Emerson Rosemount 644 FOUNDATION, Reference Manual

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Reference Manual
00809-0400-4728, Rev CA
Introduction
September 2018
Introduction
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.
1.3 Return of materials
To expedite the return process in North America, call the Emerson 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.
1.4 Product recycling/disposal
Recycling of equipment and packaging should be taken into consideration and disposed of in
accordance with local and national legislation/regulations.