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Rosemount 2100
Series
Vibrating Short Fork Technology
Vibrating fork technology uses the principal
of tuning fork vibration. When a tuning fork is struck, it
vibrates. This vibration occurs at what is known as the
forks ‘natural frequency’. This frequency will vary
depending on the relative size, shape, and material of the
forks.
In the Rosemount 2100 series the forks are driven to their
natural frequency of oscillation by a piezo-electric
crystal. Changes to this frequency are continuously
monitored. When the 2100 is used as a low alarm, the liquid
in the vessel drains down past the fork, resulting in a
change of natural frequency; this is detected by the
electronics which switch the output state. When used as a
high alarm, the liquid rises in the vessel, makes contact
with the fork and again the output switches.
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Piezo-Electric
Crystal |
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Exaggerated view of
Vibration |
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The natural frequency (~1300Hz) of the fork is chosen to
avoid interference from plant vibration which may cause
false switching. This also gives short fork length for
minimal intrusion into vessel and pipe. Using Short Fork
Technology, the Rosemount 2100 is designed for use in
virtually all liquid applications. Extensive research has
maximized the operational effectiveness of the fork design
making it suitable for almost all liquids, including coating
liquids (avoid bridging of forks), aerated liquids, and
slurries.
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Emerson Process Management,
Rosemount Division, 8200 Market Blvd.
Chanhassen, MN USA 55317
North America: 1-800-999-9307 International:
952-906-8888 Fax: 952-949-7001
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