Resources Contact Us Home
Smoke detector with individual sensitivity calibration and monitoring

Image Number 4 for United States Patent #5543777.

A process and apparatus are provided for calibrating an individual smoke detector prior to installation so its sensitivity can be determined easily throughout its useful life. Representations of detector output signals are stored in the detector prior to installation, preferably at the time of manufacture, and used later for determining the sensitivity of the detector. The signals may represent alarm and clean-ambient conditions, or one of such conditions and the difference between them. During monitoring of the detector, after its installation, a new reading of a corresponding signal under clean-ambient conditions is sampled and the differences before and after installation are compared to determine the sensitivity of the detector when it is monitored. The detector includes electrical contacts from which a representation of detector sensitivity is available for monitoring with an external electrical probe, such as a common voltmeter.

  Recently Added Patents
Methods circuits apparatuses and systems for facilitating access to online content
Critical word forwarding with adaptive prediction
Method of patterning color conversion layer and method of manufacturing organic EL display using the patterning method
Cell reselection and handover with multimedia broadcast/multicast service
Polyolefin and composition for pipe systems and sheets
Shoe outsole with a surface ornamentation contrast
Solid-state imaging apparatus and imaging system
  Randomly Featured Patents
Insulator for an open coil electric heating unit
Maternity music belt
Apparatus and method for performing microfluidic manipulations for chemical analysis and synthesis
Phase shift mask with two-phase clear feature
Two piece laundry additive dispenser cup
Ink jet printhead assembly having aligned dual internal channel arrays
Method of and device for analyzing performances in athletic events
Resolvins: Biotemplates for novel therapeutic interventions
Scaffolded fusion polypeptides and compositions and methods for making the same