7
Introduction
The manifold system consists of a particle counter, manifold, manifold controller, and allows a
single particle counter to sample up to 32 different locations. Each sample location is connected to
the manifold by tubing up to 30 meters in length; and two tubes (one for sample and one for return
air) are connected between the manifold and the counter. The manifold routes the air from each
location to the particle counter in turn. An external vacuum pump maintains a constant airflow in the
system.
A manifold system can scan in any predetermined sequence through any or all manifold ports in any
order, skipping the unused ports. The counter and manifold are usually positioned outside the
cleanroom and may be left unattended to execute the programmed sampling routine, reducing the
need for monitoring personnel to intrude into the cleanroom to collect count data.
The control of the entire system may be assigned to a computer creating a control hierarchy wherein
the Manifold is powered, programmed, and controlled by a Manifold Controller, the Manifold
Controller is controlled by the Particle Counter, which is controlled by the computer, making the
sampling process automatic.
Particle Counter
Four different particle counters are available for use as part of the
manifold system, models A2100, A2200, A2400 and A2408. All
four have two, four, five, or six particle-size channels, but have
different minimum size sensitivity. The counter's internal vacuum
pump draws a 1 cfm sample column from the manifold sample
tube. A built-in printer provides a printout of all data, present or
past. For complete details on operating the counter and for a
complete list of specifications, refer to the operating guide you
received with the counter.
Manifold
The 32-port manifold has been designed for operation only with the
particle counters listed above. The manifold/counter system provides
for random sampling at up to 32 locations through sample tubes. The
manifold is the rotary type requiring an external vacuum pump to
maintain a constant purge air flow during 32-port operation .This flow,
approximately two to three cfm, occurs in all idle tubing. Purging is
accomplished by allowing purge time for each port before counting
begins.
Manifold Controller
The manifold controller houses the control, display, and alarm electronics for
controlling the manifold. It displays sample sequence information and allows
programming of the manifold sampling sequence as well as providing
interface with the optional alarm relay module.
