Rosemount Tank Radar Ab

Jingdong Zhang

Tadewos Tzegazeab

Jeffery Allan Sears

Kevin Thomas

Andrew David Mackrell

Marianne Williams

Timothy Hill

The invention provides a method of verifying the health of a liquid level detection device, preferably a vibrating fork level switch, while the device remains in situ. The method includes, independently of the device, verifying if the fork tines are fully wet or fully dry. This step can be carried out by a further, independent, level measuring apparatus.

In or relating to field devices

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

A point level switch for industrial interface detection is described, the switch including a microwave waveguide sensor in place of the more commonly encountered vibrating fork.

Relating to interface detection

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.

Growing community of inventors

Berkshire, United Kingdom

Jingdong Zhang