SE512534C2

SE512534C2 - Method for cleaning electrodes in measuring equipment

Info

Publication number: SE512534C2
Application number: SE9901446A
Authority: SE
Inventors: Johan Elvin
Original assignee: Btg Kaelle Inventing Ab
Priority date: 1999-04-22
Filing date: 1999-04-22
Publication date: 2000-03-27
Also published as: FI20000965A0; SE9901446D0; JP2001025717A; FR2792726A1; CA2305980A1; FI20000965L; SE9901446L

Abstract

The invention relates to a method for cleaning electrodes, especially in measuring equipments. The electrodes, when carrying a coating, are exposed to a cleaning electric pulse having saw-tooth wave form and an initial potential of -1,5V, which, at a rate of 1 V/sec is reduced to 0 V and then immediately returned to -1,5V, said cycle being repeated a number of times sufficient to remove the coating, whereupon the electrodes are normalized by being brought to a final 0 V potential.

Description

512 534 " 2 ningar även i svåra miljöer såsom tryckerimiljö och pappersbruk. 512 534 "2 ings even in difficult environments such as the printing environment and paper mills.

Uppfinningen beskrivs närmare nedan med hjälp av ett föredraget utföringsexempel.The invention is described in more detail below with the aid of a preferred embodiment.

Vid det föredragna utföringsexemplet av uppfinningen består sättet för rengöring av elektroder i mätutrustningar i att elek- troderna med sin beläggning utsätts för en sågtandspuls med följande specifikation. Från en potential från -1,5 V så skall potentialen falla med en hastighet av en 1 V/s till 0 V för att sedan så fort utrustningen klarar återgå till -1,5 V. Detta upp- repas tillräckligt många gånger för beläggningens avlägsnande och vanligtvis sker upprepningen cza 20-60 gånger beroende pà typ av beläggning.In the preferred embodiment of the invention, the method for cleaning electrodes in measuring equipment consists in that the electrodes with their coating are exposed to a sawtooth pulse with the following specification. From a potential from -1.5 V, the potential must fall at a speed of 1 V / s to 0 V and then as soon as the equipment is able to return to -1.5 V. This is repeated enough times for the coating to be removed. and usually the repetition occurs cza 20-60 times depending on the type of coating.

Den nya metoden utgörs såsom nämnts ovan av en puls som upp- repas. När pulsen genereras så bildas en mekanisk pàverkan av beläggningen samt en vätgasutveckling på elektrodytan. Denna gasutveckling som utgörs av vätgas, gör att beläggningen lossnar och knuffas iväg av gasen. För att sedan få elektroden att bli normaliserad, dvs ej få en polarisering, så sjunker potentialen till 0 V med en långsammare hastighet än vid pulsens bildande, för att sedan avslutas med 0 V såsom slutpotential.As mentioned above, the new method consists of a pulse that is repeated. When the pulse is generated, a mechanical effect is formed by the coating and a hydrogen evolution develops on the electrode surface. This gas evolution, which consists of hydrogen gas, causes the coating to come loose and be pushed away by the gas. In order to then cause the electrode to become normalized, ie not to have a polarization, the potential drops to 0 V at a slower speed than during the formation of the pulse, and then ends with 0 V as the final potential.

Claims

512,534 Patent claims

Method for cleaning electrodes in preferably measuring equipment, characterized in that the electrodes with their coating are exposed to a washing pulse in the form of a sawtooth-shaped pulse from a potential of -1.5 V which is allowed to fall at a speed of 1 V / s to 0 V to then immediately be allowed to return to -1.5 V and which process is repeated sufficiently many times to remove the coating, after which the electrodes are normalized by allowing the pulse to drop to 0 V as the final potential.

Method according to claim 1, characterized in that the potential is allowed to fall and return between its values about 20-60 times depending on the type of coating.