| 摘要 |
PROBLEM TO BE SOLVED: To provide a measurement system capable of saving labor in apparatus maintenance while maintaining measurement accuracy by reducing a replenishing amount of an internal liquid in the long term use of a measurement device using a reference electrode.SOLUTION: The reference electrode 6 comprises: a second internal liquid chamber 36 in which a second internal liquid 15 having a specific gravity larger than that of a measuring liquid 9 to be measured is charged; a second body 42 formed so that the second internal liquid 15 is contacted with the measuring liquid 9 flowing thereon through a liquid junction 40 provided in an upper end portion of the second internal liquid chamber 36; an internal pole R arranged to be contacted with the second internal liquid 15 in the second internal liquid chamber 36; and an internal liquid replenishing pump for replenishing the internal liquid chamber 36 with the second internal liquid 15. The internal liquid replenishing pump intermittently replenishes a predetermined amount of the internal liquid at intervals of a predetermined period. |
