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AssigneePulsar Process Measurement Limited
InventorsStephen BALL, Andrew FOO, Georgina PERKINS
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An apparatus for measuring at least one of the level and the velocity of a media in a channel, the apparatus including a remote measuring device which comprises: a sensing unit having at least one sensing assembly arranged to measure at least one of the level and the velocity of the media, a two-wire interface arranged to receive power from an external power source and permit data transfer between the sensing assembly and an external control unit over the two-wire interface, an energy store for storing energy transmitted to the measurement device over the two-wire interface, a controller, and characterized in that the remote measuring device further comprises: an indicator means for providing in-situ feedback to a user on the status of the measuring device, and a switching means which is operable in response to signals from the controller to selectively connect each of the sensing unit and the indicator means to the energy store.
Apparatus for measuring at least one of the level and the velocity of a media in a channel, the apparatus including a remote measuring device which comprises:
A method of operation of the apparatus of claim 19, in which the controller monitors and replenishes the energy store from the two-wire interface by operating the first switch and second switch to disable power to the sensor unit and the indicator, the method further comprising disabling power to the controller and transferring control to a timed trigger circuitry to maximize power saving, by operating the third switch under control of the controller, wherein power is returned to the controller, wherein power is returned to the controller after the timed trigger circuit has determined an elapsed time.
The method of claim 20, wherein the external control unit sets the loop current to maximum during operation in the installation mode and disables signaling on the loop.
The method of claim 20, wherein, during operation in a measurement mode, the external control unit sets the loop current to be proportional to the measurement value, whilst the indicator provides updates on device status and application condition.
Dependencies are inferred from the claim text.