INSTALLATION
3
21
H250 M40
www.krohne.com
03/2020 - 4000640706 - MA H250-M40 R06 en
3.4 Installation conditions
CAUTION!
When installing the device in the piping, the following points must be observed:
•
The variable area flowmeter must be installed vertically (measuring principle).
Flow direction from bottom to top.
H250Hs are installed horizontally and H250U devices are installed vertically with the flow
direction from top to bottom.
•
A straight unimpeded inlet run of
≥
5 DN upstream of the device and a straight outlet run of
≥
3 DN downstream of the device are recommended. Especially for devices equal or bigger
than DN50 / 2" in order to minimise wear by turbulent float movements.
•
Screws, bolts and gaskets are to be provided by the customer and must be selected in
accordance with the pressure rating of the connection or the operating pressure.
•
The inner diameter of the flange deviates from the standard dimensions. Flange seal
standard DIN 2690 or ASME B16.21 can be applied.
•
Align the gaskets. Tighten the nuts with the tightening torques of the appropriate pressure
rating.
For devices with PTFE liner or ceramic liner and PTFE raised faces, refer to chapter
"Tightening torques".
•
Control devices are to be positioned downstream of the measuring device.
•
Shutoff devices are preferably to be positioned upstream of the measuring device.
•
Before connecting, blow or flush out the pipes leading to the device.
•
Piping for gas flow need to be dried before the device is installed.
•
Use connectors suitable for the particular device version.
•
Align the piping centrically with the connection bores on the measuring device so they are
free of stresses.
•
If necessary, the piping has to be supported to reduce the vibrations transmitted to the
measuring device.
•
Do not lay signal cables directly next to cables for the power supply.