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5. Wiring
Cautionary notes on wiring
urn off mains power
before working on pipes.
Install a switch and fuse
to isolate the LF232
from mains power.
DO
Working on pipes while power is
applied can cause
electric shock
.
DO
Power supply from mains power can
cause electric shock or circuit
break-down.
Do not work on piping and wiring
with wet
hands
.
Ground
the LF232
independently from power
equipment
.
Type D (100 ohm or less ground
resistance)
DON’T
Wet hands may result in
electric
shock
.
DO
Operating this product without
grounding can cause
electric shock
or
malfunction
.
Do not conduct wiring work
with bare hands
.
Use
crimped terminal lugs
for the terminal board
and GND terminal.
DON’T
Remaining electric charge
even if
power is turned off can still cause
electric shock
.
DO
Loose connections can cause
electric
shock, fire from excessive current or
system malfunction
.
Do not modify or disassemble
the LF232
unnecessarily.
DON’T
Modifying or disassembling this
product can cause
electric shock,
malfunction of or damage to this
product
.
The label shown left is placed near
the terminal board for power input.
(A black border and symbol on
yellow triangle)
Be alert to
electric shock
.
Flowmeter performance may be affected by the way wiring is carried out. Proceed with correct wiring
by observing the following items.
(1) For cable route, avoid places near electrical equipment (such as motors, transformers or radio
transmitters) which cause electromagnetic or electrostatic interference.
(2) If the converter interior or cable ends get wet or humidified, deterioration of insulation occurs and
this may cause malfunction or noise problems. Avoid a rainy day if wiring is carried out outdoors.
Even indoors, make arrangements to prevent water from splashing over the converter and try to
finish the wiring as quickly as possible
(3) Since the excitation cable and the flow rate signal cable carry very small signals, pass each of the
cables separately through a thick steel conduit and keep them away from large current wiring as
much as possible, and do not install them in parallel.
