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promesstec GmbH
I Niedersachsenstraße 4 I D-48465 Schüttorf I Tel.:+49 (0)5923/ 90 229 0 I Fax:+49 (0)5923/ 90 229 29
E-Mail: [email protected] I Internet: www.promesstec.com
4. Starting, operation
4.1 feature
4.2 Installation in pipeline
In case of detached design, the cable must not be extended or cut
short.
4.3 Outdoor conditions
It is necessary to ensure that the flow sensor is not exposed to weather effects and
that the measured medium cannot freeze in the flow sensor as it would damage the
measuring tube.
In case of outdoor location of the electronic evaluation unit, the manufacturer rec-
ommends using a protective box or a roof to avoid direct solar exposure so that the
evaluation electronics cannot get overheated.
4.4 Disturbance sources
These are the sources disturbing the steady flow of a liquid:
-
Pumps and bends or elbows located closely in series in various planes.
These elements should be at a distance of at least 20´d (“d” stands for inside
diameter of the sensor in mm) before the flow sensor.
-
Sudden variations in the pipe section unless constructed as a cone with angle
α ≤ 16° (where α is the angle between the bevelled walls of the pipe adapter).
-
Incorrectly centred seal, the seal with a mall internal diameter, or the seal
made of soft elastic materials which penetrate into internal section of the pipe
after the flanges have been tightened.
-
Anything that interferes with the flow of liquid, e.g. the thermometer well.
-
Branches, T-pieces, bends, elbows, slide valves, taps, and throttles. Shut-off
valves, control valves, butterfly valves, and check valves. Pipe outlets from
tanks, heat exchangers, and filters.
No strong electromagnetic field must take effect close to the inductive flow sensor
(pick-up).
