DE1498721B2 - Electrode arrangement for gas analysis, especially for polarographic oxygen analysis - Google Patents

Description

On the basis of the drawing, in which some

In the main patent 1 296 836 there is an improvement in the electrode arrangement according to the

an electrode arrangement for the polarographic invention are shown, for example, the

Oxygen analysis has been described. The invention was explained in more detail.

this is based on an electrode arrangement, FIG. 1 and 1 a show an example with circular

that is described in patent 1,260,199. Object-shaped electrode face in vertical section and

of this latter patent is a top plan view of electrodes;

3 4

Fig. 2 shows a vertical section through a Fig. La represents a plan view of the end face Another embodiment with a circular end face of the electrode head from above.

area of the electrode. interpreted that the feed 21 is in individual lines

The gene branched in the known electrode assemblies, through which the electrolyte approximately in is distributed between the electrode head and the gas through-5 at an angle of 180 ° in order to achieve this casual membrane arranged as a spacer area at all possible angles on the to determine the size of the measuring space serving electrode face 23 flow. On the absorbent and, in particular, the opposite side to the electrolyte are corresponding decreasing ends Layer is omitted, so that the guide channels or other discharge lines gas-permeable membrane 8 on the electrode head io expediently arranged mirror-symmetrically, so that a little loose. The membrane is, as usual, an evenly flushing over the entire circle center a thread 14 on the neck of the electrode-shaped surface of the electrode end face 23 head attached, whereby this thread is a little less guaranteed.

is tightened tighter than usual, so in the tight It is also possible with the arrangement according to

Space between the membrane 8 and the electrode 15 Fig. 1 a concentric spraying of the elec-

head 7 electrolyte liquid can penetrate. to be provided with a scoop head surface. This can be

According to the exemplary embodiment, the example is achieved in that a zen-

penetration of the electrolyte into this measuring space reaches the central electrolyte supply through the membrane 8

through a tube 21 which passes through the interior of one of the electrode 23 opposite point

Electrode head next to the electrode feed 20 is passed.

carried out and through a further tube 22 The conveying element 18 can instead of using pressure

enters the container 9 again. Work with a pressure also with suction.

Suction or pumping element 18 is through the tube The supply and discharge channels 24 on the

21 are constantly supplied with electrolyte liquid and via the electrode head end face according to FIG

flushed away the face of the electrode head. 25 similar to the grooves and grooves 17 according to FIG. 2

The electrolyte liquid is ground, etched in or on the surface through the tube 22

speed fed back into the electrolyte space 9. be introduced in another way. You can also use it as a

This arrangement ensures that the thread system consists of plastic threads or glass threads

Electrode face constantly with new electrodes applied to the electrode face. It is

lyten is flooded. This also makes it possible to train it as a wire system, where-

Lich quick response sensitivity of the measuring with expedient the wire material is the same as

due to the equipment. that of the electrode. It is also possible this

The membrane 8 expediently lies in a somewhat hollow system with the electrode - for example through on the electrode head, so that they connect a well-spot weld ■ - · firmly, so that defined here Measuring space forms; this applies in any case to 35 due to an enlarged electrode surface Rest position. In the operating position, d. that is, if the is standing, that is uniform in all branches and Electrolyte is sucked in by the pump 15, will quickly be supplied with electrolyte liquid the membrane pushed up a little. can. It is also possible to use the electrode wire 23

On the conveying member 18 for the electrolyte is a or a shown in FIG. 2 provided tube or Approach 19 is provided, which by means of a tap 20 40 a ring before melting into the insulating body can be shut off and through which the electrolyte begins to operate with the wire system at the electrode head see each measurement taken from a reservoir and to proceed when melting down so that can be. the wires either from the meltdown

According to the design, the electrode head is either left or on the electrode face

form according to FIG. 2 conical and embedded with 45 in such a way that they are later

radial grooves and / or grooves 17 are provided, which grind the electrode head end face in this

require that the membrane 8 emerge hollow on the elec- tric. You can go to this for example

trodenkopf rests and a slight flow the purpose instead of a solid wire 23 a wire bundle

Use electrolyte fluid between the membrane and the one whose individual wires in the elec-

Electrode head surface allows. 5 ° radial end face in all possible directions

According to FIG. 2 a rubber ball are bent over. The invention

18 provided, the right arrangement of the electrode head filled with electrolyte liquid has the

is that during the measuring process by a simple further advantage that the gas-permeable membrane 8

Compression of the rubber ball through the tube - can be attached more easily, and indeed possible-

Chen 15 is transported upwards, via the circular 55 without attachment by a thread 14, because

ring-shaped electrode face and over the membrane lies on top of the electrode head

the grooves or grooves 17 down into the electro-tight and is passed through the analysis vessel 1

lytraum is derived. sufficiently secured.

1 sheet of drawings

Claims (6)

1 2 patent claims arrangement for polarographic oxygen analysis with an electrically insulating material 1. Electrode arrangement for the polar standing, insertable in an electrode housing graphic oxygen analysis with an electrode head in which one or more entered insulating material, arranged in a 5 fused precious metal wires Electrode housing insertable electrode head, and in front of its end face by means of a for the in which one or more fused wires allow analyzing gas to be permeable, but for the are arranged from noble metal and in front of its measuring electrolyte and the liquid end face to be examined by means of a membrane that is impermeable to the speed to be analyzed, one measurement space is reduced Gas permeable, but is delimited for the measuring electrical expansion, which by a Verlyten and the liquid to be examined connection line with a reference electrode space permeable membrane a measuring space is connected less, the electrode head at least Extension is delimited, which by a along one of its end face enclosing zone Connection line with a reference electrode - with the formation of a narrow annular gap, relatively large Space is connected, the electrode head 15 longitudinal and transverse extension in a counter bearing in the is inserted at least along one of its end faces around the electrode housing, which ring-closing ends Zone with the formation of a narrow gap between the measuring space and the electrolyte liquid annular gap Relatively large longitudinal and transverse feed runs and through a gas-permeable extension into a counter bearing in the electrode membrane and a layer of absorbent housing is used, which annular gap between 20 material is filled in such a way that a considerably long one Measuring chamber "and electrolyte liquid supply diffusion path between measuring chamber and electrolyte runs and there is liquid supply through a gas-permeable membrane. as well as a layer of absorbent material which is filled by the invention according to the main patent art that a considerably long 1 296 836, the electrode arrangement described diffusion path between the measuring space and electrolyte 25 has been further developed in the direction that the liquid supply exists, and where the the task was set to shorten the measuring times with the suction electrode arrangement, which at least partially fills the measuring space, without impairing the capable layer on the end face of the noble measuring accuracy. The special metal wire or the end faces of the noble solution to this problem is, according to this patent metal wires opposite point, an opening 30 in that with an electrode arrangement according to the voltage, the size of which is at least similar to the measuring space at least partially the end face the noble metal wire corresponds example filling absorbent layer to the talking, characterized in that face surfaces of the noble metal wire or the Stirnder in a vessel (3) analytical located the noble metal wires opposite space (2) above the measuring electrode (23) reasonable ₃₅ Place has an opening, the size of which is at least orderly. whose end face protrudes from below into approximately the end face of the noble metal wire ent analysis space (2) and speaks into a conical shape. Opening of the electrolyte container from below The object of the present invention is to be used is, and that to maintain the reasons shown in the main patent 1,296,836 Movement of the electrolyte (9) a conveyor element 40 way of shortening the measuring times of the electrode (18) is provided. arrangement to be pursued further to be even more effective 2. Electrode arrangement according to claim 1, there being means for reducing the measuring times of the electromechanical devices characterized in that the end face of the electrode assembly can be found. Electrode head in the direction of flow of min- According to the invention, the task posed is there- at least one groove (17) is traversed. 45 solved by that in accordance with a main patent 3. Electrode arrangement according to claim 1 1 296 836 formed electrode arrangement of in or 2, characterized in that the conveying a vessel located analysis space above the organ is a pump. Measuring electrode is arranged, the end face of 4. The electrode arrangement protrudes downward into the analysis chamber and into a Proverbs 1 to 3, characterized in that the 50 conical opening of the electrolyte container from below A groove (17) is inserted into the electrode head, and that to maintain the ground groove is. Movement of the electrolyte forward a conveyor 5. Electrode arrangement according to one of the views. Claims 1 to 4, characterized in that an advantageous development of the invention is Electrolyte container as a carrier for the 55 is in that the end face of the electrode head The vessel (1) containing the analysis space (2) is used. in the direction of flow by at least one groove 6. Electrode arrangement after one of the attracted. This makes it possible that the otherwise Claims 1 to 5, characterized in that the usual absorbent intermediate layer, which is used as the electrode end face serves directly from the electrical stand holder for the measuring room and the electrolyte is washed up. Absorbs 60 lytes in itself, completely or partially leaving it out.