1. Purpose
The KS-400 type samplers are the automatic versions of the KS-100 type portable, emission type, partial gas flow measuring circuits. The KS-400 family of samplers can be used for the determination of concentration of solid particles in flowing air or gas by means of isokinetic sampling.
The KS-404 type portable measurement circuit of the partial gas flow emission sampler is suitable - in automatic operation mode - for isokinetic, continuously periodical, total or/and fractionated sampling of solid particles in circulating air or gas. The KS-404 type probe has been designed with the utmost regard to the recommendations of the relevant EN ISO 9096 and EN 13284 standards.
The measurement of the partial gas stream is carried out by an annular chamber Venturi meter, which practically does not require maintenance; not like the often failing gasometer (due to the high pressure difference, the damaging of the filter and condensation).
The sampling measurement circuit - KS-404 - is built with respect to the latest environmental protection regulations and on the basis of user requirements. All details of the isokinetic sampling is controlled, supervised and documented by PC. The control tests were carried out in our own development laboratory and at the Department of Fluid Mechanics of the Budapest University of Technology and Economics and in the Institute of Environmental Management.
The KS-404 sampler probe head - Figure 1. - has four different constructions:
Thimble filter 26´60 [mm] “A” Figure 2.
Quartz wool and plane filter Æ 43 [mm] “B”
Plane filter Æ 43 [mm] “C Figure 3.
Preseparator the KS-220 cascaded impactor (PM10/PM2.5/PM1)
The type KS-404 measurement circuit is also suitable for the gravimetric determination of concentration of solid particles and dust in flowing gases and air, with simultaneous measurement and continuously periodical supervision of the temporal changes of the flow rate of the main gas flow and of the sampled medium - gas or air.
2. Technical description
Due to the pressure difference generated by the vacuum pump the sampled gas or the partial gas flow enters the sampler thruogh a short suction nozzle, passes through the filter in the probe head, travels through the sampling pipe, the exhaust hose, the moisture separator, the drying tower and the Venturi meter, and through the outlet of the vacuum pump it runs into the outer enviroment. Practically the total dust, solid content of the sampled gas settles in the filter.
The dynamic pressure Dp1 in the vicinity of the nozzle (a quantity proportional to the air/gas flow velocity w1) is transmitted to the KS-400-CV.15/8 control unit by the total and static pressure exhaust probes. The adjustment of the velocity of the air w1 @ w2 in the suction nozzle – as a requirement of isokinetic sampling - is solved automatically by a Danfoss frequency converter which provides a signal proportional to the number of revolutions on the basis of the reference data Dp1, pst1, t1.
SPECIAL FEATURES
The sampler probe can be used in different layouts (with different constructions of filters and/or with cascaded preseparators)
Small size inner-space probe head, can be inserted through an opening of Æ 72 [mm] in size.
Extremely high dust storage capacity.
Possibility of controlling the measurement from a distance of 30-50 [m] from the place of sampling
Velocity measurement of the main gas flow simultaneously with the sampling.
Probe shank integrated with static and total pressure probes.
The measurement and the method confirm with the EN ISO 9096 standard and meet many international specifications.
Automatic isokinetic measurement control by Windows-based AR-IZO 404 v4.3 software.
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The main parts of the measurement circuit are shown in Within the cladding tube beside the pipe of the partial gas flow there are two pressure exhaust probes – static and dynamic pressure – and (as an option) a thermometer probe cladding tube.
The measurement control software AR-IZO 404 runs on Windows graphic platform (Figure 5.) with – for the purpose of easy-to-use handling – graphical buttons, pull-down menus and a help system supporting the control of the sampling procedure. The measured data can be saved, earlier measurements can be reloaded, measurement reports can be generated with the program.
Calibration of the sampling probe was – according to ISO 9096 ( D ) - carried out in the laboratory of the Fluid Mechanics Department of the Budapest University of Technology and Economics with the help of the vertical, recirculation type, open test section, GÖTTINGEN type wind tunnel which is used exactly for such calibration processes. Picture of the facility is shown in Figure 4. The main parts of the measurement circuit are shown in Figure 5.
3. Technical data
| 3,0 [m3/h] | |
| 1,7 [m3/h] | |
| 1,7 [m3/h] | |
| 1,7 [m3/h] | |
| 1,0 - 5,0 [m3/h] | |
| 4 - 35 [m/s] standard | |
| 1,2 - 16 [m/s] opció | |
| Æ 4,5; 5,6; 7,6; 10,7; 14; 17 [mm] | |
| Æ 26*60 [mm] | |
| Æ 43 [mm] | |
| 230 V, 50 Hz |
Figure 1.
Figure 2.
Figure 3.
Figure 4.
Figure 5.
