{"id":4606,"date":"2020-07-29T07:02:39","date_gmt":"2020-07-29T07:02:39","guid":{"rendered":"https:\/\/palas-china.com.cn\/en\/?post_type=product&p=4606"},"modified":"2020-11-04T13:14:07","modified_gmt":"2020-11-04T05:14:07","slug":"vkl-10","status":"publish","type":"product","link":"https:\/\/palas.com.cn\/en\/product\/vkl-10\/","title":{"rendered":"VKL 10"},"content":{"rendered":"

[vc_row][vc_column][vc_column_text]The VKL 10 series of dilution systems can reduce the concentration of aerosols by the dilution factor 01:10, also of very highly concentrated aerosols, in a defined and reliable way.<\/p>\n

The Palas\u00ae\u00a0<\/sup>VKL 10 dilution systems are used in vertical operation for the particle size range up to 20 \u00b5m for powders and dusts. Dilution factors of up to 1:100,000 are achieved by cascading several VKL systems.<\/p>\n

Functional principle<\/b><\/p>\n

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Particle-free air with the volume flow VR<\/sub>\u00a0circulates through an annular passage around the suction nozzle. Thus, according to Bernoulli, a volume flow VAn<\/sub>\u00a0is generated at the suction nozzle.<\/p>\n

The dilution factor VF<\/sub>\u00a0is calculated according to the following formula<\/p>\n

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Representative dilution of particle size distribution of the Palas\u00ae<\/sup>\u00a0dilution systems by cascading<\/b><\/p>\n

VDI report no. 1973 from 2007 proved metrologically that a reproducible aerosol dilution is possible with the Palas\u00ae\u00a0<\/sup>dilution systems down to VF<\/sub>\u00a0100,000.<\/p>\n

Simple functional test on-site<\/b><\/p>\n

With this simple test set-up, the Palas\u00ae\u00a0<\/sup>cascaded dilution systems can be checked by anyone themselves:<\/p>\n

Firstly a particle measurement is performed with one dilution step. Here it is important that the aerosol concentration, e.g. lab air, to be measured does not exceed the coincidence limit (maximum detectable aerosol concentration). In the second step, the dilution step to be tested is connected in series (cascaded). To check the dilution factor of the test step (pos. 2), the total particle count form the measurement in pos. 1 is divided by the total particle count from pos. 2.<\/p>\n

Experimental setup<\/b><\/p>\n

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Position 1<\/b>: Lab air<\/p>\n

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Position 2<\/b>:\u00a0 Lab air<\/p>\n

The VKL 100 serves to measure coincidence-free with the OPC; the VKL 10 is tested.<\/p>\n

Measurement example<\/b><\/p>\n

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Calculation of the dilution factor<\/p>\n

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Provided the first measurement is not affected by a coincidence error and the dilution system under test is working (not soiled), a dilution factor of almost 10 is determined. If this should not be the case, there was possibly coincidence in measurement 1. In this case the aerosol concentration has to be decreased or a further dilution step used. Another possibility would be that the dilution step to be tested is soiled. In this case the device has to be cleaned and the test repeated.<\/p>\n

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Table 1:\u00a0 Technical characteristics of Palas\u00ae<\/sup>\u00a0dilution systems[\/vc_column_text][\/vc_column][\/vc_row]<\/p>\n","protected":false},"excerpt":{"rendered":"

Dilution system with a dilution factor of 1:10<\/p>\n","protected":false},"featured_media":4631,"template":"","meta":[],"_links":{"self":[{"href":"https:\/\/palas.com.cn\/en\/wp-json\/wp\/v2\/product\/4606"}],"collection":[{"href":"https:\/\/palas.com.cn\/en\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/palas.com.cn\/en\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/palas.com.cn\/en\/wp-json\/wp\/v2\/media\/4631"}],"wp:attachment":[{"href":"https:\/\/palas.com.cn\/en\/wp-json\/wp\/v2\/media?parent=4606"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}