14
Terminology
Before configuring the A2432 Manifold System, it is important to clearly understand the
terminology used to describe the system and programming. The terms listed below are used
throughout this manual and are important to keep distinct.
Sampling Point
– the physical place in the facility where the sample is being drawn from. Normally
an Isokinetic Probe, sometimes called an “isoprobe” is installed at each sampling point.
Port Number –
the actual fitting on the front of the manifold itself where the tubing from the
sampling point is connected, numbered
01
through
32
.
Scan Steps
– The order of programmed sequence steps set up in the Manifold Controller by the
operator; up to 100 steps, numbered
00
through
99
. These steps may or may not coincide with the
port number. For example, a sequence of scan steps may be programmed in which port number 07 is
the first port sampled by the system. In that case, the first scan step (00) would be port 07.
Cycles
– the
number of samples to be drawn at each port before moving to the next scan step,
programmed at the particle counter.
Locations
– the number of scan steps to be used in a given sampling operation, programmed in the
particle counter. Refer to Table 2
to interpret the following example:
1. A sampling operation is set up with 5
sampling points
. The
sampling points
are connected
to the Manifold at
port numbers
01, 07, 13, 19 and 26.
2. The Manifold Controller is programmed for five
scan steps
(00-04) as shown in the table.
3. The number of
cycles
is set in the Particle Counter to 001, for one sample at each
scan step.
4. The number of
locations
is programmed into the Particle Counter. If the number of
locations
matches the number of
ports
used and
scan steps
, each
port
will be sampled once.
5. A number of
locations
may be programmed into the particle counter which does not match
the number of
ports
used or the number of
scan steps
. If the programmed number of
locations
is fewer than the number of connected
ports
and
scan steps
, some
ports
will not
be sampled.
6. If the programmed number of
locations
exceeds the number of connected
ports
and
scan
steps
, some
ports
will be sampled more than once.
1. Port
No.
01
07 13 19 26
2.
Scan Step No.
00 01
02
03
04
3.
Cycles = 001
1 sample
1 sample
1 sample
1 sample
1 sample
4.
No. of Locations = 005
001 002
003
004
005
5.
No. of Locations = 003
001 002
003
6.
No. of Locations = 007
001 002
003
004
005
006 007
Table 2.
Manifold system programming examples
