Emerson Rosemount 644h, Reference Manual

Page: 27 / 78

Reference Manual
00809-0100-4728, Rev HA
December 2002
Models 644H and 644R
www.rosemount.com
Section 3 Configuration
Safety Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 3-1
Model 275 HART Communicator . . . . . . . . . . . . . . . . . . . . page 3-2
Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 3-2
Multidrop Communication . . . . . . . . . . . . . . . . . . . . . . . . . page 3-13
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 ( ). Please
refer to the following safety messages before performing an operation
preceded by this symbol.
Warnings
Failure to follow these installation guidelines could result in death or
serious injury.
• Make sure only qualified personnel perform the installation.
Explosions could result in death or serious injury.
• Do not remove the connection head cover in explosive atmospheres when the
circuit is live.
• Before connecting a Model 275 HART Communicator in an explosive atmosphere,
make sure the instruments in the loop are installed in accordance with instrinsically
safe or non-incendive 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.
Process leaks could result in death or serious injury.
• Do not remove the thermowell while in operation.
• Install and tighten thermowells and sensors before applying pressure
Electrical shock could cause death or serious injury.
• Use extreme caution when making contact with the leads and terminals.