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Direction of flow
The direction of flow must be taken into account when installing the
measurement fitting. This is shown on the tapping clamp by means
of an arrow (Compac-Air system). The arrow points in the direction
in which the medium in the pipeline flows.
If only the electronic sensor with PBCOver reverse running
protection is used, then make sure the sensor display points
against the direction of flow.
The sensor must be parallel to the direction of flow.
Angular displacement leads to severe measurement
errors.
Required measurement route
Bear in mind the required inflow and outflow routes in order to
achieve the specified measurement accuracy. The inflow route
refers to the pipeline length in front of the mass flow sensor and the
outflow route to the pipeline length behind the mass flow sensor, as
seen in the direction of flow for the medium.
The length of inflow route E depends on the design of the pipeline
upstream of the sensor, vertical (see table below). The outflow
route depends on the pipe diameter. Inflow and outflow routes are
calculated as follows:
Total measurement route = inflow route + outflow route
Outflow route = 5 x D
Inflow route = E (see table below)
D = pipe diameter [mm]
Changes to the pipe
diameter
90° manifold
Two 90° manifolds, one
level
Two 90° manifolds, two
levels
Valve, slider
4 Initial operation
E = 20 x D
E = 20 x D
E = 25 x D
E = 30 x D
E = 50 x D
19
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