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51
Reference Manual
00809-0100-4728, Rev MB
July 2016
3.4.4
Multichannel installations
In a HART installation, several transmitters can be connected to a single master power supply, as shown
in
. In this case, the system may be grounded only at the negative power supply terminal. In
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
prevent unwanted charging or discharging of the
back-up battery.
Figure 3-5. Multichannel Installations
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
A. Rosemount 644 Transmitter
B. Mounting screws and springs
C. LCD display
D. LCD display rotation screws
A. Transmitter number 1
B. Transmitter number 2
C. Readout or controller number 1
D. Readout or controller number 2
E. Backup battery
F. dc power supply
A
B
R
Lead
R
Lead
R
Lead
C
D
To Additional
Transmitters
F
E
Between 250
and 1100
if no load resistor.
A
B
C
D
Содержание Rosemount 644 HART
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Страница 16: ...6 Reference Manual 00809 0100 4728 Rev MB Introduction July 2016 Introduction ...
Страница 80: ...70 Reference Manual 00809 0100 4728 Rev MB Operation and Maintenance July 2016 Operation and Maintenance ...
Страница 86: ...76 Reference Manual 00809 0100 4728 Rev MB Troubleshooting July 2016 Troubleshooting ...
Страница 120: ...Product Certifications July 2016 Reference Manual 00809 0100 4728 Rev MB 110 Product Certifications Sheet 2 of 2 ...
Страница 122: ...Product Certifications July 2016 Reference Manual 00809 0100 4728 Rev MB 112 Product Certifications ...
Страница 138: ...128 Reference Manual 00809 0100 4728 Rev MB Index July 2016 Index ...
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