Abstract: A method of determining energy content using a specific gravity meter double calibrated to measure both molecular weight and relative density.

Abstract: The invention provides a method of calibrating a vibrating tube densitometer intended to operate at combined elevated temperatures and pressures.

Abstract: 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.

Abstract: The invention provides a method for improving the accuracy of level measurement by reducing or eliminating receive circuit saturation in ultrasound level measurement apparatus. The method involves adjusting the transmit power in order to control echo amplitude, in particular to avoid saturation, when the surface being monitored is within a pre-defined distance from the ultrasound transducer. The particular advantage of the invention is that it may be implemented without change to the electronic circuitry embodied in the apparatus.

Abstract: The invention describes a vibrating element apparatus, preferably in the form of a tuning fork-type contact level transducer, and a method of forming the same. The tines of the transducer are vibrated by piezoelectric elements, which piezoelectric elements are arranged in a stack along with insulators and conductors to allow cyclic electrical signals to be applied thereto. The stack is provided as a sub-assembly allowing ready replacement in the field and 10 without disturbing the installation of the transducer in the plant which it serves.

Abstract: A method of determining energy content using a specific gravity meter double calibrated to measure both molecular weight and relative density.

Abstract: The invention describes a vibrating tine level detection device, and a method of forming the same, which is particularly suitable for operation in environments subject to rapid temperature change. A piezoelectric stack, which generates vibration of the tine, is located within a cage. The cage is, in turn, located within a hollow body defined by a diaphragm, from which the tines extend, and a wall section. The cage is attached to the inside surface of the wall section, adjacent to the junction between the wall section and the diaphragm. As a consequence, the ability of the cage to maintain a substantially constant compression on the piezoelectric stack is substantially unaffected by thermal expansion or contraction of the wall section.

Abstract: The invention provides a method of calibrating a vibrating tube densitometer intended to operate at combined elevated temperatures and pressures.

Abstract: The invention provides a method for improving the accuracy of level measurement by reducing or eliminating receive circuit saturation in ultrasound level measurement apparatus. The method involves adjusting the transmit power in order to control echo amplitude, in particular to avoid saturation, when the surface being monitored is within a pre-defined distance from the ultrasound transducer. The particular advantage of the invention is that it may be implemented without change to the electronic circuitry embodied in the apparatus.