Chemistry: electrical and wave energy – Apparatus – Electrolytic
Patent
1985-01-29
1986-03-18
Niebling, John F.
Chemistry: electrical and wave energy
Apparatus
Electrolytic
G01N 2738
Patent
active
045767041
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention concerns apparatus for the electrochemical detection of the oxygen content of liquids by measurement of an electric current between two electrodes made from different materials immersed in the liquid, which electrodes are, with the exception of their effective free end surfaces, fully embedded in insulating material, wherein for cleaning the free electrode end surfaces a grinding device is pressed by means of at least one spring both to the free electrode end surfaces and to the adjacent surface area portions of the insulating material and the electrodes are so shaped and arranged that in the course of continued grinding of the electrodes and the insulating material, the shape, size and mutual spacing of the effective end surfaces remain unchanged.
An apparatus of the above type is disclosed in Swiss Pat. No. 469,981. According to this patent the two electrodes are formed by coaxially arranged pipe sections which are radially spaced apart, the pipe sections being fully embedded in an electrically insulating synthetic material body with the exception of one of their end surfaces lying on the same axial slide. To clean the effective, free electrode end surfaces a grinding organ is provided which is rotatable by a driving device around the axis of the tube sections, the grinding body having a grinding surface bearing against the free end surfaces of the pipe sections and the surface portions of the synthetic resin body adjacent to these end surfaces, and is pressed against the noted surfaces under the bias of a spring. Although this known apparatus has proved itself well in practice, it has a disadvantage which in certain circumstances is troublesome, i.e. because of the different hardness, abrasion-resistance and corrosion properties of the two electrodes consisting of different materials, a fully uniform wear or abrasion by means of the common grinding body is not always assured and various deposits of grinding particles may adhere to the free ends of the electrode end surfaces. This may result in variations in the electrochemical properties of the free electrode end surfaces, whereby the accuracy of the oxygen measurements is impaired or a frequent recalibration of the measurement apparatus becomes necessary.
SUMMARY OF THE INVENTION
Accordingly, the object of the present invention is to provide an apparatus of the above-described type which avoids the above-described disadvantage and provides an increased uniformity of the grinding-off and cleaning of the two free electrode end surfaces is assured by the common grinding device.
In the apparatus according to the invention each electrode is embedded in its own insulating body and forms with it a single structural unit which is pressed against the grinding device by means of at least one associated spring independently of the other structural unit, the designer has it under his control to bring about an optimal grinding and cleaning effect by the individual sizing or rating of the spring forces for each electrode and to do this despite the different hardness, abrasion resistance and corrosion properties of the two electrodes.
Further details and advantages of the invention will be clear from the following description of preferred embodiments as well as the associated drawing in which the invention is illustrated purely by way of example.
DESCRIPTION OF THE INVENTION
FIG. 1 shows an axial longitudinal section through the essential parts of apparatus formed according to the invention for the electrochemical measurement of the oxygen content in liquids;
FIG. 2 represents a cross-section along the line II--II in FIG. 1.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
The apparatus illustrated in the drawing has a vertically extending carrier pipe 10 which is provided at its lower end with an inwardly projecting flange 11. A sleeve-shaped guide housing 12 is secured at the flange 11 and in it are disposed two sleeve rings 13 and 14 of which one is coaxially disposed in the other. The outer sleeve ring 1
REFERENCES:
patent: 1668434 (1928-05-01), Todd
patent: 3155603 (1964-11-01), Hart
patent: 3496084 (1970-02-01), Stack, Jr.
patent: 3574079 (1971-04-01), Kalman
patent: 3875036 (1975-04-01), Morris et al.
patent: 4285792 (1981-08-01), McGandy
Chiusole Erwin
Zullig Hans
Nguyen Nam X.
Niebling John F.
Zullig AG Rheineck
LandOfFree
Apparatus for the electrochemical detection of the oxygen conten does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Apparatus for the electrochemical detection of the oxygen conten, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus for the electrochemical detection of the oxygen conten will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2304497