KROHNE OPTISWIRL 5080 Handbook page 38

ELECTRICAL CONNECTIONS
4
To wire one or more flowmeters to a power supply, proceed with the following steps.
• Remove the cover from the field terminals compartment.
• Run signal wires (0.50 mm
connections. Use twisted pair to protect the 4...20 mA output and/or remote communications
from electrical noise. Maximum recommended length for signal wires is 1800 m / 6000 ft.
INFORMATION!
Do not run flowmeter wires in same conduit as mains (AC power) wires.
• If shielded cable is used, ground the shield at the negative terminal of the power supply.
Do not ground the shield at the flowmeter.
• Plug the unused conduit opening with the 1/2 NPT or M20 metal plug provided (or equivalent).
To maintain specified explosionproof and dust-ignitionproof protection, plug must be engaged
a minimum of five full threads for 1/2 NPT connections; seven full threads for M20
connections.
• The flowmeter is equipped with an internal and external ground connection. Connect a ground
wire to either terminal in accordance with local practice.
CAUTION!
If the loop is grounded, it is preferable to do so at the negative terminal of the DC power supply.
To avoid errors resulting from earth loops or the possibility of short-circuiting groups of
instruments in a loop, there should be only one earth in a loop.
• Connect the power supply and receiver loop wires to the "+" and "-" terminal connections.
• Connect receivers (such as controllers, recorders, indicators) in series with power supply and
flowmeter as shown in next figure.
• Install the cover onto the flowmeter. Turn the cover to seat the O-ring into the housing and
continue to hand tighten until the cover contacts the housing metal-to-metal.
• If wiring additional flowmeters to the same power supply, repeat steps 1 through 8 for each
additional flowmeter.
• A HART communicator or PC-based configurator can be connected in the loop between the
flowmeter and the power supply. Note that a minimum of 250 Ω must separate the power
supply from the HART communicator or PC-based configurator.
38
2
or 20 AWG, typical) through one of the flowmeter conduit
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OPTISWIRL 5080
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