Table of Contents
Reference Manual
00809-0100-4728, Rev MB
Rosemount
Transmitter
Rosemount 644 Hardware Revision 30
Device Revision
HART
Read this manual before working with the product. For personal and system safety, and for optimum
product performance, make sure to thoroughly understand the contents before installing, using, or
maintaining this product.
The United States has two toll-free assistance numbers and one international number.
Customer Central
1-800-999-9307 (7:00 a.m. to 7:00 p.m. CST)
National Response Center
1-800-654-7768 (24 hours a day)
Equipment service needs
International
1-(952)-906-8888
1.1
Safety messages
Instructions and procedures in this section may require special precautions to ensure the safety of the
personnel performing the operations. Information that potentially raises safety issues is indicated by a
warning symbol ( ). Refer to the following safety messages before performing an operation preceded
by this symbol.
Failure to follow these installation guidelines could result in death or serious injury.
Explosions could result in death or serious injury.
Install and tighten thermowells and sensors before applying pressureInstallation of this transmitter
in an explosive environment must be in accordance with the appropriate local, national, and
international standards, codes, and practices. Review the approvals section of the Rosemount 644
Reference Manual for any restrictions associated with a safe installation.
In an Explosion-Proof/Flameproof installation, do not remove the transmitter covers when power
is applied to the unit.Process leaks could result in death or serious injury.
Electrical shock could cause death or serious injury.
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Make sure only qualified personnel perform the installation.
Do not remove the connection head cover in explosive atmospheres when the circuit is live.
Before connecting HART
installed in accordance with intrinsically safe or non-intrinsic field wiring practices.
Verify that the operating atmosphere of the transmitter is consistent with the appropriate
hazardous locations certifications.
All connection head covers must be fully engaged to meet explosion-proof requirements.
Do not remove the thermowell while in operation.
Use extreme caution when making contact with the leads and terminals.
644 Temperature
1
7
8
5
5
®
in an explosive atmosphere, make sure the instruments in the loop are
1
9
7
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