IM 1E7D0-01E
3-15
3. INSTALLATION
3.4.3
Cable Types
(1) Dedicated Signal Cable(AM011)
The flow signal is transmitted via this dedicated cable.
The cable is constructed with double shielding over the
two conductors, and used heat-resistant vinyl as the
outer jacket material.
Finished diameter:
10.5 mm (0.413”)
Maximum length:
30 m (98 ft)
Maximum temperature: 80
°
C (176
°
F)
Figure 3.4.1
Dedicated Signal Cable AM011
IMPORTANT
If the cable is longer than required, cut off any
extra length, rather coiling it up, and terminate
the conductors as shown in Figure 3.4.2. Avoid
using intermediate terminal boards to extend the
cable length, or this will interrupt the shielding.
20 (0.8)
ø
10.5 (0.4)
AM011*A
L (SPECIFIED LENGTH)
150
(5.9)
8 (0.3) Max.
150 (5.9)
80 (3.15)
70 (2.76)
90 (3.5)
30 (1.2)
90 (3.5)
50 (1.97)
25 (0.98)
SA
SB
A
C
B
A
C
B
8 (0.3) Max.
(WHITE)
(BLACK)
(RED)
(WHITE)
(BLACK)
(RED)
F030402.EPS
On the converter
side
On the flow tube
side
Figure 3.4.2
Treatment of Dedicated Signal Cable
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 (10.5 to 11.5 mm for
waterproof gland / ECG, /ECU)
Nominal Cross Section
• Single wire; 0.5 to 2.5mm
2
, Stranded wire; 0.5 to
2.5mm
2
60
(2.4)
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
