US 2002/0000914 A1Published application

Apparatus and method for monitoring line disconnection and a fire, and a fire alarm system having the same

AssigneeSamsung Electronics Co., Ltd.

InventorsMin-Sik Koo, Kang-Ok Kim

Life of this patent

Estimating the term…

Loading patent…

Abstract

A fire alarm apparatus, for checking line disconnection or occurrence of a fire, regardless of the installation place of a terminal endpoint resistor installed for checking disconnection of a line of fire detectors. When a signal representing a present voltage state of the detectors is input through the line, a control section compares the voltage level of the signal with a reference voltage level, and generates either a line disconnection control signal or a fire control signal. A first alarm section provides indication of disconnection of the line in response to the line disconnection control signal and a second alarm section provides indication of the occurrence of fire in response to the fire control signal. The apparatus can thus monitor a state of the detecting line, the common line and the fire detectors, regardless of the installation place of the terminal endpoint resistor.

Claims21

Dependent claims

An apparatus for monitoring line disconnection and occurrence of fire, comprising:

an operation verifier that outputs a first detecting voltage signal representing an operation state of a fire detector and that outputs a verification-confirming signal in response to a line disconnection-verifying signal;
a first detector that outputs first and second detecting signals respectively representing an operation state of the fire detector and a state of a first line of the fire detector, in response to the first detecting voltage signal and the verification-confirming signal;
a second detector that receives a second detecting voltage signal representing the operation state of the fire detector and outputs a third detecting signal representing a state of a second line of the fire detector;
and
a controller that receives the first, second and third detecting signals, compares a voltage level of the first detecting signal with a voltage level of a predetermined first reference value, provides the line disconnection-verifying signal to said operation verifier according to a comparison result, based on the second detecting signal generated in accordance with a result of providing the line disconnection-verifying signal generates either a first line disconnection control signal to provide indication of a first line disconnection of the fire detector or a fire control signal to provide indication of occurrence of fire, and based on a comparison of a voltage level of the third detecting signal with a voltage level of a predetermined second reference value generates a second line disconnection control signal to provide indication of a second line disconnection of the fire detector.

2 more elements

An apparatus for monitoring line disconnection and occurrence of fire, comprising:

a plurality of detectors that detect occurrence of fire to output a fire occurring signal;
a controller that receives through a line of said plurality of detectors a detecting voltage signal representing a present voltage state of said plurality of detectors, compares a voltage level of the detecting voltage signal with a predetermined reference voltage level, and based on a comparison result generates either a line disconnection control signal or a fire control signal respectively representing disconnection of the line of said plurality of detectors and the occurrence of fire;
a first alarm that provides indication of the disconnection of the line of said plurality of detectors in response to the line disconnection control signal;
and
a second alarm that provides indication of the occurrence of fire in response to the fire control signal.

2 more elements

A method for monitoring line disconnection and occurrence of fire in a fire alarm system, comprising:

comparing whether or not a voltage level of a first detecting signal representing a present voltage state of a fire detector is lower than a voltage level of a predetermined first reference value;
generating a first line disconnection-verifying signal having a voltage value of high level and a second line disconnection-verifying signal having a voltage value of low level when the voltage level of the first detecting signal is lower than the voltage level of the predetermined first reference value, and generating a line disconnection control signal representing line disconnection of the fire detector when a voltage level of a second detecting signal fed back through a line of the fire detector is respectively detected as a voltage level opposite to voltage levels of the first and the second line disconnection-verifying signals;
and
generating a fire control signal representing occurrence of fire regardless of the voltage levels of the first and second line disconnection-verifying signals, when the voltage level of the second detecting signal fed back through the line of the fire detector is detected as a uniform voltage level.

1 more element

Dependencies are inferred from the claim text.