Xtralis Technologies, Ltd.

Garrett Thermal Systems Limited

Vision Fire & Security Pty Ltd

Michael Rezny

Kemal Ajay

Arjun Vinoo Caprihan

A method of detecting one or more blocked sampling holes in a pipe of an aspirated smoke detector system. The method includes ascertaining the base flow of fluid through a particle detector using a flow sensor; monitoring subsequent flow through the particle detector; comparing the subsequent flow with the base flow; and indicating a fault if the difference between the base flow and the subsequent flow exceeds a predetermined threshold.

Sensing apparatus and method

A method for the determination of the time of flight of a signal transmitted between a transmitter () and a receiver (). In one form, the method involves transmitting a first signal and a second signal having a waveform modification introduced at a predetermined point in time of the duration of the second signal; receiving said first and second transmitted signals; determining a point of diversion between the first and second received signals to determine an arrival time of the introduced waveform feature modification at the receiver. In addition, the invention provides an accurate time of flight determination of ultrasonic signals in a flow sensor () adapted for a smoke detector system ().

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Mount Waverley, Australia

Michael Rezny