Valves; Filters; Straight Pipe Sections - Techfluid SC250H Instruction Manual

It is important that the position is completely horizontal or vertical (depending on the model
of the instrument), 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).
In 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 mesh of the filter should be maximum 2 mm.
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
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