Rosemount 8732E, Быстрое руководство по установке

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Quick Installation Guide
00825-0100-4662, Rev CB
July 2011
Rosemount 8732
15
S
TEP
6: W
IRING
Conduit Ports and Connections
Both the sensor and transmitter junction boxes have ports for
1
/
2
-inch NPT conduit
connections with optional CM20 or PG 13.5 connections available. These connections
should be made in accordance with national, local, and plant electrical codes. Unused ports
should be sealed with metal plugs. Proper electrical installation is necessary to prevent
errors due to electrical noise and interference. Separate conduits are not necessary for the
coil drive and electrode cables, but a dedicated conduit line between each transmitter and
sensor is required. Shielded cable must be used for best results in electrically noisy
environments. When preparing all wire connections, remove only the insulation required to
fit the wire completely under the terminal connection. Removal of excessive insulation may
result in an unwanted electrical short to the transmitter housing or other wire connections.
For flanged and sanitary sensors installed into an application requiring IP68 protection,
sealed cable glands, conduit, and conduit plugs that meet IP68 ratings are required.
Conduit Cables
Run the appropriate size cable through the conduit connections in your magnetic flowmeter
system. Run the power cable from the power source to the transmitter. Run the coil drive
and electrode cables between the sensor and transmitter. Prepare the ends of the coil drive
and electrode cables as shown in Figure 14. Limit the unshielded wire length to 1-inch on
both the electrode and coil drive cables. Excessive lead length or failure to connect cable
shields can create electrical noise resulting in unstable meter readings.
• Installed signal wiring should not be run together and should not be in the same cable
tray as AC or DC power wiring.
• Device must be properly grounded or earthed according to local electric codes.
• Rosemount combination cable model number 08712-0752-0001 (ft) or
08712-0752-0003 (m) is required to be used to meet EMC requirements.
Powering the Transmitter
This wiring section covers supplying power to the transmitter, the connections between the
sensor and the transmitter, and the 4-20 mA loop.
Connect power to the transmitter according to national, local, and plant electrical
requirements. For AC power applications (90-250 VAC, 50-60 Hz) connect AC Neutral to
terminal 9 (AC N/L2) and connect AC Line to terminal 10 (AC/L1). For DC power
applications, connect negative to terminal 9 (DC -) and positive to terminal 10 (DC +). Units
powered by 12-42 V DC power supply may draw up to 1 amp of current. Follow the supply
wire and disconnect requirements on the next page.
4662RevCBQIG.fm Page 15 Wednesday, July 6, 2011 3:41 PM