Hazard detection
First Claim
1. A detector including detector means for detecting a predetermined characteristic of ambient fluid and for producing a measurement signal indicative of the value of that characteristic of the fluid exceeding an initial threshold value, device detection means for receiving a signal indicative of the operational status of a device known to be associated with the varying of said characteristic and for altering the threshold value in dependence upon that detection, and means for producing a warning signal when the threshold is exceeded.
1 Assignment
0 Petitions
Accused Products
Abstract
In order to allow a smoke detector unit to be utilised in, for example, a domestic kitchen environment, appliances whose operation is commonly associated with the generation of non-hazardous smoke or aerosols are connected to a conventional mains supply socket via a current monitoring unit. The current monitoring units include a radio transceiver, which transmits the operational status of the appliances to a corresponding transceiver of the smoke detector unit 1. If the signals transmitted by the current monitoring units indicate that the appliances and are off, the smoke detector unit generates a warning signal when the smoke density exceeds a lower threshold. If one of the appliances and is detected to be on, the smoke detector unit generates a warning signal only when a second, higher threshold of smoke density is exceeded. Optionally, when the higher smoke density threshold is exceeded; the smoke detector unit transmits the signal to the current monitoring unit to power off the appliances. The invention is also applicable to the detection of other characteristics of ambient fluid, such as temperature or the presence of a particular gas or vapour.
26 Citations
39 Claims
- 1. A detector including detector means for detecting a predetermined characteristic of ambient fluid and for producing a measurement signal indicative of the value of that characteristic of the fluid exceeding an initial threshold value, device detection means for receiving a signal indicative of the operational status of a device known to be associated with the varying of said characteristic and for altering the threshold value in dependence upon that detection, and means for producing a warning signal when the threshold is exceeded.
- 15. A detector system including detection means for detecting a predetermined characteristic of ambient fluid and for producing a measurement signal indicative of the value of said characteristic of the fluid exceeding an initial threshold value, monitoring means for producing a monitoring signal indicative of the operation of a device the operation of which device is associated with the varying of said characteristic, and means for receiving the monitoring signal and for altering the threshold value in dependence upon the signal, and means for producing a warning signal when said threshold value is exceeded.
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32. A method of fire protection including providing detection means for detecting a predetermined characteristic of ambient fluid and for producing a measurement signal indicative of the value of the characteristic;
- providing one or more known devices, the operation of which is associated with varying said characteristic, with monitoring means for providing a signal to the detection means indicative of the operational status of the device with which the monitoring means is associated;
monitoring the measurement signal to determine whether it exceeds an initial threshold value;
in response to the exceeding of said threshold value, obtaining and analysing the signal from the or each monitoring device, and producing a warning signal if said analysis indicates that the device is inoperative, and otherwise increasing the threshold value temporarily and producing a warning signal if the increased threshold value is exceeded. - View Dependent Claims (33, 34, 35, 36, 37, 38, 39)
- providing one or more known devices, the operation of which is associated with varying said characteristic, with monitoring means for providing a signal to the detection means indicative of the operational status of the device with which the monitoring means is associated;
Specification