YOKOGAWA Admag AXW, Руководство пользователя, Страница: 11 / 52

<3. INSTALLATION>
3-2
IM 01E25D11-01EN
(5) Precautions for Use of Liquid Sealing
Compounds
IMPORTANT
Care must be taken in using liquid sealing
compounds on the piping, as it may have a
negative influence on the flow indications by
flowing out and covering the surfaces of an
electrode or grounding ring. In particular, care
must be taken if a liquid sealing compound is
used in the case of vertical piping.
(6) Service Area
Select locations where there is adequate space to
service installing, wiring, overhauling, etc
(7) Bypass Line
It is recommended to install a bypass line to facilitate
maintenance and zero adjustment.
Bypass valve
Block valve
Block valve
F0303.ai
Figure 3.1.3 Bypass Line
(8) Supporting the Flowmeter
CAUTION
Do not secure the flowmeter separately to
prevent the vibrations, shocks, and expansion
and contraction forces of the piping from
affecting it. Fix the pipeline or its flanges first,
then let them support the flowmeter.
For vertical, mounting, make sure that the weight
of piping does not weigh on the flowmeter.
To release the load from tightening the flowmeter
to the pipeline, set a expansive pipe in the
downstream side.
(9) Mounting Positions
• Pipes must be fully filled with liquids.
IMPORTANT
It is essential that pipes remain fully filled at
all times, otherwise flow rate indications may
be affected and measurement errors may be
caused.
Piping shall be designed so as to maintain the
interior of the flowtube filled with fluids.
Vertical mounting is effective in such cases as
when fluids tend to separate or solid matter may be
precipitated. When employing vertical mounting,
direct the fluids from the bottom to the top to ensure
that the pipes remain fully filled.
h
h>0
h>0
h
F0304.ai
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Figure 3.1.4 Mounting Positions
• Avoid air bubbles.
IMPORTANT
If air bubbles enter a measurement pipe,
flow rate indications may be affected and
measurement errors may be caused.
In cases where fluids contain air bubbles, piping must
be designed to prevent them from accumulating in
the measurement pipe of a flowtube.
If a valve exists near the flowmeter, try to mount the
flowmeter on the valve’s upstream side in order to
prevent a possible reduction of pressure inside the
pipe, thereby avoiding the possibility of air bubbles.
F0305.ai
Valve
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(Correct)
Figure 3.1.5 Avoiding Air Bubbles