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Manual Supplement
00809-0200-4661, Rev AA
April 2004
Upgrading the Rosemount 8712C to a 8712D
OVERVIEW
DC POWERED UNITS
Figure 1-1. 8712D DC Powered
Transmitter
www.rosemount.com
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 1
DC Powered Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 1
AC Powered Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 2
The Rosemount 8712C and 8712U transmitters are being obsoleted, and
replaced with a new revision, the 8712D. A summary of the improvements
can be found in the Technical Data Sheet (TDS) (00816-0100-4661). The
8712D was developed to be a direct replacement for the 8712C and 8712U.
The 8712D boards can be retrofitted into existing 8712C and 8712U
transmitter housings with minimum changes. The new 8712D boards work
with existing LOI's with no modification. From a service standpoint, there are
two changes to be aware of:
•
The 8712D requires a new DD. This DD has been distributed to
Service. The TDS 00816-0100-4661 includes directions to determine if
the existing 275 DD's need to be upgraded.
•
The 8712D boards come in two versions, AC (8712-0822-0001) and
DC (8712-0822-0010) powered. This eliminates the separate large
transformer previously mounted in the transmitter housing of the AC
powered units.
The 8712D DC (8712-0822-0010) electronics are a drop in replacement for
the electronics used in an 8712C DC powered transmitter.
DC 8712D
Electronics
(8712-0822-0010)
Rosemount 8712D
White
Black
Green
New Wiring Harness (8712-0529-0002)
Terminal
Block
Assembly
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Summary of Contents for Emerson Rosemount 8712C
- Page 1 AC Powered Units ....... . page 2 OVERVIEW The Rosemount 8712C and 8712U transmitters are being obsoleted, and replaced with a new revision, the 8712D. A summary of the improvements can be found in the Technical Data Sheet (TDS) (00816-0100-4661).
- Page 2 Manual Supplement 00809-0200-4661, Rev AA Rosemount 8712D April 2004 AC POWERED UNITS This procedure describes how to upgrade an 8712C AC powered transmitter to the 8712D AC powered electronics. 1. Disconnect power on the transmitter. 2. Remove 8712C Electronics (main board) from transmitter housing. 3.
- Page 3 Manual Supplement 00809-0200-4661, Rev AA Rosemount 8712D April 2004 Figure 1-2. 8712C AC Powered Transmitter 8712C Electronics White Black 8712C Transformer Terminal Block Assembly 8712C Transformer Wiring Green Figure 1-3. 8712D AC Powered Transmitter AC 8712D Electronics (8712-0822-0001) White Black Green Terminal Block...
- Page 4 April 2004 Rosemount and the Rosemount logotype are registered trademarks of Rosemount Inc. PlantWeb is a registered trademark of one of the Emerson Process Management group of companies. All other marks are the property of their respective owners. Emerson Process Management...