Emerson Rosemount 644h Manuel télécharger pdf (Page 19)

2-9

Rosemount Inc

Multichannel Installations

You can connect several transmitters to a single master power supply, as shown in

Figure 2-8. 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 prevent unwanted charging or discharging of the back-up battery.

Figure 2-8. Multichannel Installations

LCD Meter Installation

The LCD Meter for the 644H transmitter provides local indication of the

transmitter output and abbreviated diagnostic messages governing transmitter

operation. Transmitters ordered with the LCD meter are shipped with the meter

installed. After-market installation of the meter can be performed on Model 644H

transmitters that have a meter connector (transmitter Revision 5.5.2 or later).

After-market installation requires the meter kit (part number 00644-4430-0001),

which includes:

• LCD meter assembly (includes LCD meter, meter spacer, and 2 screws)

• Meter cover with O-ring in place

Figure 2-9. Installing the LCD Meter

Transmitter

No. 1

Transmitter

No. 2

Lead

Readout or

Controller

No. 1*

Readout or

Controller

No. 2*

To Additional

Transmitters

Power

Supply

Backup

Battery

3044-0131A

*Between 250 Ω and 1100 Ω if no load resistor.

Lead

Model 644H

Captive Mounting Screws and Springs

Meter Spacer

LCD Meter

10 pin Connector

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Emerson Rosemount 644h Manuel Page 19

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