Emerson 3051S Dokumentacja Pobierz pdf (Strona 13)

Reference Manual

00809-0100-4001, Rev JA

Section 1: Introduction

November 2012

Introduction

Note

For Rosemount 3051 with F

OUNDATION

™

fieldbus, see Rosemount Product Manual

00809-0100-4774. For Rosemount 3051 with Profibus PA, see Rosemount Product Manual

00809-0100-4797.

1.4 Transmitter overview

The Rosemount 3051C Coplanar

™

design is offered for Differential Pressure (DP), Gage Pressure

(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 Figure 1-1.

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.

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Emerson 3051S Dokumentacja Strona 13