公开(公告)号：US20200018715A1

公开(公告)日：2020-01-16

申请号：US16503716

申请日：2019-07-05

Applicant: ABB Schweiz AG

Inventor： Benjamin Carr ,  Dave Albone

IPC: G01N27/20

Abstract: A method for monitoring a sensor function of a potentiometric sensor that includes: an ion-sensitive electrode including an ion-sensitive glass bulb; a reference electrode assembly including a reference electrode; and an ion-sensing circuit having a first terminal connected to the ion-sensitive electrode and a second terminal connected to the reference electrode, the circuit measuring the potential difference that develops in the loop between the reference and the ion-sensitive electrode. The method includes the steps of: a) injecting a pre-defined electric test current from the ion-sensing circuit into the loop comprising the reference and the ion-sensitive electrode; b) monitoring an additional potential difference that develops in the loop between the reference and the ion-sensitive electrode in reaction to the injection of the test current; and c) determining if the additional potential difference is within an expected range characterizing healthy function of the sensor.