Rosemount Tank Radar Ab

Rosemount Measurement Limited

Mobrey Limited

Tadewos Tzegazeab

Jeffery Allan Sears

Jingdong Zhang

Gregory Michael Leach

Rehan Azfar Ashraf

Kevin Thomas

Andrew David Mackrell

The invention provides a method and apparatus for checking the condition of a self-oscillating vibrating fork level switch. The switch includes a test facility that operates when the switch is taken from a closed loop feedback operating mode into an open loop test mode. Amplitudes of the received test signals are subjected to comparison with predetermined thresholds to establish the health of the switch.

Vibrating fork level switches

The invention provides a method for configuring for use a vibrating fork level switch having a dry fork frequency DFF. The method involves establishing a wet fork frequency WFF and combining this with the DFF to configure the switch for use in media of differing densities.

The invention describes a vibrating fork point level switch with multiple switching points.

Level switches

The invention provides a method of, and means for detection the condition of the fork of a vibrating fork level sensor. Changes in the normal operating frequency are compared with previous measurements and an alert generated if the change becomes significant. The method is preferably used to detect significant levels of coating build-up on the fork.

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Berkshire, United Kingdom

Tadewos Tzegazeab