公开(公告)号：JPS62261950A

公开(公告)日：1987-11-14

申请号：JP10469986

申请日：1986-05-09

Applicant: TOA ELECTRONICS

Inventor： SUZUKI KIYOSHI

IPC: G01N27/26 ,  G01N27/416

Abstract: PURPOSE:To easily detect the crack generated at the detecting end of an electrode by passing specified AC current in superposition to a circuit for generating the electromotive force of the electrode and detecting the current change thereof. CONSTITUTION:The AC current is passed from an AC power source 5 via a capacitor C for blocking DC current to a detecting circuit loop connecting the detecting end for measurement consisting of the indicator electrode 1 such as glass electrode, liquid 3 to be examined and a reference electrode 2 and an input terminal of a measuring apparatus. Abnormality is detected from the change (e) of the AC voltage generated at both terminals of a resistor R1 inserted into said circuit. The presence or absence of the generation of the abnormality is detected continuously without removing the electrode and without affecting the measurement according to the above-mentioned method. The device can deal quickly with the abnormality by a pilot lamp 10 or the like if such abnormality arises.