Abstract: A fire extinguisher monitoring system is described, said fire extinguisher monitoring system comprising a magnetic member for attachment to a fire extinguisher, a magnet, and a magnetic field sensor, wherein said magnetic field sensor is located proximal to said magnet to detect the presence of said magnetic member in said magnet's magnetic field. A method of monitoring the location of a fire extinguisher is also described.

Abstract: An apparatus for fluid level measurement comprises an upright tube (10) extending into a storage tank (12) substantially the full height distance of the tank (12). An acoustic transducer (14) is positioned at the top of the tube (10) and adapted to emit a sound pulse to be bounced off the surface (16) of the fluid level within the tube (10) and to receive a reflected pulse. Means is provided for measurement of the time of arrival of the reflected sound pulse. An acoustic coupling means is provided for the transducer (14) to shape and increase the amplitude of the pulse emitted from the transducer (14) together with an increase in the amplitude of the voltage produced by the transducer (14) in response to the received reflected pulse.

Abstract: An apparatus for fluid level measurement comprises an upright tube (10) extending into a storage tank (12) substantially the full height distance of the tank (12). An acoustic transducer (14) is positioned at the top of the tube (10) and adapted to emit a sound pulse to be bounced off the surface (16) of the fluid level within the tube (10) and to receive a reflected pulse. Means is provided for measurement of the time of arrival of the reflected sound pulse. An acoustic coupling means is provided for the transducer (14) to shape and increase the amplitude of the pulse emitted from the transducer (14) together with an increase in the amplitude of the voltage produced by the transducer (14) in response to the received reflected pulse.