Patent ID: 8001829
Filing Date: 2011-08-23
Classification: G01N,Y02E

Abstract:
1. Apparatus for sensing at least one parameter in a liquid, which apparatus comprises sensor means for sensing the parameter in the liquid, rotation means, drive and generator means for driving the rotation means and generating electricity, electricity storage means, and control means, the apparatus being such that in use the rotation means operates in a flow of the liquid, the drive and generator means drives the rotation means when the flow of liquid is below a predetermined value whereby the rotation means maintains the flow of liquid at or above the predetermined value, the drive and generator means is driven by electricity from the electricity storage means, the flow of liquid drives the rotation means when the flow of liquid is at or above the predetermined value, the drive and generator means is operated by the rotation means when the rotation means is driven by the flow of liquid, electricity generated by the drive and generator means is stored in the electricity storage means for use in driving the drive and generator means, and the control means controls the operation of the apparatus consequent upon the rate of flow of the liquid.