Table of Contents
Reference Manual
00809-0100-4728, Rev MB
3.4.4
Multichannel installations
In a HART installation, several transmitters can be connected to a single master power supply, as shown
in
Figure
multichannel installations where several transmitters depend on one power supply and the loss of all
transmitters would cause operational problems, consider an uninterrupted power supply or a back-up
battery. The diodes shown in
back-up battery.
Figure 3-5. Multichannel Installations
A. Transmitter number 1
B. Transmitter number 2
C. Readout or controller number 1
3.4.5
LCD display Installation
The LCD display provides local indication of the transmitter output and abbreviated diagnostic messages
governing transmitter operation. Transmitters ordered with the LCD display are shipped with the meter
installed. After-market installation of the meter can be performed. After-market installation requires the
meter kit (part number 00644-7630-0011), which includes:
LCD display assembly (includes LCD display, meter spacer, and 2 screws)
Meter cover with O-ring in place
Figure 3-6. Installing the LCD Display
D
A. Rosemount 644 Transmitter
B. Mounting screws and springs
C. LCD display
D. LCD display rotation screws
Hardware Installation
3-5. In this case, the system may be grounded only at the negative power supply terminal. In
Figure 3-5
R
Lead
A
R
Lead
R
B
Lead
Between 250 and 1100 if no load resistor.
C
prevent unwanted charging or discharging of the
C
D
To Additional
Transmitters
D. Readout or controller number 2
E. Backup battery
F. dc power supply
A
B
Hardware Installation
July 2016
E
F
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