Transmitter Overview - Emerson Rosemount 2051 Reference Manual

Reference Manual
00809-0100-4107
1.3

Transmitter overview

The Rosemount 2051C Coplanar
pressure (GP) measurements.
The 2051C uses capacitance sensor technology for DP and GP measurements. The
Rosemount 2051T uses piezoresistive sensor technology for absolute pressure (AP) and
GP measurements.
The major components of the transmitter are the sensor module and the electronics
housing. The sensor module contains the oil-filled sensor system (isolating diaphragm,
oil fill system, and sensor) and the sensor electronics. The sensor electronics are installed
within the sensor module and include a temperature sensor, a memory module, and
the analog-to-digital signal converter (A/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 optional external
configuration buttons, and the terminal block. The basic block diagram of the transmitter is
illustrated in
When pressure is applied to the isolating diaphragm, the oil deflects the sensor which
then changes its capacitance or voltage signal. This signal is then changed to a digital
signal by the signal processing. The microprocessor then takes the signals from the signal
processing and calculates the correct output of the transmitter. This signal is then sent to
the digital-to-analog D/A converter, which converts the signal back to the analog signal,
and then superimposes the HART
You can order an optional LCD display that connects directly to the interface board
which maintains direct access to the signal terminals. The display indicates output and
abbreviated diagnostic messages. Emerson provides a glass display cover. For 4-20 mA
HART output, the LCD display features a two-line display. The first line displays the actual
measured value, and the second line of six characters displays the engineering units. The
LCD display can also display diagnostic messages.
Note
The LCD display uses a 5 × 6 character display and can display output and diagnostic
messages. The local operator interface (LOI) display uses an 8 × 6 character display and can
display output, diagnostic messages, and LOI menu screens. The LOI display comes with
two buttons mounted on the front of the display board. See
Figure 1-2: LCD/LOI display
Emerson.com
design is offered for differential pressure (DP) and gauge
™
Figure 1-3.
signal on the 4–20 mA output.
®
LCD display
Introduction
February 2024
Figure 1-2.
LOI display
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