KROHNE OPTISWIRL 4070 Quickstart EN - Manual (Page 15)

INSTALLATION
2
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OPTISWIRL 4070
www.krohne.com 06/2010 - 4000122102 - QS OPTISWIRL R04 en
2.4.2 Minimum outlet runs
2.4.3 Flow straightener
If, due to the type of installation, the required inlet runs are not available, the manufacturer
recommends using flow straighteners. Flow straighteners are installed between two flanges
upstream of the device and shorten the required inlet run.
Figure 2-9: Minimum outlet runs
1 Upstream of pipe expanders, pipe bends, control valves, etc. ≥ 5 DN
2 Upstream of metering points ≥ 5…6 DN
INFORMATION!
The interior of the pipe at the metering points must be free of burrs and other flow impediments.
The measuring device has an internal temperature sensor. External temperature sensor must
be located ≥ 5 DN behind the flow sensor outlet. Use sensors that are as short as possible to
avoid disturbing the flow profile.
Figure 2-10: Flow straightener
1 Straight inlet run upstream of straightener ≥ 2 DN
2 Flow straightener
3 Straight pipe run between flow straightener and device ≥ 8 DN
4 Minimum straight outlet run ≥ 5 DN
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