A communication device and method for detecting an infinite return loss condition and temporarily halting or bypassing operations of an echo canceller in response to detecting that condition. The invention also relates to methods of using these lipolytic enzymes in industrial processes, for example in the dairy or baking industry. A screw is threadedly received in each band and adapted to force the contact into electrical engagement with the wire held within the opening of the band. The channels facilitate cooling by directing fluid about the windings of the coil as fluid is introduced into the electromagnet. A three dimensional conduit which is optionally used with a cyclonic separator is provided.