Model 11-R
GRIMM AEROSOL TECHNIK GmbH & Co.KG Seite 78 von 83
Removing the suction head from the sample intake
7.4.2 Clean room sample collection heads with stand (model 1151A)
APPLICATION: For measurements in the flow range up to 4 m/s where the air is flowing at a relatively
constant speed and in a defined direction, for example downstream from filter systems or in laminar flow
boxes.
Representative sample collection for particle measurements requires isokinetic partial flow sampling.
This state is only given when the main and partial stream have the same speed. The sample collector
has four different nozzles suitable for speeds of 0.5, 1, 2 and 4 m/s. Select the suitable nozzle after
measuring the air speed at the measuring point. The sample collection opening always has to face fron-
tally into the airflow. Either insert the sample collector directly into the sample intake on the measuring
device, or mount it on the stand in a corresponding location. In the latter case, the sample collector is
connected to the measuring device with a hose that is as short as possible to keep particle losses due
to sedimentation to a minimum.
The following intake nozzles are available according to the air discharge speed:
-Red nozzle: up to 0.5 m/s
-Gold nozzle: 0.5 to 1.0 m/s
-Green nozzle: 1.0 to 2.0 m/s
-Blue nozzle: 2.0 to 4.0 m/s
Separate installation instructions are provided for this application.
Using a finger or small tool (Figure 7-6), push on the
blue sealing lip for removal of the suction head and
pull slightly on the shaft to take the suction head out of
the sample intake (Figure 7-7).
Figure 7-6:Removing the suction
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