DE1912056B2 - DEVICE FOR COUNTING AND / OR ANALYZING PARTICLES SUSPENDED IN A LIQUID - Google Patents

Description

Seßstreckungsträger necessary. Bs Kato ledighch S other Meßstrecks same Meßstreckentrain the working position are moved additional S is provided in an expedient development of the Erfmdtmg at least one gas inlet in debouches through-Schtung of the suspension in the region downstream of the test section Thereby, it is mogheh to ventilate the Volumetriereinrichtuftg without this ventilation must be provided by the measuring section itself & the measuring section is no longer disturbed by any dust particles that may be sucked in *

which is directly in accordance with

Measuring head f of the Texk on one

gen and je
largely veri
Mess ° hr3 jufge ^ teckt un ^
tungsngen U, aie

_trained the bore 10 u spirally This is before _SUS pendier- BOm e ^ natr

^ Is gas bubbles _j. ^ _The

give away a particle counting device

^ fschematic in section, partly strong enlarged, with another particle counting device attachable electrode carrier and a measuring section carrier with several measuring sections

Fi 3 is a partly in section of a measuring head _mi r ra dial ° einmündender supply for the liquid with the suspended wedge to be counted Teüchen,

F i g. 4 schematically a measuring section carrier with each measuring section and gas inlet grooves, ^J FIG. 5 schematically a measuring section carrier with 40

35 core 22e ^ the ntt »* -

d 26 _£ th the

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For example, a bill wicm ρ examining

^^^ _ν ^ Electrodes? 2 and 21 liquid ⁵ \ ™, ^V ° " \ _{7 or 2} 7 are poured into the holesη <o _{from there}

^ "^^^^ t ^ S« led to the outside. That the bore 18 to g ^ ^ _da _

_{Groove 3} o 24 a ^^^^ t ^ S «outwards through the bore 18 after

"Nd tepielswdse made of platinum or a platinum pump 34 is running

fitted. The circumferential groove 16 is to accommodate ^^^^^ g

the O-ring seal 15 determines In the bore 61 62. Passage ώ J g _change

of the measuring section carrier 4 is a ruby 41 mrt the level, 4 so * _n ™ _{conditions on} the inside

Bore 40. which represents the calibrated measuring section 50 Reflexions- undBred hu ngsvem _t ^ ^

represents, fitted. To count Teikhen verwui ^ ^des ^ froh ^ ^ ^ n ^ ^^^ ^

Different sizes can easily be used with the Je photocell 61 ^ aue

_ss

the peristaltic pump 34 'conveys liquid from the container 5 through the bore 40 into the glass tube 3 As soon as the liquid level passes through level A , the counter 68 is switched on by a control 67 which, for example, has a photocell 63 as a signal transmitter. The counter 68 then counts the particles flowing through the measuring section 40. A second

i _m signal transmitter 67 entAusschalten the S between the planes A

3 is precisely determined.

3 se, gena j _{] counter}

^ Il be terminated. Shall of ^ | _{i 51 i} plural of

of the measuring tube must be filled with gas before each individual measurement. When a gas-liquid boundary layer passes through planes A and B again , counting is continued in the manner described above. The liquid can be emptied from the measuring tube 3, for example, via a gas inlet 19 which can be closed with a cock 19 'and which advantageously opens into the system between the measuring section 40 and the level A. When the system is ventilated with air, this avoids that the resistance measuring section 40 is clogged by existing dust particles. If different liquids are measured, the measuring tube 3 is automatically ventilated via the hose 52 when the vessel 5 is changed.

F i g. 3 shows another advantageous embodiment of part 2 of a measuring head. The feeding of the The measuring fluid is carried out laterally through the bore 200 and the nozzle 201. This can be designed in such a way that that a hollow needle 203 anchored in a coupling piece 202 can be placed on it. on In this way it is possible to directly test a germ-free test sample with a pierceable one Remove the plug provided with a vessel.

F i g. 4 shows schematically a measuring section carrier 4 with four rubies 41 which are held therein. The measuring sections 40 a, 40 b and 40 c, which are represented by capillaries drilled into the rubies 41, have different cross-sections. A ventilation groove 42 is provided between every two measuring sections. If, for example, the measuring section 40 a is in the working position and the measuring section 40 b is pushed into this position, the ventilation groove 42 in between is used to ventilate the measuring tube 3 (FIG. 2) by canceling the sealing effect of the sealing ring 16. The ventilation grooves 42 can, for. B. also serve as holding points for a locking spring, which holds the measuring section carrier 4 in certain positions. F i g. 5 shows schematically a circular measuring section carrier 4 '. In this six rubies 41 are arranged on a circumference and can be brought into the working position like a revolver. The ventilation grooves 42 ′ are arranged radially between two rubies 41 each. A retaining spring 43 'holds the measuring section carrier 4' in the various working

ao were stuck.

Plastics such as epoxy resins are particularly suitable for manufacturing parts 1 and 2 of the measuring head and Teflon, ceramic, glass and the like. The measuring section support can be made of metal, ceramic, glass or a

be made of plastic. The measuring sections are in Crystals such as sapphire, ruby or quartz, drilled capillaries are particularly suitable.

1 sheet of drawings

Claims (4)

Claims- Irish resistance measuring section to count the change H "in the electrical resistance. Known 1. Use device for counting and / or analyzing particle counters as measuring section and elec- trating electrode-carrying glass vessels suspended in a liquid with a calibrated bore formed as resistance particles, which is formed in at least one measuring section. The Irish property of the liquid under the two necessary electrodes protrude into the vagina, with two vessels for holding the glass vessels. At least one of the glass receptacles suspension, with a small connection, also serves as a volumetric device for the opening between the receptacles (measuring measurement. Disadvantage of these known particle paths) in one of the receptacles counting is that for changing the Measuring section exchangeably attached measuring section carrier to one of the glass vessels or at least a part of the passage of the suspension as well as with two a glass vessel removed and exchanged on either side of the measuring section, to one of the must. The electrodes, which protrude freely into the vessels, are connected to the electrical measuring and counting circuit and are easily exposed to damage
Electrodes, characterized in that, in a known improved measuring section carrier (4; 4 '), the exchangeable particle counter is one electrode fixed to an electrode carrier (1'; 1, 2) with the replaceable electrodes carrying the measuring section therein (12; 21) attached Gefäßteü is connected, namely by applying, which in turn, together with the measuring of a metallic layer on the glass vessel part, stretchers (4; 4 ') an exchangeable part so this does not remove the risk of damage (measuring head) forms one of the vessels (3). for the other electrode and the disadvantage of the expensive one 2. Apparatus according to claim 1, characterized in production of the measuring section carrier. The manufacture indicates that the measuring section carrier (4; 4 ') of the measuring section carrier is expensive, since the calibrated multiple measuring sections (40 α to 40d) of the same or resistance measuring section in the form of a capillary of different sizes and drilled for the 25 stall in a hole in the position of use of the glass must be taken in each case of one of the measuring sections of the vessel part. Frequent replacement (40 a to 40d) in the electrode holder (1, 2) is necessary, since the measurement can be adjusted when cleaning. Leg carrier damage to the fragile 3. Device according to claim 1 or 2, because glassware cannot be avoided in practice,
characterized in that the electrode carrier 30 The invention is based on the object of providing one (1, 2) of the measuring head with an inlet opening device of the type mentioned at the beginning for measuring (20) for connecting a vessel ( 51) connecting line (52) and to be simplified and further developed in terms of function, an outlet opening (10) for connection to a vessel designed as a volume measuring tube (3) and designed as a volume measuring tube (3), which is easy to operate and low-maintenance, is provided, the measuring distance will meet. ger (4) between the input (20) and output To the solution, the input opening (10) is arranged in a device, the type mentioned above suggesting that the measuring section (40) the input opening (20) with a section carrier interchangeable in one; Electrodes of the output opening (10) connects, and a carrier with electrodes firmly anchored therein is placed on the electrodes (21) in the input opening (20), which in turn, together with the and the other electrode (12) in the output measuring section carrier, is an exchangeable part forms one of the vessels at the opening (10) on both sides of the measuring section (40),
are arranged opposite. This creates a compact measuring head, 4. Device according to one of the preceding 45 which takes practical requirements into account, the claims, characterized in that an exchange of damage-sensitive at least one gas inlet (19,42,42 ') provided glass parts is not required, and the electrodes is that in the direction of flow of the suspension are not even when the measuring carrier is replaced Area opens out after the measuring section (40). Risk of damage exposed. The measuring 50 head itself does not have a container function, where- due to the form-complicated and destruction-prone vessels and lines and the use The invention relates to a device for additional amounts of liquid in the measuring vessels for counting and / or analyzing in one is avoided. It's easy interchangeability Liquid suspended particles, which are in 55 and cleaning facility for both the measuring at least an electrical property of the route as well as the electrodes or both to the liquid differentiate, given with two vessels together. Recording the suspension, with a small one in an appropriate embodiment of the invention carries Connection between the opening of the measuring section carriers forming several measuring sections (Measurement section) in one of the vessels 60 more or different size and is for the exchangeably attached measuring section carrier for the use position of one of the measuring sections Passing through the suspension as well as with two both adjustable in the electrode carrier. So that is a on the side of the measuring section, on an electric-fast exchange of the measuring sections under consideration Measurement and counting circuit connected to the required measurement distance trodden. 65 allows. It is known that a structurally particularly advantageous embodiment of the suspended in a liquid Particles with invention different from the liquid is characterized in claim 3,
electrical conductivity by means of the in a particle counting device for counting small