This requires a vacuum source
from a central vacuum system
or an external vacuum pump
capable of delivering at least
15 inches of Mercury (15 inHg)
at the outlet of the counter. The
vacuum should be confirmed
using an external vacuum
gauge measured directly at the
outlet of the counter.
Connect the vacuum tubing to
the particle counter outlet
shown in the figure. This
requires tubing such as
specified in the optional
accessories table in Chapter 1
or PVC thick-walled tubing.
Models 6201, 6301, and 6501 have an integrated pump so no vacuum
source is needed. For these models, the outlet can be left
disconnected or connected to exhaust tubing with a maximum length
of 3 m (10 ft.).
It is not always possible to
position the particle counter
close to the monitoring location.
In this case sample tubing is
used to carry a sample from a
location close to a critical
process to the particle counter
a short distance away. This
requires tubing such as
specified in the optional
accessories table in Chapter 1.
Tubing length should be kept
as short as possible (no more
than 3 meters or 10 feet when
measuring particles ≥ 1 µm
*
)
with minimum number of bends
(Minimum bend radii is 15 cm
or 6 inches*) to minimize
particle loss. In addition, care
should be taken not to use
tubing that may carry a very
high static charge (such as
Teflon
®
tubing). This will act
like a filter and prevent particles
being sampled into the device.
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