Rosemount 751, Справочное руководство

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Reference Manual
00809-0100-4378, Rev CE
Section 1: Introduction
February 2014
3
Introduction
Section 1 Introduction
LCD display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 3
Analog meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 4
Service support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 5
Product recycling/disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 5
The Rosemount 751 Field Signal Indicators provide a means of displaying important process
variables. These devices operate with any two-wire transmitter that measures input variables
such as pressure, flow, liquid level, or temperature. Rosemount indicators are ideal for
installations where an integral meter would be difficult to view.
Rosemount 751 Indicators are designed for use in industrial environments where all-weather
performance is necessary. These units are vibration- and corrosion-resistant, and explo-
sion-proof or intrinsically safe. An LCD display or analog meter may be ordered to meet specific
application requirements.
1.1 LCD display
The LCD display requires an analog 4–20 mA dc output from a two-wire transmitter. It may be
configured from a 4 mA point of –999 to 1000 and a 20 mA point of -999 to 9999. The sum of
the 4 mA point and the span must not exceed 9999. The decimal point can be placed in any of
three positions (X.X.X.X) or not used. Calibration adjustments are made using noninteractive
zero and span buttons. The scaled meter may be labelled with the appropriate engineering
units. A twenty-segment bar graph, on the bottom of the meter faceplate, represents the 4–20
mA signal directly.
The large 2 1 /
4
-inch meter face has 1 /
2
-inch-high characters for easy readability as shown in
Figure 1-1 . The 4 and 20 mA points may be changed by pressing the buttons on the meter
faceplate. The meter can be rotated in 90-degree increments within the enclosure for
convenient viewing.
Figure 1-1. LCD display
LCD display