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3
RECEPTION
The series M21 flowmeters are supplied conveniently packaged for their protection during
transportation and storage, together with their instructions manual for installation and
operation.
The instruments are supplied tested in our calibration rigs, ready for installation and service.
Before installing the flowmeter, remove all the blocking elements.
With the instrument in its working position, move the float and check that the indicating
needle moves all over the scale and returns to zero.
4
INSTALLATION
Flowmeters models M21 must be installed in a completely vertical position and with upwards
flow direction.
It is important that the position is completely vertical given that deviations of about 5º can
produce errors of about 8-10% of the readings.
4.1
Valves
If the fluid to be measured is a liquid, it is recommended to install a regulating valve before
the flowmeter (see point 5.3), or to use a M21-H... model, which already includes a valve on
the inlet.
For gas flow measurement, the valve position will depend on the calibrating pressure (see
point 5.1).
Valves should always be opened slowly to avoid water hammers.
4.2
Filters
The installation of a filter before the instrument is important, this will avoid possible
obstructions and breakdowns in the measuring system.
The filter mesh should be maximum 200 μm.
In case of having abundant magnetic particles in suspension, it is necessary to mount a
magnetic filter on the inlet of the instrument to avoid the accumulation of particles around the
float, which would make it to jam.
4.3
Straight pipe sections
In order to have stable readings, it is essential to avoid turbulences. To do this, it is
necessary to install the instrument in a straight pipe section. This section should have the
same inner diameter as the flowmeter. The required minimum distances upstream and
downstream of the sensor are the following:
These distances must be free of elements that can disturb the flow profile, such as elbows,
diameter changes, valves, etc.
Upstream
5 DN
Downstream
3 DN
8
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