BA / RE 250 / EN / V17-11
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Installation
ca. 200 mm at a selected distance while observing whether the position of the pointer on the
display changes.
● Specify the installation zone regarding a reliable reading of the displayed values and adequate
spacing for servicing.
● An inlet run upstream and an outlet run downstream the device is not necessary in case of a
linear media flow profile. In cases of highly asymmetrical flow profiles, however, additional
measures (e.g. inlet tracks, flow rectifiers) with a length of at least 250 mm could be
appropriate to ensure the measuring accuracy.
● Avoid the installation of unilaterally constricting fittings upstream of the device.
● Ensure that the piping is installed securely to avoid vibration or oscillation of the devices.
● The nominal width of the flowmeter and the connected piping must be identically.
● Use connectors connecting bolts suitable for the particular device version (dimension, pressure
rating).
● Ensure that the clearance between the flanges of the piping corresponds to the device
dimension in addition to two gaskets.
● Before connecting the device, blow or flush out the pipes leading to the device.
● The surface roughness of the flange sealing areas must be appropriate for the used gaskets.
● The gaskets and bolts of the prescribed dimensions must be appropriate for the operating
pressure, the temperature and the media.
●
Do not use carbon steel mounting brackets for the device!
Additionally for devices with PTFE liner:
● Use gaskets which conform to the inner and outer dimensions of the raised face of the
flowmeter.
● Tighten the screws crosswise to ensure the tightness of the process connections. For tightening
torques please refer to Tab. “2.2 Tightening torques”.
● If the instrument is absolutely calibrated for a pressure exceeding 1.013 bar any valve is
usually installed at the rear of the flowmeter, at 1.013 bar absolute (free emanation) in front
of the instrument.
Special issues for measuring gas flow:
● Valves have to be installed downstream of the device if p
abs
>1.013 bar and upstream of the
device if p
abs
=1.013 bar (free outflow).
● Install a throttle just downstream of the device to prevent compression oscillations during
measurement.
● Ensure that the operating pressure for the flowmeter corresponds to the calibration reference
pressure to avoid erroneous measurements.
Tightening torques
The flange bolts for devices with PTFE liner may be tightened with the following torques (acc.
guideline VDI/VDE 3513):
