Yokogawa ADMAG AXW - Manual (Page 21)

<4. WIRING>
4-2
IM 01E25D11-01EN
4.1.2 Cables
(1) Dedicated Signal Cable (AXFC)
Outer jacket 10.5 (0.413")
Tape
Shield (C)
Insulation
Insulation
Shields (SA and SB)
Conductors (A and B)
F0401.ai
Figure 4.1.1 Dedicated Signal Cable AXFC
The flow signal is transmitted via this dedicated
cable. The cable is constructed with double
shielding over the two conductors, and heat-
resistant vinyl is used for the outer jacket material.
Finished diameter: 10.5 mm (0.413”)
Maximum length:
Combination with the AXFA11 converter:
200 m (660 ft)
Maximum temperature: 80°C (176°F)
IMPORTANT
If the cable is longer than required, cut off
any extra length rather than coiling it up, and
terminate the conductors as shown in Figure
4.1.2. Avoid using junction terminal boards to
extend the cable length, as this will interrupt the
shielding.
20 (0.8) ø10.5 (0.4)
AXFC
L (Specified Dimensions)
150
±5
8 (0.3) max.
150
±5
70 (2.76)
60 (2.36) 90 (3.54)
(5.9) (5.9)
55 (2.17)
90 (3.54)
50 (1.97)
25 (0.98)
SA SB
A
C
B A
C
B
8(0.3) max.
White Black Red
White Black Red
F0402.ai
Unit : mm
(approx. inch)
On the
converter
side
On the
flowtube
side
Figure 4.1.2 Treatment of Dedicated Signal Cables
CAUTION
• As crimp terminals A, B, SA, SB and C have
their own electrical potentials, securely
insulate them so as not to come in contact
with one another.
• To prevent a shield from coming in contact
with another shield or the case, cover each
shield with a vinyl tube or wrap it in vinyl tape.
NOTE
Conductors A and B carry the signal from the
electrodes, and C is at the potential of the liquid
(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 distributed 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 finish treatment.
(2) Excitation Cable
JIS C 3401 control cable equivalent
JIS C 3312 power cable equivalent
14 AWG Belden 8720 equivalent
Outer Diameter: 6.5 to 12 mm (0.26 to 0.47 in.)
10.5 or 11.5 mm (0.41 to 0.45 in.) for optional
code EG, EU and EW.
Nominal Cross Section:
Single wire: 0.5 to 2.5 mm 2
Stranded wire: 0.5 to 1.5 mm 2