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ELIS PLZEŇ a. s.
4.4
Installation conditions
4.4.1 General principles
Applicable to mechanical installation of the flowmeter are the following rules:
• The protection covers and packaging shall only be removed immediately before the meter installation;
• The arrow on the sensor housing shall point at the positive fluid flow direction;
• In cases of sensor installation into vertical piping the fluid flow direction shall be upwards;
• The piping flanges shall be parallel to one another;
• The inner piping and seal diameters shall correspond to the inner sensor diameter;
• The seals and grounding rings shall be correctly fitted between the flanges and not extend in the
flow profile;
• The piping supports before and after the flowmeter location shall minimise the mechanical stresses
acting on the sensor (vibration, tension, bend and others);
• No piping support shall be located under the meter sensor;
• The transmitter shall be protected from direct sunshine;
• The meter installation location shall be selected so as to ensure easy access for the operator to the
transmitter and all meter rating plates;
• The meter sensor shall always be fully flooded by the measured fluid to avoid aeration;
• In cases of electrically non-conductive piping the measured fluid shall be grounded by means of
grounding rings.
The sensor shall be inserted between the piping flanges by a shifting movement. With larger
sensor sizes it is recommended to use installation inserts. It is also advisable, during the sensor
insertion in the piping, to protect the sealing surfaces on the lining by a metal sheet or similar
material.
Following the meter installation, no subsequent electric-arc welding operations shall be
carried out on the piping at the sensor location. In particular, avoid welding on the piping
flanges connected to the meter sensor.
4.4.2 Straight piping sections
To ensure correct functioning of an electromagnetic flowmeter, conditions shall be provided for
continuous fluid flow and flow profile stability in the meter sensor.
Before and after the meter sensor there shall be straight piping sections the required lengths of which
are specified as multiples of the inner piping diameter. In cases of bi-directional measurements, the
same requirements concern straight piping sections before and after the sensor. If there are flow-
disturbing elements (such as bend or fitting) in the piping near the sensor location, the required length
of straight piping section shall be increased – multiplied by the number of such elements.
At the contact plane between the sensor and the attached piping there shall not be any protruding edges
causing the flow turbulence. The inner diameter of the piping shall not be smaller or greater by more
than 3% than that of the sensor.
Avoid sensor placement at locations where at the sensor input are chemicals (especially chloride
compounds) injected or dosed in the measured fluid. Imperfect blending of the fluid components may
cause errors in the flow rate measurements or, in extreme cases, reduction of the measured flow rate
to nil.
Preferable are flowmeter sensor installation locations before any piping elements affecting the smooth
flow of the measured fluid.
In cases of bi-directional flow measurement, the basic required length of straight piping sections in front
of and behind the flowmeter is 5DN.
ELIS PLZEŇ a. s., Luční 425/15, 301 00 Plzeň, Czech Republic, phone.: +420 377 517 711, fax: +420 377 517 722 Es 90678K
Project design, installation and service manual
Electromagnetic flowmeter FLONET FH30xx
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