IM 01C25R01-01E
7-3
7. WIRING
(2) Intrinsically Safe Type
With the intrinsically safe type, a safety barrier must be
included in the loop. Followings are wiring examples.
• Analog Output
SUPP
LY
PU
LS
E
CHEC
K
ALAR
M
Hazardous Location
Nonhazardous Location
Transmitter terminal box
Receiver instrument
(and power supply)
Safety barreir
(Isolation type)
F0709E.EPS
Anaolg input
Power
supply
• Simultaneous Analog-Pulse Output
SUPP
LY
PU
LS
E
CHEC
K
ALAR
M
Hazardous Location
Nonhazardous Location
Transmitter terminal box
Safety barrier
(Isolated type)
I/O module
F0710E.EPS
Safety barrier
(Isolated type)
Power
supply
Power
supply
Analog input
Pulse input
Figure 7.7
Connection between Transmitter, barrier and
receiver
7.5.2 Wiring Installation
(1) General-use Type and Intrinsically Safe
Type
With the cable wiring, use a metallic conduit or
waterproof glands.
• Apply a non-hardening sealant to the terminal box
connection port and to the threads on the flexible
metal conduit for waterproofing.
F0711E.EPS
Flexible metal conduit
Wiring metal
conduit
Tee
Drain plug
Apply a non-hardening
sealant to the threads for
waterproofing.
Figure 7.8 Typical Wiring Using Flexible Metal Conduit
(2) Flameproof Type
Wire cables through a flameproof packing adapter, or
use a flameproof metal conduit.
Wiring cable through 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.
Flameproof packing adapter
Flexible metal conduit
Wiring metal
conduit
Tee
Drain plug
Apply a non-hardening
sealant to the threads for
waterproofing.
F0712E.EPS
Figure 7.9 Typical Cable Wiring Using Flameproof
Packing Adapter
Flameproof metal conduit wiring
• A seal fitting must be installed near the terminal box
connection port for a sealed construction.
• Apply a non-hardening sealant to the threads of the
terminal box connection port, flexible metal conduit
and seal fitting for waterproofing.
F0713E.EPS
Non-hazardous area
Hazardous area
Flameproof
heavy-gauge
steel conduit
Tee
Drain plug
Seal fitting
Gas sealing device
Flameproof flexible
metal conduit
Apply a non-hardening
sealant to the threads of
these fittings for
waterproofing
After wiring, impregnate the fitting
with a compound to seal tubing.
Figure 7.10
Typical Wiring Using Flameproof Metal
Conduit
7.6 RTD Cable Connection
Connection of the RTD cable is always required to
measure external temperature. Follow the procedures
below to connect and disconnect a cable when a cable
gland or a conduit is used.
7.6.1 Connecting Shielded Cable with
Cable Gland
(External temperature input code:
-1, -2, -3, and -4)
