Emerson 644 manual Example, Above, 22 20 815 C 1500 F Oven Temperature, 540 C 1000 F

Rosemount 644

Figure 1-1. 644 head mount Transmitter Connection Head Temperature Rise vs. Extension Length

Reference Manual

00809-0400-4728, Rev AA

June 2011

Above	60 (108)
	50 (90)
TemperatureRise, Ambient°C (°F)
	22 20 (36)
	40 (72)
		815 °C (1500 °F) Oven Temperature
	30 (54)
Housing			540 °C (1000 °F)
	10 (18)		Oven Temperature

250 °C (482 °F) Oven Temperature

0

3 4 5 6 7 8 9

3.6Extension Length (in.)

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

PRODUCT RECYCLING/DISPOSAL

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.

Recycling of equipment and packaging should be taken into consideration and disposed of in accordance with local and national legislation/regulations.

1-4