Emerson Rosemount 644h, Reference Manual

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Reference Manual
00809-0100-4728, Rev HA
December 2002
Models 644H and 644R
2-8
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 the
transmitter has 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 display assembly (includes LCD display, meter spacer,
and 2 screws)
• Meter cover with O-ring in place
Figure 2-4. Installing the LCD
Display
Use the following procedure to install the meter.
1. If the transmitter is installed in a loop, secure the loop and disconnect
the power. If the transmitter is installed in an enclosure, remove the
cover from the enclosure.
2. Decide meter orientation (the meter can be rotated in 90°
increments). To change meter orientation, remove the screws located
above and below the display screen. Lift the meter off the meter
spacer. Remove the 8-pin plug and re-insert it in the location that will
result in the desired viewing orientation.
3. Reattach the meter to the meter spacer using the screws. If the meter
was rotated 90° from its original position it will be necessary to
remove the screws from their original holes and re-insert them in the
adjacent screws holes.
4. Line up the 10-pin connector with the 10-pin socket and push the
meter into the transmitter until it snaps into place.
5. Attach the meter cover; tighten at least one-third turn after the O-ring
contacts the transmitter housing. The cover must be fully engaged to
meet explosion-proof requirements.
6. Use a Model 275 HART Communicator or AMS software to configure
the meter to the desired display. Refer to “LCD Meter Options
(Model 644H Only)” for information on configuring the LCD display.
NOTE
Observe the following LCD display temperature limits:
Operating: –4 to 185 °F (–20 to 85 °C)
Storage: –50 to 185 °F (–45 to 85 °C)
Model 644H
Captive Mounting Screws and Springs
Meter Spacer
LCD Display
10 pin Connector