Patent ID: 9121399
Filing Date: 2015-09-01
Classification: F04B,F04D

Abstract:
1. A straining device for a drainage pump, the straining device comprising a body having a roof and defining an inner chamber; at least one straining element by which liquid may enter the chamber; and at least one outlet by which liquid may leave the chamber, wherein the straining device further includes a liquid level sensor arranged to detect the level of a liquid in which said straining device is located during use and, upon determining that said liquid level exceeds a threshold, to cause an activation signal to be sent to said pump, and wherein said liquid level sensor comprises non-contact sensing means, wherein said liquid level sensor is located substantially at said roof and generates a directed sensing field in use, said liquid level sensor being positioned so that, in use, said directed sensing field extends substantially upwardly from said roof and substantially none of said directed sensing field extends below said threshold.