Smoke detector sensitivity testing apparatus
AssigneeNo Cilmb Products Limited
InventorsStephen Ellwood, David Appleby
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Abstract
Apparatus for testing the sensitivity of a smoke detector (12) in-situ, including a head assembly (1) comprising a housing (14) for surrounding a smoke detector in-situ and forming part of a sensing loop (14, 15, 16, 17)through which air carrying an aerosol will circulate, a sensor (25, 26, 27) for sensing the concentration of aerosol in the air circulating in the loop, a fan (20) for causing air to circulate in the loop, an aerosol container (24) for supplying aerosol to the loop and a control unit 2 for controlling the concentration of aerosol in the air circulating in the loop by controlling the fan (20) and the aerosol container (24) in response to the output of the sensor.
Claims14
Apparatus for testing the sensitivity of a smoke detector in-situ, comprising
- a head assembly comprising,
- a housing for surrounding a smoke detector in-situ and forming part of,
- means defining a circulating loop through which air carrying an aerosol will, in operation, circulate, said means including a defined delivery flow path and a defined return flow path,
- sensor means for directly sensing the concentration of aerosol in the air circulating in the loop,
- air circulating means for causing air to circulate in the loop,
- aerosol supply means for supplying aerosol to the loop and
- control means for controlling the concentration of aerosol in the air circulating in the loop by controlling the air circulating means and the aerosol supply means in dependence on the output of the sensing means.
Dependencies are inferred from the claim text.