Filter
Top Products
3.4.1 Wire external HART devices in an explosion-proof/
flameproof or non-hazardous area
Wiring external devices in an explosion-proof/flameproof or non-hazardous areaFigure 3-6:
250 Ω
24 VDC
mA1+
HART
A
B
C
E
D
A. HART Device 1
B. HART Device 2
C. HART Device 3
D. Meter (mA+/HART output)
E. HART/Field Communicator
CAUTION!
• To meet the EC Directive for EMC (Electromagnetic Compatibility), it is recommended that the meter be connected
using a suitable instrumentation cable. The instrumentation cable should have individual screen(s), foil or braid
over each twisted pair and an overall screen to cover all cores. Where permissible, the overall screen should be
connected to earth at both ends (360° bonded at both ends). The inner individual screen(s) should be connected at
only one end, the controller end.
• Metal cable glands should be used where the cables enter the meter amplifier box. Unused cable ports should be
fitted with metal blanking plugs.
Wiring
40 Micro Motion Fork Viscosity Meter