Reference Manual
00809-0100-4360, Rev BA
August 2008
Rosemount 1151
6-2
RETROFITTING
OVERVIEW
The procedure for retrofitting a transmitter is divided into three parts:
1. Removing the analog electronics assembly.
2. Installing the smart electronics kit.
3. Characterizing the retrofitted transmitter.
Two tools are required to remove the analog electronics and to install the
smart electronics:
• Flat-bladed screwdriver
•
1
/4-in. nut driver or wrench
The following equipment is needed to characterize the retrofitted transmitter:
• A HART Communicator
• An accurate pressure source, preferably 0.025% accuracy or better
• A 250 ohm resistor
The Smart Retrofit Kit, P/N 01151-0935-0001, contains the following items:
REMOVING THE
ANALOG ELECTRONICS
ASSEMBLY
Confirm the output code of the Rosemount 1151 is analog (4-20 mA). It will
have an “E” in the eighth character in the model number on the transmitter
nameplate.
Example: (1151DP4 E 12M1)
The following steps describe how to remove the analog electronics assembly
from transmitters with “E” output code for smart retrofitting. However, they can
also be used as guidelines for retrofitting transmitters with “A” or “C” output
codes. This process requires opening the electronics compartment on the
circuit side of the transmitter and removing the amplifier or amplifier/squaring
assembly, standoffs, and the calibration board.
NOTE
Numbers in parentheses indicate parts shown in Figure 6-1.
Quantity Description
1 Smart electronic assembly
1 Electronics cover
1 Cover O-ring
2 Terminal eyelets
2 Board spacers
2 Standoffs
Use proper earth grounding techniques when handling the smart electronics assembly.
The smart electronics assembly is potentially sensitive to electric static discharge.
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