<6. Wiring>
6-4
IM 01C25B01-01E
■ Four wire connection
Fasten the negative side wiring of both power
supply and signal line to the SUPPLY - terminal.
Hazardous Location
Nonhazardous Location
Transmitter terminal box
Distributor
(Power supply unit)
Receiver
instrument
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Figure 6.12 Connection between Transmitter,
Distributer and Receiver
6.4.2 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.
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Flexible metal conduit
Wiring metal
conduit
Tee
Drain plug
Apply a non-hardening
sealant to the threads for
waterproofing.
Figure 6.13 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.
Flameproof packing
adapter
Flexible metal conduit
Wiring metal
conduit
Tee
Drain plug
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Figure 6.14 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.
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Non-hazardous area
Hazardous area
Flameproof
heavy-gauge
steel conduit
Tee
Drain plug
Seal fitting
Gas sealing device
Flameproof flexible
metal conduit
After wiring, impregnate the fitting
with a compound to seal tubing.
Figure 6.15 Typical Wiring Using Flameproof Metal
Conduit
