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.

Piezo-Electric Crystal

Exaggerated view of Vibration

 

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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