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Reference Manual
00809-0400-4728, Rev AA
June 2011
Rosemount 644
1-4
Figure 1-1. 644 head mount
Transmitter Connection Head
Temperature Rise vs. Extension
Length
Example
The transmitter specification limit is 85 °C. If the ambient temperature is 55 °C
and the process temperature to be measured is 800 °C, the maximum
permissible connection head temperature rise is the transmitter specification
limit minus the ambient temperature (moves 85 to 55 °C), or 30 °C.
In this case, an extension of 100 mm meets this requirement, but 125 mm
provides a margin of 8 °C, thereby reducing any temperature effects in the
transmitter.
RETURN OF MATERIALS To expedite the return process in North America, call the Emerson Process
Management National Response Center toll-free at 800-654-7768. This
center, available 24 hours a day, will assist you with any needed information
or materials.
The center will ask for the following information:
• Product model
• Serial numbers
• The last process material to which the product was exposed
The center will provide
• A Return Material Authorization (RMA) number
• Instructions and procedures that are necessary to return goods that
were exposed to hazardous substances
For other locations, please contact a Emerson Process Management sales
representative.
NOTE
If a hazardous substance is identified, a Material Safety Data Sheet (MSDS),
required by law to be available to people exposed to specific hazardous
substances, must be included with the returned materials.
PRODUCT
RECYCLING/DISPOSAL
Recycling of equipment and packaging should be taken into consideration
and disposed of in accordance with local and national legislation/regulations.
Housing Temperature Rise, Above
Ambient °C (°F)
3 4 5 6 7 8 9
0
60 (108)
50 (90)
40 (72)
30 (54)
20 (36)
10 (18)
3.6
22
Extension Length (in.)
815 °C (1500 °F) Oven Temperature
540 °C (1000 °F)
Oven Temperature
250 °C (482 °F) Oven Temperature