Transmitter Overview - Emerson Rosemount 3051 Reference Manual

Reference Manual
00809-0100-4001, Rev JA
Note
For Rosemount 3051 with F
00809-0100-4774. For Rosemount 3051 with Profibus PA, see Rosemount Product Manual
00809-0100-4797.
1.4

Transmitter overview

The Rosemount 3051C Coplanar
(GP) and Absolute Pressure (AP) measurements. The Rosemount 3051C utilizes Emerson
Process Management capacitance sensor technology for DP and GP measurements.
Piezoresistive sensor technology is utilized in the Rosemount 3051T and 3051CA
measurements.
The major components of the Rosemount 3051 are the sensor module and the electronics
housing. The sensor module contains the oil filled sensor system (isolating diaphragms, oil fill
system, and sensor) and the sensor electronics. The sensor electronics are installed within the
sensor module and include a temperature sensor (RTD), a memory module, and the
capacitance to digital signal converter (C/D converter). The electrical signals from the sensor
module are transmitted to the output electronics in the electronics housing. The electronics
housing contains the output electronics board, the local zero and span buttons, and the
terminal block. The basic block diagram of the Rosemount 3051CD is illustrated in
For the Rosemount 3051C design pressure is applied to the isolating diaphragms, the oil
deflects the center diaphragm, which then changes the capacitance. This capacitance signal is
then changed to a digital signal in the C/D converter. The microprocessor then takes the signals
from the RTD and C/D converter calculates the correct output of the transmitter. This signal is
then sent to the D/A converter, which converts the signal back to an analog signal and
superimposes the HART signal on the 4-20 mA output.
Introduction
™
fieldbus, see Rosemount Product Manual
OUNDATION
™
design is offered for Differential Pressure (DP), Gage Pressure
Section 1: Introduction
November 2012
Figure 1-1.
3