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Wiring the Analog outputs versionFigure 3-1:
mA1+
HART
RS-485
PWR
mA2
AA
B
RS-485 A
RS-485 B
C
D
B
B
A
A
A
A. 24 VDC
B. R
load
(250 Ω resistance)
C. HART-compatible host or controller; and/or signal device
D. Signal device
Note
For operating the milliamp outputs with a 24V supply, a maximum total loop resistance of 657
Ω
is
allowed.
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
Installation Manual 31