Devices, systems, and methods for providing smoke detectors are described herein. One smoke detector of a fire sensing system includes a circuit board body, having a set of front scattering emitting light sources located on one side of an optical chamber, a receiver of front scattering light beams from the front scattering emitting light sources and backward scattering light beams, and a set of backward scattering emitting light sources located between the set of front scattering emitting light sources and the receiver, the backward scattering light beams emitted from the backward scattering emitters.

An apparatus to enable people who are handicapped, especially those who are wheelchair bound, to be able to install and replace objects that are affixed near the ceiling. The apparatus includes a lower level affixed at a location within reach of a seated person and including a vertical height adjustment pole movably retained by plate at the lower level. A top plate retains a device which is positioned adjacent a ceiling. The top plate is affixed adjacent a top end of the vertical height adjustment pole. The vertical height adjustment pole is lowered to be in reach of the seated person to enable the seated person to work on the device retained on the top plate. After work on the device is completed, the vertical height adjustment pole is retained so that the top plate is adjacent a ceiling.

The optical detector of a value of an atmospheric physical quantity representative of a danger includes: a measurement chamber accessible to the atmosphere; an electronics compartment for receiving electronics for detecting the value of the atmospheric physical quantity representative of a danger, the detecting electronics including electronic elements comprising at least: a light emitter, a light receiver that is sensitive to at least some of the wavelengths of the light rays emitted by the emitter, and electronics for processing detection signals,
the detector in addition including: a first light guide facing the emitter in order to direct the light emitted by the emitter from the electronics compartment to a detecting zone in the measurement chamber; and a second light guide facing the receiver in order to direct light originating from said detecting zone to the electronics compartment in order to be received by the receiver, the amount of light received by the receiver being representative of the presence/absence in the detecting zone of said physical-quantity value representative of a danger.

The electronics compartment is separated from the measurement chamber, and isolates all of the electronic elements that it contains from the atmosphere and the light guides are arranged to penetrate the electronics compartment in a way that is seal-tight to the atmosphere.

The optical detector of a value of an atmospheric physical quantity representative of a danger includes: a measurement chamber accessible to the atmosphere; an electronics compartment for receiving electronics for detecting the value of the atmospheric physical quantity representative of a danger, the detecting electronics including electronic elements comprising at least: a light emitter, a light receiver that is sensitive to at least some of the wavelengths of the light rays emitted by the emitter, and electronics for processing detection signals,
the detector in addition including: a first light guide facing the emitter in order to direct the light emitted by the emitter from the electronics compartment to a detecting zone in the measurement chamber; and a second light guide facing the receiver in order to direct light originating from said detecting zone to the electronics compartment in order to be received by the receiver, the amount of light received by the receiver being representative of the presence/absence in the detecting zone of said physical-quantity value representative of a danger.

The electronics compartment is separated from the measurement chamber, and isolates all of the electronic elements that it contains from the atmosphere and the light guides are arranged to penetrate the electronics compartment in a way that is seal-tight to the atmosphere.

A 0U, rack-mounted, power distribution, environment monitoring, and fire-protection apparatus including an environmental monitoring sensor system, including a fire detection and protection system located in a computer rack. The invention includes a system to localize damage to equipment, business interruption, and hazardous conditions to a computer rack.

A smoke and/or fire detector for the detection and distance measurement of smoke (36) in a monitored zone (2), having a light transmitter (4) for transmitting a transmitted light signal (8), having a light receiver (6) for generating a received light signal (10) from the transmitted light signal (8) remitted or reflected in the monitored zone (2), and having an evaluation unit (12) for evaluating the time of flight of the received light signal (10), wherein the evaluation unit (12) has a transient recorder (14) and wherein the transient recorder (4) is configured to record multiple received light signals (10) of a single transmitted light signal (8) successively following in time in a time period and the evaluation unit (12) is configured to evaluate the received slight signals (10).

This sensor system includes: a sensor that is provided with a sensor cover having an opening formed on one end and a sensor main body which is detachably disposed on an inner portion of the sensor cover; and a detachment tool used to detach the sensor main body from the sensor cover, wherein the sensor includes an attachment structure used to attach the sensor main body to the inner portion of the sensor cover, the detachment tool includes a detachment structure used to detach the sensor main body from the inner portion of the sensor cover, and in the detachment structure, by pushing the detachment tool into the sensor main body from the opening of the sensor cover, the sensor main body is detached from the inner portion of the sensor cover.

This sensor system includes: a sensor that is provided with a sensor cover having an opening formed on one end and a sensor main body which is detachably disposed on an inner portion of the sensor cover; and a detachment tool used to detach the sensor main body from the sensor cover, wherein the sensor includes an attachment structure used to attach the sensor main body to the inner portion of the sensor cover, the detachment tool includes a detachment structure used to detach the sensor main body from the inner portion of the sensor cover, and in the detachment structure, by pushing the detachment tool into the sensor main body from the opening of the sensor cover, the sensor main body is detached from the inner portion of the sensor cover.

In accordance with certain embodiments, detection of a fire event via detection of scattered light of at least two wavelengths is initiated only after a signal from a light detector and/or a sensor for detecting one or more fire signatures other than smoke exceeds a triggering threshold.

A smoke detector includes a tamper indicator that can prevent a cover from at least partially covering a battery location and/or mounting of a detector body to a detector mount if a battery is not located at the battery location of the detector body. The detector mount and/or cover can engage with the detector body by relative rotation about an engagement axis, and the tamper indicator can pivot about a pivot axis that is parallel to the engagement axis and/or move along a linear path. The tamper indicator can prevent engagement of a portion of the detector mount, such as an intermediate component between the detector body and a base of the detector mount, with the detector body. The intermediate component can at least partially cover the battery location when engaged with the detector body. The base of the detector mount can engage with the detector body via the intermediate component.