IM 01E20D01-01E
8-10
8. EXPLOSION PROTECTED TYPE INSTRUMENT
NOTE
This section describes the integral flowmeter as
an example. The same attention must be paid to
the remote flowtube.
(2-1) Wiring Cable through Flameproof Pack-
ing Adapter
WARNING
For the TIIS flameproof type with wiring using a
flameproof packing adapter, wire cables through
the packing adapters approved by Yokogawa
(optional code G12 or G11).
In case that optional code G11 is selected, it
comes with a blanking plug. Then always apply it
to the unused wiring port.
T1
T2
L
18(0.71)
G
F
D
C
16.5(0.65)
*Packing
(Choose from the table below
depend on cable outside diameter)
Unit : mm
(Approx. inch)
Adapter body(M. Screw)
Packing case
Hexagon socket set screw
O-Ring
Packing *
O-Ring
O-Ring
Washer
Union nut
Packing gland
Clamp ring
Clamp nut
O-Ring
B.coupling
Cable(user's scope)
Hexagon socket set screw
0.26
(0.57)
8.0 to
10.0 (0.31 to 0.39)
10.0 to
12.0 (0.39 to 0.47)
16 8-10
16 10-12
Identification
mark
Weight
kg
(lb)
G9601AM*
Parts
No.
Packing diameter
Cable outer diameter
T1
T2
C
D
L
Dimension
Nominal diameter
G 1/2
G 1/2
35
(1.38)
39
(1.54)
94.5
(3.72)
10.0(0.39)
12.0(0.47)
20.0
(0.79)
F
G
F0807.EPS
*: G 11: 1 unit
G 12: 2 units
Figure 8.4.1
Flameproof Packing Adapter
• Apply a non-hardening sealant to the terminal box
connection port and to the threads on the flameproof
packing adapter for waterproofing.
• Either a flameproof packing adapter or a blanking
plug must be applied to every wiring port.
In case that optional code G11 is selected, it comes
with a blanking plug.
Then always apply it to the unused wiring port.
If the blanking plug is necessary, always purchase it
(parts number: G9330DP) from Yokogawa.
Flameproof
packing adapter
Wiring metal
conduit
Flexible metal conduit
Tee
Drain plug
F0808.EPS
Apply a blanking
plug to the unused
wiring port
Apply a non-hardening
sealant to the threads of these
fittings for waterproofing.
Figure 8.4.2
Typical Wiring Using Flexible Metal Conduit
Follow the procedure below when a flameproof
packing adapter (optional code G12 or G11) is applied.
Refer to Figure 8.4.3.
If a blanking plug is applied, follow the same proce-
dure when the flameproof packing adapter is applied.
CAUTION
Before tighting, confirm cable length from
terminal to flameproof packing adapter when
setting. Once it is tightened, loosening and re-
tightening may damage its sealing performance.
(a) Loosen the locking screw and remove the terminal
box cover.
(b) Measure the cable outer diameter in two directions
to within 0.1 mm.
(c) Calculate the average of the two diameters, and use
packing with an internal diameter nearest to this
value (see the table of Figure 8.4.1).
(d) Screw the flameproof packing adapter into the
terminal box until the O-ring touches the wiring
port (at least 6 full turns), and firmly tighten the
lock nut.
(e) Insert the cable through the union cover, the union
coupling, the clamp nut, the clamp ring, the gland,
the washer, the rubber packing, and the packing
box, in that order.
(f) Insert the end of the cable into the terminal box.
(g) Tighten the union cover to grip the cable. When
tightening the union cover, tighten approximately
one turn past the point where the cable will no
longer move up and down.
Proper tightening is important. If it is too tight, a
circuit break in the cable may occur; if not tight
enough, the flameproof effectiveness will be
compromised.
