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Reference Manual
00809-0100-4708, Rev AD
September 2012
5-1
Rosemount 708
Section 5 Operation and Maintenance
Safety Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 5-1
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 5-1
Alerts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 5-2
Power Module Replacement . . . . . . . . . . . . . . . . . . . . . . . page 5-5
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
OPERATION The Rosemount 708 senses acoustic energy and temperature of the
waveguide. The acoustic energy is reported in 'counts,' which are a relative
indication of the magnitude of the acoustic energy sensed. The acoustic
sensor used in the Rosemount 708 is sensitive to a broad range of spectral
frequencies in order to work in many different installations. The acoustic
measurement or “count” in the Rosemount 708 is an average of the broad
range of frequencies. No additional signal processing is performed to isolate
specific frequencies.
This count information is used to determine the state of a steam trap,
pressure relief valve, or other mechanical system. The device works similar
to a discrete device, looking for a large change in noise level that is made
during a leak or release. In the case of steam traps, SteamLogic software
calculates the steam trap state based on the acoustic and temperature
information published by the Rosemount 708. (Refer to SteamLogic manual
for further information.)
In the case of other equipment, the Rosemount 708 may be configured with
alerts to detect and communicate changes in the state of the system being
monitored.
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.
Installation of this transmitter in an explosive environment must be in accordance with the
appropriate local, national, and international standards, codes, and practices. Please review
the Product Certifications section for any restrictions associated with a safe installation.
• Before connecting a Field Communicator in an explosive atmosphere, ensure the
instruments are installed in accordance with intrinsically safe