Resources Contact Us Home
Early warning heat sensor system

Image Number 2 for United States Patent #5384562.

A heat-sensitive alarm trigger is used to set off a fire alarm system having an alarm circuit with a rated trigger resistance. The alarm circuit is triggered when a resistance across two sensor leads, between which the alarm trigger is connected, falls below the rated trigger resistance. The heat-sensitive alarm trigger comprises a laminate structure which includes an optionally perforated first electrode layer and a second electrode layer. A barrier material layer which is disposed between the two electrode layers has a resistance above the rated trigger resistance. A layer of hydrated material is disposed on the perforated electrode layer. When the hydrated material is heated above a given alarm trigger temperature, moisture is given off through the holes in the first electrode and, as a result, the barrier layer becomes sufficiently conductive so as to lower a resistance across the electrodes to below the rated trigger resistance. In the alternative, the hydrated layer is the barrier layer sandwiched between the electrodes. When the barrier layer reaches a given trigger temperature, its resistance falls below the rated trigger resistance, and the alarm circuit is triggered.

  Recently Added Patents
Packet transmission system and fault recovery method
Backlight assembly, method for driving backlight assembly, and liquid crystal display having the same
Varying latency timers in a wireless communication system
Method of treating lung cancer
Piezoelectric device and fabricating method thereof
Antibody recognizing turn structure in amyloid .beta.
  Randomly Featured Patents
Deterioration diagnosis of diesel particulate filter
Betulinic acid and dihydrobetulinic acid derivatives and uses therefor
Stowable semi-rigid wing sail system
Mechanism to handle events in a machine with isolated execution
Female to female CATV splice connector
Apparatus for preparing and dispensing liquids for the treatment of photosensitive material
Methods for detection of a target nucleic acid by capture
Electronic assembly and heat sink
Fuse circuit and method therefor which minimizes fuse grow back effect
Harvester header with floating cutter bar