关注微信:

产品

热线
下载

VKL 100

Dilution system with dilution factor 1:100


     The dilution systems from Palas® are characterized unambiguously. This is documented with a calibration certificate for each individual device.
     The dilution steps deliver a temporally constant, representative dilution with the factors 10 and 100.
     The dilution systems can be cascaded with the factors 100, 1,000, 10,000 and 100,000
      Low compressed air consumption , e.g. just  128 l/min with a dilution factor of 10,000 with four VKL 10 systems 
     The dilution steps are combinable with all common particle counters.
     These cascaded dilution systems can be tested by the users themselves with a simple test set-up.
      Isobaric dilution up to 10 bar overpressure / isothermal dilution up to 120°C with the VKL 10 E, VKL 10 ED, KHG 10 and KHG 10 D dilution systems
     Simple functional test on-site

Description

The VKL 100 series of dilution systems can reduce the concentration of aerosols by the dilution factor 1:100, also of very highly concentrated aerosols, in a defined and reliable way.

The Palas® VKL 100 dilution systems are used in vertical operation for the particle size range up to 2 µm for applications in the clean room. Dilution factors of up to 1:100,000 are achieved by cascading several VKL systems.

Functional principle

Particle-free air with the volume flow VR circulates through an annular passage around the suction nozzle. Thus, according to Bernoulli, a volume flow VAn is generated at the suction nozzle.

The dilution factor VF is calculated according to the following formula

Representative dilution of particle size distribution of the Palas® dilution systems by cascading

VDI report no. 1973 from 2007 proved metrologically that a reproducible aerosol dilution is possible with the Palas® dilution systems down to VF 100,000.

Simple functional test on-site

With this simple test set-up, the Palas® cascaded dilution systems can be checked by anyone themselves:

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 (position 2), the total particle count form the measurement in position 1 is divided by the total particle count from position 2.

Experimental setup

Position 1: Lab air

Position 2:  Lab air

The VKL 100 serves to measure coincidence-free with the OPC; the VKL 10 is tested.

Measurement example

Calculation of the dilution factor:

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.

Table 1:  Technical characteristics of Palas® dilution systems

Datasheet

Dimensions

100 • 245 • 100 mm

Weight

approx. 4 kg

Dilution factor

1 : 100

Isokinetic suction nozzles

0.028 – 0.06 l/min, 0.23 – 0.5 l/min, 0.6 – 1.6 l/min, 2 – 5 l/min, 28 l/min => 15 – 37 l/min

Maximum particle size

< 2 µm (for dusts)

Special features

Cascadable

Volume flow (clean air)

17 – 45 l/min

Volume flow (suction flow)

0.15 – 0.5 l/min

Compressed air supply

4 – 8 bar

Benefits


     The dilution systems from Palas® are characterized unambiguously. This is documented with a calibration certificate for each individual device.
     The dilution steps deliver a temporally constant, representative dilution with the factors 10 and 100.
     The dilution systems can be cascaded with the factors 100, 1,000, 10,000 and 100,000
      Low compressed air consumption , e.g. just  128 l/min with a dilution factor of 10,000 with four VKL 10 systems 
     The dilution steps are combinable with all common particle counters.
     These cascaded dilution systems can be tested by the users themselves with a simple test set-up.
      Isobaric dilution up to 10 bar overpressure / isothermal dilution up to 120°C with the VKL 10 E, VKL 10 ED, KHG 10 and KHG 10 D dilution systems
     Simple functional test on-site

Applications


      Aerosol measurement technology: test aerosols from filters and inertial separators
      Separation efficiency determination with counting measuring methods, e.g. HEPA/ULPA filters
      Leak test and acceptance measurements of clean rooms, isolators and safety work benches
      Inhalation toxicology
      Quality control of respirator masks and filter cartridges