Yokogawa ADMAG AXR - Manual (Page 14)

<3. INSTALLATION>
3-2
IM 01E30D01-01EN
(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.EPS
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 pipes first, then support the
flowmeter with the pipes.
(9) Mounting Positions
• Pipes must be fully filled with liquids.
IMPORTANT
If the pipe is empty, the output fluctuates or the
Process Alarm (Signal Overflow) occurs. The
pipe must be fully filled with liquid.
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.
F0304.EPS
(Incorrect) (Correct)
(Incorrect) (Correct)
h
h>0
h>0
h
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.
Valve
(Incorrect) (Correct)
(Incorrect)
(Correct)
F0305.ai
Figure 3.1.5 Avoiding Air Bubbles