YOKOGAWA AXG1A Installation Manual page 21

• Installation: Natural soft rubber/Polyurethane
rubber lining type and Metal pipe
When a magnetic flowmeter with natural soft rubber
or polyurethane rubber lining is installed to metal
pipe without lining, the installation method without
grounding ring is recommended.
In the case grounding ring is not used, with grounding
wire (supplied by customer), connect between the
pipe and the sensor flange, or between the transmitter
and the grounding terminal of terminal box. For
grounding in detail, read Subsection 4.4.3.
For gasket A (customer pipe side), use non-asbestos
joint sheet gasket, PTFE-sheathed non-asbestos joint
sheet gasket or gasket with the equivalent hardness.
• Installation without grounding ring
Customer pipe
(Metal)
With grounding wire, connect between the pipe and the sensor flange,
or between the transmitter and the grounding terminal of terminal box.
• Installation with grounding ring
Grounding ring
Customer pipe
(Metal)
A
Gasket A
to be supplied by customer
• Installation: PTFE lining type and Plastic pipe
When a magnetic flowmeter with PTFE lining is
installed to plastic pipe, be sure to use grounding
rings.
For gasket A (customer pipe side), use fluororubber
gasket, chloroprene rubber gasket or gasket with the
equivalent hardness.
For gasket B (sensor side), use fluororubber gasket
(optional code GA, GC or GD) or gasket with the
equivalent hardness.
It is recommended to use gasket with same hardness
for gasket A and B.
Grounding ring
Customer pipe
(Plastic)
A B
Gasket A
to be supplied by customer
Gasket B
to be supplied by customer or by specified optional code
Customer pipe
(Metal)
F0320.ai
Customer pipe
(Metal)
A
F0321.ai
Customer pipe
(Plastic)
B A
F0322.ai
<3. Installation>
(3) Tightening Nuts
Tighten the nuts according to the torque values for the
metal piping in Table 3.3.6. For plastic piping, using the
gaskets for plastic piping (optional code GA, GC or GD),
tighten the nuts according to the torque values in Table
3.3.7.
CAUTION
For a flowmeter with fluorocarbon PTFE lining, it is
possible that the nuts may loosen as time passes,
so tighten them regularly. Be sure to tighten the nuts
according to the prescribed torque values. Tighten them
diagonally with the same torque values, step by step up
to the prescribed torque value.
*Piping-side flange
*Gasket (two units)
*Bolt
*Nut
Figure 3.3.6 Mounting Procedure for Flange Type
(sizes: 25 to 400 mm (1 to 16 in.))
20
*: These items must be
provided by the user. Choose
nuts and bolts in compliance
with the flange ratings.
When the PTFE lining is
specified, the particle board
is attached to the flowmeter.
Do not reuse nuts and bolts
used to attach the particle
board.
Flowmeter-side flange
F0323.ai
IM 01E24A01-01EN