DE7932060U1 - Multiple probe sampler - Google Patents

Description

The invention relates to a multi-probe sampling device for large Channels, consisting of several individual probes with individual collecting cross-sections distributed over the channel cross-section, which at at least one sampling manifold is connected.

Sampling devices are used in systems in which samples of the air are to be taken for control purposes, for example for radioactive contamination. This includes in particular the sampling of iuftgetragenen radioactive substances in plants, the Probenchme done from the exhaust air before delivery into the Afenosphäre to obtain in this way a check on whether the exhaust certain levels of activity does not exceed and can be released into the atmosphere.

Sampling devices of the type described above allow sampling for measuring the activity of airborne radioactive substances in those cases in which a direct measurement cannot be carried out. Reasons for this can be: B, be: too low an activity concentration, Ambient radiation, presence of other radionuclides and unfavorable environmental conditions.

While in channels of small cross-section a sampling device with a single probe can be sufficient, large channels of appropriate cross-section require sampling devices with multiple probes to thereby to obtain a representative sample.

Well-known multi-probe sampling devices are iso-kenetic, the inflow opening forming the collecting cross section each having a "

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Ehtndhlnesörtde is so designed / that in this Befeich the the same flow velocity prevails / as the surrounding air has * ßä2U have the well-known Vielfcichsöhden test devices a pro " nutritional line / where the individual sorideri are connected in such a way that whose collecting cross-sections are open to the direction of flow of the kebab are, - The individual probes open out over a radius into the sampling manifold / the is oriented in such a way that the flow in the individual sands is more or less tangential to the flow in the sampling chamber takes place «|

These known Mehrfächsönden sampling devices have the disadvantage of |

that they cause a strong deflection of the flow through the individual probes protruding almost at right angles from the sampling manifold, whereby a selection of the accompanying dust takes place, so that the measurement is falsified. The forking of the individual probes from the sampler arm line also leads to a bulky design of the sampler, so that the introduction |

requires a relatively large duct wall breakthrough. There are therefore | appropriately sized flanges are required to make the duct wall breakthrough " Reseal.

The invention is based on the object of creating a multi-probe sample acquisition device to which the yörbeechr! levels: Disadvantages do not appear; be liable.

Starting device from the above-described multi-probe sampling \ If the solution d "r Proposed task set, the co- $

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teÜinie each Einzeüonde From S ^ mmelcjUerschnitt from first Ühig, then Finally, in turn, to result in at least one of arches degree linig so that in Anschlußbefeich of the individual probes on the sampling manifold, the center line of each individual probe achspärai 1 * 1 2UF Pfobenahmesammeiieitung Runs _t

Due to the training according to the invention, it is not possible to enter into cell sound is optimally isokinetic, probes allow it In addition, the partial flows of the samples via egg sands with sizes and

well rounded radii. The individual probes terminate such summarized in the sampling manifold, that a diversion of the partial flows in this B _e is rich not required. The sampling device according to the invention thereby enables flow guidance within the individual probes and the collecting manifold, which optimally prevents selection.

According to one embodiment of the invention, the individual probes on the connection side of the sampling collector are combined to form a bundle, which is aligned coaxially with the sampling manifold.

The bundling of the individual probes according to the invention allows a corresponding Large number of individual probes, axially parallel, open into the sampling manifold without being redirected in the connection area allow.

According to a further embodiment of the invention, there is also the possibility of Bundle groups of egg sands each to a sampling collection line to be connected so that, if necessary, sampling with a correspondingly large number of individual probes via several collecting lines

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According to a further embodiment of the invention, the individual probes Pressure losses that are equal to one another on / so that the same Amounts of air flow through the individual probes, whereby the prerequisites are created against a measurement falsification.

Finally, an embodiment of the invention provides that the individual probes are made of copper pipe, with which particularly simply produce large and well-rounded radii for the probes, Which considerably reduces the risk of selection via the flow path will.

In the drawing, an embodiment of an according to the invention is Multiprobe sampler shown. Show it:

1 shows the device arranged in an indicated channel in a plan;

FIG. 2 shows a side view of the device according to FIG.

Form in a channel indicated by 1, indicated as an indication evenly distributed over the cross-section of the duct, a number of individual probes 2 ^ ammel cross-sections. The direction of flow in Channel 1 is indicated by the direction of arrows 3. Against this direction of flow are the collecting cross-sections of the individual probes 2 open. The center lines run from the collecting cross-sections the individual probes 2 initially straight, to then over

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if- two 90 ° elbows with an interim arioifdnUng a öjrädeii or over a I 180 ° bends again to be thoroughly continued «in sufficient

I distance in front of a Einmundurtgsbefeich 4, - in which the Eihzelsörideh 2 I dchspäraiiei lead into SamplingSummelitUhgen 5 ^ the Ein «I zeisonden 2 are combined into bundles 6 / where care is taken / 1 that only large and well rounded radii are created and a deflection I. the flow in connection area 4 does not occur Cause falsification of the measurement.

Claims (5)

Protection claims; 1. Multi-probe sampler for large channels, consisting of several with individual collective cross-sections across the channel cross-section distributed individual probes which are connected to at least one sampling manifold, characterized in that, that the center line of each individual probe (2) from the collecting cross-section initially straight, then in at least one arc and finally again in a straight line so that in the connection area (4) of the individual probes (2) to the sampling manifold (5) the center line of each individual probe (2) axially parallel to the sampling collection line (5) runs. 2. Apparatus according to claim 1, characterized in that the individual probes (2) on the connection side of the sampling manifold (5) are combined to form a bundle (6) which is coaxial with the sampling manifold (5) is aligned. 3. Device according to claims 1 and 2, characterized in that bundle groups (6-6) of individual probes (2) are connected to a sampling manifold (5), 4. Apparatus according to claims 1 to 3, characterized in that the individual probes (2) with each other equal pressure losses exhibit. 5. Apparatus according to claims 1 to 4, characterized in that the individual probes (2) are made of copper tubing. ti it IQ