O
PERATION
M
ANUAL
VKL
10
/100
V
ERSION
V005-06-2020
15
6. Operation
6.1. Installation
When installing the dilution system, various tubes need to be connected to transport the
aerosol. In order to minimize the transportation loss, these tubes should be as short and
straight as possible. When diluting aerosols with a particle size bigger than 5 µm or 10 µm,
vertical operation of the dilution stages is recommended to minimize sedimentation loss.
6.1.1. Installation as Single Unit
Figure 6.1. shows the installation of a single dilution stage, showing the coupling of an
optical particle counter (OPC) to an aerosol duct.
The dilution stage must be sturdily placed inbetween the OPC and the aerosol duct. If
necessary, the M5 winding at the bottom side can be used for fixing. Via tube the inlet
nozzle of the VKL is connected to the sampling probe at the duct. In the same manner,
the inlet nozzle of the OPC is connected to the outlet nozzle of the VKL. The excess air is
disposed of (if necessary) by pushing a tube of 28 mm inner diameter onto the excess air
tube connector and then inserting it into the excess air outlet of the VKL. The compressed air
supply is connected to the dilution stage by means of a fast coupling device. After turning on
the VKL with the toggle switch, the pre-pressure is set to the desired value via the pressure
gauge. (see point 6.3).
Now, the measuring instrument can be turned on, and the measurement can be started.
After the measurements are done, it is advisable to turn off the OPC first, and then the VKL.
In case of prolonged non-use, it is recommended to put the four yellow covers on for dust
protection.