<5. Wiring>
5-1
IM 01C25W05-01EN
5. Wiring
5.1 Wiring Precautions
IMPORTANT
• Lay wiring as far as possible from electrical
noise sources such as large capacity
transformers, motors, and power supplies.
• Remove electrical connection dust cap
before wiring.
• All threaded parts must be treated with
waterproofing sealant.
(A non-hardening silicone group sealant is
recommended.)
• To prevent noise pickup, do not pass signal
and power cables through the same ducts.
• Explosion-protected instruments must
be wired in accordance with specific
requirements (and, in certain countries,
legal regulations) in order to preserve the
effectiveness of their explosion-protected
features.
• For flameproof types, turn the Allen head
bolt clockwise to unlock the cover, and
then remove the cover. See Subsection 8.4
“Disassembly and Reassembly” for details.
5.2 Selecting the Wiring
Materials
• Use stranded leadwires or cables which are
the same as or better than 600 V grade PVC
insulated wire (JIS C3307) or equivalent.
• Use shielded wires in areas that are susceptible
to electrical noise.
• In areas with higher or lower ambient
temperatures, use appropriate wires or cables.
• In environment where oils, solvents, corrosive
gases or liquids may be present, use wires or
cables that are resistant to such substances.
• It is recommended that crimp-on solderless
terminal lugs (for 4 mm screws) with insulating
sleeves be used for leadwire ends.
5.3 Connections of External
Wiring to Terminal Box
5.3.1 Power Supply Wiring Connection
IMPORTANT
Be sure to use a DC power supply with the
appropriate specifications.
The instrument will malfunction if it is connected
to a commercial AC power supply.
Connect the power supply wiring to the
and – terminals.
Load resistor
Power supply
High pressure side transmitter
(master)
Terminal section
F0501.ai
Figure 5.1
Power Supply Wiring Connection
5.3.2 External Indicator Connection
Connect wiring for external indicators to the CHECK
A (+) and SUPPLY – terminals.
IMPORTANT
Use an external indicator whose internal
resistance is 10 Ω or less.
High pressure side transmitter
(master)
Terminal section
F0502.ai
External indicator
Power supply
–
+
Figure 5.2
External Indicator Connection
