Abstract: A disaster prevention monitoring and control facility for polling a plurality of terminal units from a receiver to read terminal information from the plurality of terminal units, judging the terminal information as required, displaying the judged result, or controlling the plurality of terminal units, which frame checks data transmitted from the receiver to the terminal units or data transmitted from the terminal units to the receiver.

Abstract: An ionization-type smoke detector having inner and outer ionization chambers, a radioactive source to ionize the air within the inner and outer ionization chambers and a printed board to mount electrical circuits for detecting electrical potential at the connecting portion between both chambers is made to be relatively thin by arranging the inner, intermediate and outer electrodes so that they are respectively vertically mounted to the printed board while being transversally spaced apart from each other.

Abstract: A light-scattering-type smoke detector having a projecting element and a light receiving element surrounded by a labyrinth is disclosed wherein the labyrinth comprises an array of a plurality of light shielding columns arranged in a circle each having a substantially J-shaped cross section, and the head portion of each column is inclined relative to the bisector of an angle formed between the lines connecting a first reflecting point with the projecting and light receiving elements, the light shielding columns having darkly colored light reflective surfaces.

Abstract: A photoelectric smoke detector is equipped with a light emitter for radiating light into a measuring space. A light receiver detects scattered light caused by the presence of smoke in the measuring space. The measuring chamber is constructed as a light trap such that the light beam radiated by the light emitter is multiply reflected and cannot reach the light receiving element of the light receiver.

Abstract: A fire detector is equipped with a sensor which detects physical quantities such as heat, light or smoke and which, in particular, stores the time when the fire detector responds or generates an alarm and also stores the output level of the sensor at such time and displays these stored data whenever required. It also stores successive output levels of the sensor at each of a series of predetermined time intervals along with the respective time values until the fire detector generates an alarm and displays these stored data whenever required.

Abstract: A fire detector having a body comprising a cover part and a hood part and containing therein fire detecting means and electrical circuits, and a base detachably fastening the body by engaging means provided on them, respectively, is disclosed wherein in order to prevent the cover part from coming off the hood part due to shock, vibration, etc. possibly subjected thereto at the time of maintenance, inspection, etc.

Abstract: Fire detection apparatus includes a fire detector panel and an accumulation-type control panel in which the fire detection element is non-latching but the fire voltage detection circuit includes a fire indicator which is latched when a fire signal is detected for longer than a predetermined time. The circuit for latching is controlled by an accumulation circuit in the control panel that controls a relay closing that generates a fixed voltage suitable for the fire indicator.

Abstract: An alarm and control system for semiconductor factories or the like includes, at locations where poisonous and inflammable gases such as silane gas are used as in the manufacturing process of semiconductors, gas detectors to detect the leakage of the treatment gases and fire detectors to detect products of combustion of the treatment gases, and these detectors are adapted to cause, upon any changes in the output state of either of them, an alarm to issue and a protection device such as a fire distinguishing device as well as the manufacturing process to be controlled.

Abstract: A foam extinguishing system in which a foam generating net is provided at the front of a chamber, and foam nozzles and a gas discharge nozzle are provided at the rear of the chamber is disclosed wherein in order to lengthen the flying distance and suspension time of the non-combustible gas solution discharged from the gas discharge nozzle a deflector is provided in front of the nozzle to reflect and disperse a non-combustible gas solution discharged from the nozzle rearwards or sideways from the rear. The gas discharge nozzle provided with the deflector may be also located in such a position that the non-flammable gas solution reflected and dispersed by the deflector does not disturb the discharge pattern of a foam solution from the foam nozzles and that the non-combustible gas is pushed forward by an air flow generated in the air by a negative pressure.

Abstract: An alarm and control system for semiconductor factories or the like wherein poisonous and inflammable treatment gases such as silane gas are used as in the manufacturing process of semiconductors, etc. is disclosed. Gas detecting means are provided at locations where the treatment gases are used, the gas detecting means utilizing metal oxide semiconductors containing platinum black as a detecting element for detecting the leakage of the treatment gases.

Abstract: A photoelectric smoke detector is provided with first and second radiation emitters and first and second radiation receivers. The first emitter emits pulsed radiation at a predetermined frequency. The second emitter emits pulsed radiation at twice this frequency. The first receiver receives the radiation of the second emitter directly and that of the first emitter by scattering only. When the first receiver receives alternate detection pulses reinforced by scattered radiation, an alarm is generated. The second receiver receives radiation directly from the first emitter and modulates the radiation output level of the second emitter proportionately. When the first receiver receives testing pulses between the alternating detection pulses, their level is discriminated to determine the functional state of the detecting elements and a corresponding function signal is generated.

Abstract: An alarm system for serving notice of abnormalities such as fire, burglary or other malfunctions has extinction-type separated smoke detectors which detect smoke by exploiting the phenomenon that the intensity of a light beam emitted by a light transmitter toward a light receiver remote from the light transmitter undergoes attenuation due to the occurrence of smoke. The alarm system utilizes the light beam as a carrier for transmitting a signal indicative of an abnormality, thereby reducing the number of line conductors required for signal transmission in this kind of alarm system while signal transmission is rendered less susceptible to the influence of electromagnetic interference. The light transmitter is provided with a signal input circuit composed of an encoder and a serial-to-parallel conversion circuit for receiving the signal to be transmitted and a modulating circuit for modulating a current for driving the light transmitter with the output signal of the signal input circuit.

Abstract: An ionization type smoke detector for fire alarm comprises an inner ionization chamber (a) defined by an inner electrode (6) and an intermediate electrode (8), an outer ionization chamber (b) defined by the intermediate electrode (8) and an outer electrode (11), and a single radioactive source (3) for ionizing air present in both ionization chambers (a; b). In this type of an ionization type smoke detector, for the purpose of protecting the radioactive source from contamination on one hand and assuring on the other hand that smoke positively supplied to the smoke detector for operational testing is promptly dispelled from the detector upon completion of the test so that the detector can be rapidly restored to the normal operating state, the radioactive source (3) is enclosed by the inner electrode (6), a substrate (1) and an annular wall (2), while the intermediate electrode (8) is supported by a plurality of studs (9) extending from the substrate (1).

Abstract: A sensor for detecting low concentrations of silane gas in air and a process for making the sensor are disclosed. The sensor comprises a silane-sensitive element and a heater to heat the element to 200.degree.-400.degree. C. The element comprises an electrode-equipped alumina porcelain tube coated with a mixture of SnO.sub.2, SbOCl, and Pt. The tube is calcined in air or in an oxidized antimony atmosphere at 600.degree.-850.degree. C. and is exposed to a silane atmosphere at 150.degree.-850.degree. C. to stabilize its properties.

Abstract: An element for selectively sensing carbon monoxide which is capable of sensing a lower concentration of CO in a quicker response time at ordinary temperatures without the need of heating the element with better SN and low temperature dependence.

Abstract: A light extinction type smoke detector which uses simple pulsed light or modulation pulsed light to reduce energy consumption, and precisely discriminates smoke generated by fire from extraneous interruption of the light beam from the light source to the photoelectric element to prevent a false alarm.

Abstract: A fire detector comprises a piezo-electric element attached to a vibrating portion which is part of a component constituting the detector. The component having the vibrating function may be a casing or an electrode or any other suitable member. The piezo-electric buzzer is thus incorporated in the detector to form a simple and compact fire detector with an alarm device.

Abstract: Method of detecting carbon monoxide gas at temperatures of 100.degree. C. or less by using a detecting element containing stannic oxide as the main component, which element is prepared by mixing stannic oxide, antimony trioxide and platinum in atomic ratios of Sb/Sn = at least 0.005, Pt/Sn = at least 0.004 and Sb/Pt = at least 0.005, and sintering said mixture at a temperature of at least 625.degree. C.

Abstract: For the purpose of making its overall dimension small an automatic sprinkler of the flush type generally comprising a sprinkler body having a discharge orifice, a plug body to sealingly close the discharge orifice, levers associated with a soldered link to force the plug body to close the discharging orifice when assembled and a deflector to uniformly distribute water flowing under pressure through the discharge orifice when the plug body operates, the deflector being arranged outside and directly below the sprinkler body, the deflector being slidably connected to the sprinkler body by way of guide bars.