BA RE 250 EN 18-01 www.mecon.de Pa e 9 / 32
Installation
ca. 200 mm at a selected distance while observin whether the position of the pointer on the
display chan es.
● Specify the installation zone re ardin a reliable readin of the displayed values and adequate
spacin for servicin .
● 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 hi hly asymmetrical flow profiles, however, additional
measures (e. . inlet tracks, flow rectifiers) with a len th of at least 250 mm could be
appropriate to ensure the measurin accuracy.
● Avoid the installation of unilaterally constrictin fittin s upstream of the device.
● Ensure that the pipin is installed securely to avoid vibration or oscillation of the devices.
● The nominal width of the flowmeter and the connected pipin must be identically.
● Use connectors connectin bolts suitable for the particular device version (dimension, pressure
ratin ).
● Ensure that the clearance between the flan es of the pipin corresponds to the device
dimension in addition to two askets.
● Before connectin the device, blow or flush out the pipes leadin to the device.
● The surface rou hness of the flan e sealin areas must be appropriate for the used askets.
● The askets and bolts of the prescribed dimensions must be appropriate for the operatin
pressure, the temperature and the media.
● Do not use carbon steel ounting brackets for the device!
Additionally for devices with PTFE liner:
● Use askets which conform to the inner and outer dimensions of the raised face of the
flowmeter.
● Ti hten the screws crosswise to ensure the ti htness of the process connections. For ti htenin
torques please refer to Tab. “2.2 Ti htenin torques”.
● If the instrument is absolutely calibrated for a pressure exceedin 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 easuring 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 durin
measurement.
● Ensure that the operatin pressure for the flowmeter corresponds to the calibration reference
pressure to avoid erroneous measurements.
Tightening torques
The flan e bolts for devices with PTFE liner may be ti htened with the followin torques (acc.
uideline VDI/VDE 3513):
