Reference Manual
Rosemount 708
Section 5 Operation and Maintenance
SAFETY MESSAGES
Warnings
OPERATION
Safety Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page
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.
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
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.