Page 1
Manual Supplement
00809-0200-4661, Rev AA
April 2004
Rosemount 8712D
Upgrading the Rosemount 8712C to a 8712D
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 1
DC Powered Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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). 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.
DC POWERED UNITS The 8712D DC (8712-0822-0010) electronics are a drop in replacement for
the electronics used in an 8712C DC powered transmitter.
Figure 1-1. 8712D DC Powered
Transmitter
DC 8712D
Electronics
(8712-0822-0010)
White
Black
Green
Terminal
New Wiring Harness (8712-0529-0002)
Block
Assembly
8712-07A.EPS
www.rosemount.com
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. Remove 8712C line transformer and wiring harness from transmitter
housing.
4. Install 08712-0529-0002 wiring harness.
5. Install AC powered 8712D electronics (8712-0822-0001).
NOTE
Only use AC power with 8712-0822-0001 electronics.
Table 1-1. 8712-0833-0001 Kit
Contents
Item Number Quantity Description
C119980504-0104 1 SCREW, PHM ZNC PLTD, 8-32,
C091400022 1 FUSE 250V, 1A, QUICK, AGC 1
08712-0667-0111 1 LABEL, WIRING 8712D, AC TERMAL PRINTED
08712-0822-0001 1 CKT CD ASSY 8712D (AC PWR)
C103680031 1 WASHER, METAL LOCK, INT, NO8
C099830007 4 STANDOFF HEX, M-F, SST, 6-32X1/4, X7/8
08712-0529-0002 1 WIRING ASSY 8712D ELECTRONICS, LOCK
08712-0823-0001 1 SHIELD PLASTIC, SNAP-FIT, ABS, BLACK
08712-0571-0004 1 LABEL WARNING, WIRING COMPARTMENT
1
/4, SLF LKG, TP 1
S-2
Page 3
Manual Supplement
00809-0200-4661, Rev AA
April 2004
Figure 1-2. 8712C AC Powered
Transmitter
Rosemount 8712D
8712C
Electronics
White
Figure 1-3. 8712D AC Powered
Transmitter
8712C
Transformer
AC 8712D
Electronics
(8712-0822-0001)
Green
White
Black
8712C Transformer Wiring
Black
Green
8712-06A.EPS
Terminal
Block
Assembly
8712-07A.EPS
New Wiring Harness (8712-0529-0002)
Terminal
Block
Assembly
S-3
Page 4
Rosemount 8712D
Manual Supplement
00809-0200-4661, Rev AA
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
Emerson Process Management
Rosemount Inc.
8200 Market Boulevard
Chanhassen, MN 55317 USA
T (U.S.) 1-800-999-9307
T (International) (952) 906-8888
F (952) 949-7001
www.rosemount.com
Emerson Process Management
Flow
Groeneveldselaan 6-8
3903 AZ Veenendaal
The Netherlands
T 31 (0) 318 549 549
F 31 (0) 318 549 559
T 0800-966 180 (U.K. only)
F 0800-966 181 (U.K. only)
Emerson Process Management
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1 Pandan Crescent
Singapore 128461
T (65) 6777 8211
F (65) 6777 0947
AP.RMT-Specialist@emersonprocess.com
¢00809-0200-46611¤
© 2004 Rosemount Inc. All rights reserved.
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