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.
2
5
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Instruction Manual
Tek-Flex
4100A
