KROHNE H250 M40 EN - Manual (Page 19)

INSTALLATION
3
19
H250 M40
www.krohne.com 11/2012 - 4000640702 MA H250 M40 R02 en
3.3 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. For installation recommendations please refer also to VDI/VDE 3513
Sheet 3.
H250Hs are installed horizontally and H250U devices are installed vertically with the flow
direction from top to bottom.
• A straight unimpeded inlet run of ≥ 5x DN upstream of the device and a straight outlet run of
≥ 3x DN downstream of the device are recommended.
• 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 inside diameter of the flange deviates from the standard dimensions. Flange seal
standard DIN 2690 can be applied without any limitation.
• 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, see 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.
• Pipes for gas flow need to be dried before the device is installed.
• Use connectors suitable for the particular device version.
• Align the pipes 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.
MA_H250_M40_R02_en_640702_PRT.book Page 19 Wednesday, November 28, 2012 12:23 PM