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
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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