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LF502
4
„
Dimensions (Converter)
Figure 5. Converter Dimensions
„
Piping Precautions
(1) Flange connection
The flowmeter has upstream and downstream
flanges on the ends of detector pipe. Connect
these flanges with the flanges on both sides of
pipeline bore using connection bolts after
inserting a packing between them. See Figure 6.
Tighten the bolts in even increments diagonally
across.
Figure 6. Flange Connection
(2) Required straight pipe length
The straight pipe length is required to prevent
uneven flow velocity and a disturbance on the
fluid surface in the detector pipe. The required
straight pipe length should be as follows:
• Downstream side: L = 5D minimum
• Upstream side: L = 10D minimum
where,
L = straight pipe length (straight pipeline length
+ half length of detector pipe length)
Note:
The length of reducers, if used, can be
counted as a part of straight pipe length.
Figure 7. Required Straight Pipe Length on
Upstream and Downstream Sides
„
External Connections
Figure 8. Converter Terminal Connections
Figure 9. Detector Terminal Connections
„
Wiring Precautions
(1)
Be sure to use thick walled steel conduit (22
mm) for signal and excitation cable wiring
between the detector and converter. The
conduit screw is R(PT)1/2. Use flexible
conduits at the cable outlets of the detector as
needed.
(2)
Make the grounding wire as short as possible.
Do not use a common ground shared with other
equipment where earth current may flow.
An
independent
earth
ground
is
recommended.
Four-Dia. 12 holes
Unit: mm
Mass: approx. 18 kg
(including mounting bracket)
Signal cable
(2-wire shielded
sheathed cable)
Excitation cable
(3-wire sheathed cable)
Digital I/O cable
(multi-wire
shielded cable)
Current output cable
(2-wire shielded cable)
Power cable
(2-wire cable)
Grounding
terminal
(M6 screw)
Intermediate
voltage (IV)
wire, 5.5 mm
2
minimum
100 • or less
ground resistance
Flow regulation
valve etc1
Observation window
Detector
10D minimum
5D minimum
Thick walled steel conduits
Excitation cable (3-wire sheathed cable)
Detector
Signal cable (2-wire shielded sheathed cable)
Observation window
Observation
window
Upstream
flange
Downstream flange
Flow direction
Packing