YOKOGAWA ADMAG AM100D, Руководство пользователя

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IM 1E6D0-01E 3-17
3. INSTALLATION
CAUTION
Since A, B, SA, SB, and C all operate at differ-
ent electrical potentials, securely insulate them
from each other so they do not touch.
The shields must not be allowed to touch each
other or to touch the case.
Cover each shield with vinyl tube or wrap in vinyl
tape.
NOTE
Conductors A and B carry the signal from the
electrodes, and C is at the potentials of the liquid
it self (signal common) . Shields SA and SB are
kept at the same potentials as the individual
electrodes (these are actively driven shields).
This is done to reduce the effect of the distrib-
uted capacitance of the cable at long cable
length. Note that, since the signals from the
individual electrodes are impedance converted
inside the converter, errors will result if they
come in contact with any other component.
Great care must be taken in the cable end
treatment.
(2) Excitation Cable
Please use Polyvinyl chloride insulated and sheathed
control cables (JIS C3401) or Polyvinyl chloride
insulated and sheathed portable power cables (JIS
C3312) or equivalents.
Outer Diameter
• 6.5 to 12mm in diameter (7.5 to 12 mm for water-
proof gland / ECG, /ECU, /ECW)
Nominal Cross Section
• Single wire; 0.5 to 2.5mm
2
, Stranded wire; 0.5 to
2.5mm 2
85
(3.3)
85
(3.3)
EX1 EX2
EX1
EX2
On the converter side On the flow tube side
Unit: mm (inch)
F030403.EPS
Figure 3.4.3 End Treatment of Excitation Cable
3.4.4 Connnection to AM11Magnetic
Flow Converter
Connect the flow tube and converter in the following
method.
EX1 EX2
Dedicated signal cable
AM011-2
EX2
EX1
A
B
C
C SA A B
SB
AM11
converter
Flow tube
SA
Converter
Terminal
Flow tube
A
SB
C
EX1
EX2
B
A
C
EX1
EX2
B
(See Note below)
(See Note below)
Note: Terminate those shielding wire terminal
using insulating tape.
F030404.EPS
Figure 3.4.4 Connection