公开(公告)号：US20190317043A1

公开(公告)日：2019-10-17

申请号：US16317097

申请日：2016-07-12

Applicant: HONEYWELL INTERNATIONAL INC.

Inventor： Na WEI ,  Yuzhong YU ,  Ling LIU

IPC: G01N27/407 ,  G01N27/30

Abstract: An electrochemical hydrogen cyanide sensor (1) comprises a housing (10) comprising an opening (2) allowing gas to enter the sensor (1); an electrolyte disposed within the housing (10); a plurality of electrodes in contact with the electrolyte within the housing (10), wherein the plurality of electrodes comprise a working electrode (5) and a counter electrode (7), and wherein the electrodes comprise a metal catalytic material; and a filter (3) operable to cover the opening (2) of the housing (10), and prevent hydrogen sulfide from reaching the electrodes, wherein the filter (3) comprises silver sulfate layered onto a polytetrafluoroethylene support material.

公开(公告)号：US20200025706A1

公开(公告)日：2020-01-23

申请号：US16329254

申请日：2016-08-31

Applicant: HONEYWELL INTERNATIONAL INC.

Inventor： Yuzhong YU ,  Ling LIU ,  Feng LIANG

IPC: G01N27/30 ,  G01N27/38 ,  G01N27/403

Abstract: Methods and systems for identifying contamination of an electrochemical sensor (10) and cleaning the electrochemical sensor (10) are provided. A method may comprise scanning the sensor (10) for the first time using CV to generate a reference set of readings; scanning the sensor (10) for the second time after the sensor (10) has been employed; comparing a second set of readings from the second CV scan to the reference set of readings; when the second set of readings is different from the reference set of readings, determining that the sensor (10) potential has shifted; scanning the sensor (10) for the third time to clean one or more elements of the sensor (10); scanning the sensor (10) for the fourth time; comparing a fourth set of readings from the fourth CV scan to the second set of readings; and determining that the potential of the sensor (10) has shifted due to pollution of the sensor (10), and/or that the sensor (10) can be further cleaned.