Emerson 644 Specifications Page 130

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Reference Manual
00809-0200-4728, Rev RA
Appendix A: Specifications and Reference Data
April 2015
Specifications and Reference Data
A.5.2 Physical specifications
Electrical connections
Field Communicator connections
Materials of construction
Stainless steel housing for biotechnology, pharmaceutical industries, and
sanitary applications
Housing and Standard Meter Cover
316 SST
Cover O-ring
Buna-N
Mounting
The 644H installs in a connection head or universal head mounted directly on a sensor
assembly, apart from a sensor assembly using a universal head, or to a DIN rail using an optional
mounting clip.
Special mounting considerations
See “Mounting Kits for 644 Head Mount” on page 105 for the special hardware that is available
to:
Mount a 644H to a DIN rail. (see page 103)
Retrofit a new 644H to replace an existing 644H transmitter in an existing threaded sensor
connection head.
Model Power and sensor terminals
644H Compression screws permanently fixed to terminal block
Communication terminals
644H Clips permanently fixed to terminal block
Electronics housing and terminal block
644H GE polyphenylene oxide glass reinforced
Enclosure (options J5, J6)
Housing Low-copper aluminum
Paint Polyurethane
Cover O-ring Buna-N
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