General wiring rules
Quick Reference Instruction Manual
Wiring
IM01U10A00-00EN-R, 2nd edition, 2017-08-29
29 / 54
7 Wiring
7.1 General wiring rules
Be sure to handle the transmitter cover carefully so that there are no damages and for-
eign matter adhesion at its thread and O-ring when it is opened or attached.
DANGER
Life-threatening injuries from electric shock
▶ Switch off power supply.
▶ Secure power supply against inadvertent switch-on.
▶ Check that power supply is free of voltage.
DANGER
Life-threatening injuries from ignition of explosive atmospheres
▶ Wait 20 minutes before opening the housing until the capacitors have discharged
and components have cooled off.
▶ Avoid electrostatically charging the device, e.g. by rubbing it with dry cloths.
DANGER
Explosion hazard from electrostatic discharge or brush discharge
Life-threatening injuries or ignition of explosive atmospheres
▶ Avoid actions that could lead to electrostatic discharges. For example, do not wipe
the coated surface of the transmitter using a piece of cloth.
DANGER
When connecting flow meters in hazardous areas, the applicable Ex instruction manual
must be observed.
WARNING
Risk of injury due to electrical shock
▶ Only have skilled personnel to connect the flow meter.
▶ Do not perform wiring outdoors if it is raining.
WARNING
Risk of injury due to electrical shock, as well as sparking and damage to
the flow meter, if an inappropriate connecting cable is used
▶ It is imperative to adhere to the cable diameter of 0.5 – 2.5 mm for sensor and trans-
mitter connection terminals. When using Litz wire, it must be combined with wire end
ferrules.
▶ The outer cable diameter must meet the specification of the cable glands used.
▶ Install cables tension-free.
WARNING
Risk of sparking and damage to the flow meter due to incorrect wiring
▶ Observe connection diagram for the connecting cable according to chapter Connec-
tion terminals of connecting cable [}33] and Connection terminals [}35].
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