Emerson Micro Motion MVD Direct Connect, Руководство по установке

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14 Direct Connect Meters
Installation
3.3 Installing the core processor
See Figure 3-1 for a diagram of the mounting bracket supplied with the core processor.
Both pipe mounting and wall mounting are shown.
Figure 3-1 Remote core processor – Wall mount or pipe mount
Table 3-3 Wire sizes and lengths – MVD Direct Connect installations with I.S. barrier
Span Cable type Wire size Max length
Core processor
to barrier
RS-485 22 AWG (0,35 mm 2 ) or larger 500 feet (150 meters)
Power 22 AWG (0,35 mm 2 ) 300 feet (90 meters)
20 AWG (0,5 mm 2 ) 500 feet (150 meters)
18 AWG (0,8 mm 2 ) 500 feet (150 meters)
Barrier to host RS-485 22 – 18 AWG
(0,35 – 0,8 mm
2
)
1000 ft (300 meters)
Barrier to power
supply
Power 22 AWG (0,35 mm 2 ) 300 feet (90 meters)
20 AWG (0,5 mm
2
) 500 feet (150 meters)
18 AWG (0,8 mm
2
) 500 feet (150 meters)
Notes
• Core processor to barrier wire must be sized to provide a minimum of 15 V at the core processor.
See the discussion in the preceding section.
• Barrier to power supply wiring must be sized to provide a minimum of 19.2 V at the barrier. See
the discussion in the preceding section
Note
This step is required only if the core processor is mounted separately from the sensor. Refer to Figure
2-2 and Figure 2-4 .
Mounting bracket
(wall mount)
Mounting bracket
(pipe mount)