Endress+Hauser prosonic flow 92, Руководство по эксплуатации

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3 Installation Prosonic Flow 92
16 EHauser
3.2.6 Sensor arrangement (Clamp On)
The transmitter offers a number of options between 1 and 4 traverses for the type of
installation. Please note that the signal strength is reduced with each additional reflec-
tion point in the pipe. (Example: 2 traverses = 1 reflection point)
To achieve the best signal quality possible, choose the least number of traverses
required for a sufficient transit time difference.
Fig. 8: Sensor arrangement (Clamp On)
1 = 1 traverse, 2 = 2 traverses, 4 = 4 traverses
Recommendations:
Due to their design and properties, the Prosonic Flow sensors are particularly suited to
certain nominal diameter ranges and pipe wall thicknesses. For this reason, various
sensor types are offered for Prosonic Flow W, P and U for these different applications.
Recommendations for sensor installation can be found in the following table.
* see note below
!
Note!
•
The installation of Clamp On sensors is principally recommended in the 2 traverse
type of installation. This type of installation allows the easiest and most comfortable
type of mounting and means that a system can also be mounted even if the pipe can
only be accessed from one side.
•
If the pipe nominal diameter is small (DN 60 and smaller), the sensor spacing with
Prosonic Flow W/P can be too small for an installation with 2 traverses. In this case,
the 4 traverse type of installation must be used. In all other instances, the 2 traverse
configuration is the preferred method.
•
The use of Prosonic Flow W/P sensors DN 100...4000 is principally recommended for
pipes with a wall thickness >4 mm, pipes made of composites such as GRP, pipes
with lining, even for nominal diameters < DN 100. This applies also to applications with
media with high acoustic damping. For these applications, we principally recommend
mounting the W/P sensors with 1 traverse configuration.
•
In the DN 15...50 nominal diameter range, Prosonic Flow U is preferred for use on
plastic pipes. Both the Prosonic Flow W/P and the Prosonic Flow U sensor types can
be used in the DN 50...100 nominal diameter range. The use of Prosonic Flow W/P
sensors is principally recommended for applications as of DN 60.
•
If the measuring device displays an insufficient signal strength, reduce the number of
the traverses.
Sensor type Nominal diameter Type of mounting
Prosonic Flow U DN 15...100 2 traverses
Prosonic Flow W
Prosonic Flow P DN 50...60
DN 80...600
DN 650...4000 2 (or 4) traverses*
2 traverses
1 traverse
1 2 4
F
0
6
-9
x
x
xxxxx
-0
5
-1
5
-xx-xx
-0
0
2