, on the other hand, outward leakage of the electrolyte, inward leakage of water, etc., are prevented similarly.
IBE HIDEFUMI
KATSURA AKIHIDE
