MODEL KS-220

 CASCADED IMPACTOR FOR THE FRACTIONATED SAMPLING OF SOLID PARTICLES AND AEROSOLES
IN-STACK VERSION
KS-220

1. Purpose

The KS-404 type portable, partial gas flow emission type sampling circuit implemented with the KS-220 type 3x2 staged cascaded impactor – in automatic operation - is capable of the isokinetic, continuously periodical, total or fractionated sampling of solid particles in flowing air or gas.

The KS-220 type cascaded impactor is the improved version of the OH-610-B type impactor. In accordance with the latest enviromental regulations it is capable of the gravimetric separation of the 10; 2,5 and 1 [mm] sized particles.

The KS-404 type measuring circiut implemented with the KS-220 type cascaded impactor simultaneously with the gravimetric determination of concentration of solid particles and the fractional composition of the flowing air or gas the device is capable of measuring and monitoring the temporal changes of the the velocity of the main gas flow or the sampled medium.

2. Technical description

The double stage impactor device offers completely new solutions. Even its evaluation system follows the latest fluid mecanical configurations.

For the sake of increasing the impact effect and decreasing dimensions particles are accelerated in an annular nozzle to the proper impact velocity. To increase the efficiency of the impacts and to decrease entrainment the sampler is built up from a double impactor stage with identical separation characteristics. The KS-220 type cascaded impactor consists of a lead-in diffuser, three impactor stages one after another and an endfilter.To avoid reproduction errors occuring owing to the different adhesive capacity of particles, stages have a chamber configuration and are properly separated for scaling.

The KS-220 type cascaded impactor confirming with the latest environmental standards – ISO-EN 9096 – has been primarily developed to complete the KS-404 type automatic, isokinetic sampling circuit, although it is compatible with any of the KS-104 or KS-404 type probe shanks. External dimensions and connecting thread sizes are completely compatible with the inlet pipes and probe shanks.

The layout of the KS-404 type measurement circuit comlpeted with the KS-220 type impactor is shown in Figure 1.

Figure 2. shows the cross-section of the KS-220 type impactor assembled with the probe shank.

SPECIAL FEATURES

  • Rapidly changeable impactor stages suitable for performing sequential, continuously periodical measurements.

  • 30% smaller external dimensions, 40% less mass performing the same flow rate.

  • The chambers of the impactor stages can be well separated for scaling.

  • Cleaning and the periodic size-control of the annular vent nozzles are extremely simple.

  • Dust storage capacity is variable by the changing of the collector plates.

  • The static and dynamic pressure exhaust probes and the temperature sensor are assembled together in the probe shank.

  • Automatic, isokinetic sampling, measurement control and evaluation by the KS-400-CV.15/8 type device along with a Windows based software.

    • The sampled gas flows through the diffuser to the first so called 10A then to the 10B chamber. Particles with the cut-off size 10 [mm] precipitate on the collector plates (3) and (4). Particles with sizes 2,5 [mm] precipitate on (5) and (6), and with 1,0 [mm] on (7) and (8) collector plates.

    The sampled gas cleansed from solid particles leaves the impactor through the endfilter (9). The KS-220 preseparator type impactor can be used independently of the probe shank. Figure 3. shows an application example.The impactor in a disassembled state is shown in Figure 4.

    The separation characteristics of the KS-220 impactor, so called „S”-curves are represented in Figure 5. The nominal change of flow rate as a function of the gas temperature is represented in Figure 6. If different measurement parameter are required – higher temperature or high dust concentration which requires higher volume flow rate - the use of the KS-218 type impactor is recommended.

    KS-220

    3. Technical data
  • Nominal flow rate depending on t1:
    		• 1.5 - 2.3 [m3/h]
  • Measuring range:
    		• 0.9 - 2.6 [m3/h]
  • Aerodynamic resistance with clean filter:
    		• 42 [mbar]
  • Number of impactor stages:
    		• 3x2
  • Particle separation values - cut-points:
    		• AR-COM 220 v3.2 software
  • Max. temp. with Teflon gasket:
    		• 180 [°C]
  • Nozzles:
    		• Æ 4.5; 5.6; 7.6; 10.7; 14; 17 [mm]
  • Optional nozzles:
    		• Æ 5.0; 6.2; 6.9; 8.5; 9.5 [mm]
  • Back-up filter:
    		• Æ 43 [mm]
  • Probe connection:
    		• C 3/8” thread

    Figure 1.

    Figure 2.

    Figure 3.

    Figure 4.

    Figure 5.

    Figure 6.