Introduction
Partisol 2000i-D Configuration
Thermo Fisher Scientific
Partisol 2000
i
and Partisol 2000
i
-D Instruction Manual
1-11
Figure 1–3.
Partisol 2000
i
-D Flow Schematic
The 2000
i
-D maintains two constant volumetric flow rates at the set points
defined by the instrument (15.0 L/min and 1.67 L/min defaults), and reports
sampled volumes (m³) in volumetric and standard terms. The sampling
system determines the ambient temperature and pressure for flow rate
calculations through the use of sensors that provide continually updated
information to the microprocessor system. Two in-line particle trap filters
downstream of the sample filters protect the mass flow controllers from any
particles that may remain in the air flow. The accumulator minimizes
pulsations caused by the vacuum pump.
For size separation, the ambient particles are sampled through a PM
10
size
selective inlet. This impactor-type inlet traps particles that have a diameter
that is equal to or larger than 10 microns while allowing the smaller particles
to move onward toward the virtual impactor or dichotomous splitter. The
dichotomous sampler's virtual impactor then separates the
coarse
and
fine
