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Reference Manual
00809-0400-4728, Rev AA
June 2011
2-3
Rosemount 644
MOUNTING Mount the transmitter at a high point in the conduit run to prevent moisture
from draining into the transmitter housing.
The 644 head mount installs:
• In a connection head or universal head mounted directly on a sensor
assembly
• Apart from a sensor assembly using a universal head
• To a DIN rail using an optional mounting clip.
The 644 rail mount attaches directly to a wall or to a DIN rail.
Mounting a 644H to a DIN Rail
To attach a head mount transmitter to a DIN rail, assemble the appropriate rail
mounting kit (part number 00644-5301-0010) to the transmitter as shown in
Figure 2-2.
Figure 2-2. Assembling Rail Clip
Hardware to a 644H
Retrofitting a 644H for Use in an Existing Threaded Sensor Connection
Head
To mount a 644H in an existing threaded sensor connection head (former
option code L1), order the 644H retrofit kit (part number 00644-5321-0010).
The retrofit kit includes a new mounting bracket and all associated hardware
necessary to facilitate the installation of the 644H in the existing head. See
Figure 2-3.
Figure 2-3. Assembling 644H for
Use in an Existing L1
Connection Head
G-Rail (asymmetric) Top Hat Rail (symmetric)
Note: Kit includes Mounting Hardware and both types of Rail Kits.
Transmitter
Mounting
Hardware
Rail Clip
Transmitter
Mounting
Hardware
Rail Clip
Kit includes
replacement bracket
and screws.
Existing Threaded Sensor Connection Head
(Former option code L1)