Reference Manual
00809-0100-4697, Rev EA
October 2011 Rosemount 848T
www.rosemount.com
Section 4 Operation and Maintenance
Safety Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 4-1
Foundation fieldbus Information . . . . . . . . . . . . . . . . . . . .page 4-1
Hardware Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 4-3
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 4-4
SAFETY MESSAGES Instructions and procedures in this section may require special precautions to
ensure the safety of the pe rsonnel performing the op erations. Information that
potentially raises safety issues is indicated by a warning symbol ( ). Please
refer to the following safety messages before performing an oper ation
preceded by this symbol.
Warnings
FOUNDATION FIELDBUS
INFORMATION FOUNDATION fieldbus is an all-digital, serial, two-way, multidrop
communication protocol that interconnects devices such as transmitters and
valve controllers. It is a local area network (LAN) for instruments that enable
basic control and I/O to be moved to the field devices. The Model 848T uses
FOUNDATION fieldbus technology developed and supported by Emerson
Process Management and the other members of the independent Fieldbus
FOUNDATION.
Failure to follow these installation guidelines could result in death or
serious injury.
• Make sure only qualified personnel perform the installation.
Process leaks could result in death or serious injury.
• Do not remove the thermowell while in operation. Removing while in operation may
cause process fluid leaks.
• Install and tighten thermowells and sensors before applying pressure, or process
leakage may result.
Electrical shock could cause death or serious injury.
• If the senor is installed in a high voltage environment and a fault condition or
installation error occurs, high voltage may be present on transmitter leads and
terminals.
• Use extreme caution when making contact with the leads and terminals.