KROHNE OPTIFLEX 1300C EN - Manual (Page 28)

3
INSTALLATION
28
OPTIFLEX 1300 C
www.krohne.com 03/2014 - 4000172306 - HB OPTIFLEX 1300 R07 en
3.6.3 Standpipes
Use a standpipe if:
• There is highly conductive foam in the tank.
• The liquid is very turbulent or agitated.
• There are too many other objects in the tank.
• The device is measuring a liquid (petro-chemicals) in a tank with a floating roof.
Figure 3-17: Basic installation recommendations for standpipes (stilling wells and bypass chambers)
1 Stilling well
2 Bypass chamber
3 Air circulation hole
4 Level of the liquid
CAUTION!
Installation requirements
• The standpipe must be electrically conductive.
• The standpipe must be straight. There must be no sudden changes in internal diameter
greater than 1 mm / 0.04
¨ .
• The standpipe must be vertical.
• Recommended surface roughness: < ± 0.1 mm / 0.004 ¨ .
• Stilling well only: The bottom of the stilling well must be open.
• Adjust the probe to the center of the standpipe.
• Make sure that there are no deposits at the bottom of the standpipe.
• Make sure that there is liquid in the standpipe.
INFORMATION!
Standpipes are not necessary for devices with coaxial probes. But if there is a sudden change in
diameter in the standpipe, we recommend that you install a device with a coaxial probe.