TSI Instruments 3079A, Operation And Service Manual, Page: 35 / 39

Appendix
Model 3079A 7-9
Characteristics of the Model 3079A
Depending on the volume flow of the Model 3079A specified by the selected valve position, the
following performance characteristics have been determined to be seen in the table. The values were
determined with the substance DEHS and a particle counter, measuring range 0.3 to 20 µm.
Flow rate
Generation
of particles
> 0.3 µm
fractions sufficient for
0.3 to
0.5 µm
0.5 to
0.7 µm
0.7 to
1.5 µm
>1.5
µm
Filter area
of
Volume
flow of
L/h SKT #/min % % % % m² m³/h
310 40
2.65•10
10
52.26 25.38 19.82 2.53 13.6 19600
295 30
2.58•10
10
52.48 25.23 19.74 2.55 13.3 19200
275 25
2.42•10
10
52.33 25.19 19.97 2.51 12.4 17900
235 20
2.04•10
10
51.49 25.27 20.60 2.65 10.3 14900
190 15
1.58•10
10
49.66 25.28 22.12 2.94 7.7 11100
142 10
9.27•10
9
46.74 24.98 24.33 3.94 4.2 6100
95 5
1.44•10
9
39.91 23.46 29.27 7.36 0.6 800
70 2
1.43•10
8
36.83 22.66 31.48 9.03 0.05 75
The Model 3079A can cover a wide particle production range. From the above table it can be seen
that the maximum concentration is up to 300 times the minimum concentration.
For calculations regarding the verification of laminar flow boxes a filter outlet velocity of 0.4 m/s and a
particle concentration of 1.2

10
6
#/cf was assumed. Only particles of the size 0.3 to 0.5 µm were taken
into consideration.