Testing of aspirating systems

1. An aspirating system for detecting the presence of a product representative of a hazard, the system comprising:

piping that includes a plurality of apertures spaced apart along the length of the piping;

an aspirator for drawing air from outside the piping into the piping through at least one aperture,

a detector coupled to the piping for detecting the presence of a product representative of a hazard;

at least one test stimulus generator of test stimulus for generating the product representative of a hazard;

a control unit for controlling the activation of the test stimulus from the at least one test stimulus generator; and

a timing device for measuring the time taken for the test stimulus to reach the detector following activation by said control unit,

wherein the at least one test stimulus generator is fixed in, near, or on the piping such that in use the test stimulus is provided adjacent to at least one aperture of the piping.

2. The system of claim 1 wherein the system further comprises storage means for storing data indicative of the time taken by the timing device.

3. The system of claim 2 further comprising a computing device for comparing the data from the storage means with predetermined data in order to determine comparison data of the time taken for the test stimulus to reach the detector.

4. The system of claim 3 wherein said computing device uses the comparison data to adjust or clean the aspirating system automatically.

5. The system of claim 1 wherein said control unit further comprises a real time clock to control activation of the at least one test stimulus generator on a scheduled basis.

6. The system of claim 1 , further comprising a plurality of sections of piping joined to form a pipe run and one or more generators, wherein each said generator is located at one end of each and/or any pipe run.

7. The system of claim 6 wherein the detector is located at the other end of the pipe run.

8. The system of claim 6 or 7 wherein there are a plurality of pipe runs that form a piping network and the detector is at the other end of each pipe run to form a hub of the piping network.

9. The system of claim 1 wherein the test stimulus generator comprises a battery for providing power to the test stimulus generator.

10. The system of claim 1 further comprising a power source to provide power to the aspirator and the detector, wherein the power to the test stimulus generator is provided by the same power source that provides power to the aspirator and the detector.

11. The system of claim 10 wherein the power source is mains AC power.

12. Method of detecting the presence of a product representative of a hazard in an aspirating system comprising:

providing piping that includes a plurality of apertures spaced apart along the length of the piping and a detector coupled to the piping and a detector coupled to the piping;

fixing a test stimulus generator in, near or on the piping; and

controlling the activation of the test stimulus from the test stimulus generator including:

providing test stimulus representative of a hazard adjacent to at least one aperture of the piping;

drawing in air from outside the piping into piping through at least one aperture;

detecting the presence of the product representative of a hazard; and

measuring the time taken for the test stimulus to reach the detector following activation of the test stimulus.

13. An aspirating system for detecting the presence of a product representative of a hazard, the system comprising:

piping that includes a plurality of apertures spaced apart along the length of the piping;

an aspirator for drawing air from outside the piping into the piping through at least one aperture;

a detector coupled to the piping for detecting the presence of a product representative of a hazard;

a generator of test stimulus for generating the product representative of a hazard, wherein the test stimulus generator is fixed in, near, or on the piping such that in use a test stimulus is provided adjacent to at least one aperture of the piping; and

a power source to provide power to the aspirator and the detector, wherein the power to the test stimulus generator is provided by the same power source that provides power to the aspirator and the detector.