Abstract: A fire alarm system employing multiple sensors can accurately and quickly respond to real fires with an alarm signal and prevent issuance of a false alarm due to noise or the like. A pair of decision circuits in a fire signal receiver receive fire detection signals from respective sensors and produce fire occurrence signals representing a first level of probability that a fire has occurred and decision signals representing a second lower level of probability that a fire has occurred. A fire alarm is issued when a fire occurrence signal has been outputted by any one of the decision circuits or when a decision signal is simultaneously outputted by both decision circuits.

Abstract: A recorder comprises a recorder body including a case, holding means for holding continuous record paper sources such as, an elongated record form stack, and a record paper roll, guide structure for guiding a record paper taken out of the record paper source, and a record head for recording on said record paper fed through the guide structure, and a cover member for converting at least a portion of the holding means, the guide structure and the record head, the cover member being removably attached to the case. A non-continuous paper sheet, which is fed to the record head through a slot in the cover member along a feed path different from the continuous record paper, may be used in the recorder. A detector is also provided for detecting the end of the continuous record paper.

Abstract: An improved apparatus for detecting environmental disturbances such as the occurrence of a fire, a gas leak or the like, includes a central processing unit and a plurality of terminal detectors, wherein an identification code is assigned to each of the detectors and the central processing unit sequentially calls the detectors in rotation requesting them to transmit thereto the data collected on smoke concentration, gas concentration, temperature or the like. The apparatus is provided with a display unit and a memory. Data collected by each detector concerning on the environmental condition of the place where each detector is installed are stored in the memory in time series. When a signal for data exceeding a fixed reference level is received, a provisional alarm is raised for the operator and the stored data for a limited period of time in the past are displayed.

Abstract: In a polling type surveillance control apparatus for a security system, inherent addresses are assigned to respective terminal devices such as smoke detectors, temperature sensors, gas leakage detectors, fire partitions and smoke dampers. When a self address detector in the terminal device detects a coincidence between the address signal from a central station and a preset self address, the terminal device indicates it has been accessed or energized and power control thereof may also be performed.

Abstract: An environmental abnormality detecting apparatus for detecting abnormality in atmosphere such as heat, smoke, and a gas. A sampling circuit is provided for periodically sampling analog signals from a detector for detecting these phenomena. A quantizer quantizes sampled signals with step levels. An accumulator having a plurality of counters provides different accumulation times corresponding to the step levels. Reliability in accumulation effect is not degraded, and an abnormality signal can be detected in a short period of time when a degree of abnormality is high.

Abstract: A photoelectric smoke sensor terminal has an address signal detector for detecting whether or not an address assigned to the terminal coincides with an address represented by an address signal from a main unit. Only when the coincidence signal is supplied to a switch circuit is a photoelectric smoke sensor turned on. The terminal also has an item data memory for supplying item data (e.g. gas leakage and smoke generation data) so that a plurality of item data signals together with an output signal from the sensor can be transmitted on a single transmission line.

Abstract: An atmospheric abnormality detection system includes a command discriminator and a display/alarm circuit in each sensor terminal. When the command discriminator receives a coincidence signal from an address comparator, the command discriminator causes an A/D converter to convert an analog sensor output to a digital signal as response data. When an abnormal state display command is transmitted from a main unit to the command discriminator, the command discriminator causes the display/alarm circuit to display information indicating the abnormal state and/or generate an audible alarm.

Abstract: An alarm terminal device has a lower limit voltage generator for generating as a lower limit voltage an analog signal which is produced from a temperature sensor and which is lower than a first predetermined value, and an upper limit voltage generator for generating as an upper limit voltage an analog signal which is produced from the temperature sensor and which is higher than a second predetermined value. At least one additional sensor is provided for generating an analog data signal having a voltage higher than the upper limit voltage or lower than the lower limit voltage so as to indicate any information other than that contained in the analog signal from the temperature sensor. A disconnection or a short circuit of a platinum resistor of the temperature sensor can thus be represented by the analog data signal to be quantized by an analog-to-digital converter employed in the sensor.

Abstract: A fire detecting system is disclosed, which comprises a sensor for producing an output voltage representing smoke level, heat, etc., and a comparator for producing a fire signal by comparing the output of the sensor or the differential or integral of the sensor output and a reference voltage. The sensor output or the differential or integral thereof is held in a peak hold circuit to be transferred through a switch to a sample-hold circuit for storage there.

Abstract: A novel signal transmission system, having a junction line comprised of a power source line, a grounding line and a signal line is disclosed. Two complementarily operative transistors are connected in series between the power source line and the grounding line. Signals are sent out from the junction point of the two transistors to the signal line. The speed for transmitting the signals is effectively increased due to the quick charge and discharge of the signal line.

Abstract: In a fire detector that includes a sensor for producing an output voltage corresponding to smoke concentration, temperature, etc., there is provided a charge-and-discharge circuit to be reset by the turning ON of a switching circuit which is made ON at a fixed voltage. The output of the charge-and-discharge circuit and the output of a sensor are applied to the switching circuit to vary the ON period of the switching circuit corresponding to the output voltage of the sensor. Any irregularity in the sensor can be monitored by changes in the ON period.

Abstract: A fire alarm system has a main unit and a plurality of sensor terminals in accordance with a polling system. The plurality of sensor terminals are divided into a plurality of groups. When a given sensor terminal of a given group is accessed and transmits digital data as response data indicating a smoke concentration or a temperature to the main unit, and the response data exceeds a first reference value thereby indicating that a fire has broken out, the main unit accesses other sensor terminals of the given group. If some of the response data therefrom exceed a second reference value which is equal to or smaller than the first reference value, the main unit counts the number of such sensor terminals. When the number exceeds a predetermined number, the main unit displays information indicating the existence of a fire.

Abstract: In a smoke detector of the type in which smoke is detected in a detection chamber based upon a variation of an ionization current flowing therein or a variation of light beam passing therethrough, there is provided a reference signal generating section which produces a reference signal having a predetermined characteristic corresponding to typical smoke flowing into the detection chamber when a fire occurs, and a signal comparison section which compares a detection signal detected in the detection chamber with the reference signal, wherein a smoke sensing signal is produced when the detection signal is determined as a signal due to a fire but is not produced when the detection signal is determined as the signal due to the entry of an insect into the detection chamber or due to cigarette's smoke flowing thereinto.

Abstract: When a receiver supplies both an address signal and a test instruction signal to a given terminal unit, a test voltage generator forming a sensor test circuit of this terminal unit supplies a predetermined test voltage to a corresponding sensor. This sensor generates an analog signal obtained by superimposing the test voltage on the normally detected voltage. The analog signal is A/D-converted, and a resultant digital signal is received by the receiver, thereby allowing a test for operating conditions of any sensor at the site of the receiver. The test voltage generator may generate a plurality of stepwise voltage components to readily check operating characteristics (e.g., overload characteristic) of the sensor.

Abstract: A temperature sensor has a series circuit of resistors, a gain control switch connected in parallel with one of the resistors of the series circuit, and a reference voltage control switch connected in parallel with a middle resistor of resistors of a reference voltage generation section. The reference voltage and the gain of an operational amplifier are variable so as to change the resolution of the output signal and/or a detected temperature range of the sensor.

Abstract: There is disclosed a method for hot lubricated metal extrusion in which a billet is extruded into a solid or tubular form by means of a die and/or a mandrel with an organic lubricant interposed within a container, the method comprising feeding a combustion improver or a mixture of a combustion improver and water into an extruded product thereby burning off the carbide of the lubricant deposited on the surfaces of the extruded product.

Abstract: A reaction apparatus for corrosive material includes a heat exchanger that is coupled to a header. A first inlet is provided for fluid raw material and a second inlet is provided for introducing a non-corrosive material. There is also an outlet for reaction products. A tube baffle is positioned across the interior of the heat exchanger in order to define an inner space therein and an inner member which substantially conforms to the configuration of the inner space is positioned therein in closely spaced relationship with the inside surface of the header. A first plurality of tubes are attached to opening formed in the baffle and a second plurality of tubes are attached to the inner member and are positioned correspondingly to the first tubes in spaced relation thereto and in fluid communication therewith.

Abstract: An aqueous urea solution is concentrated to a substantially water-free molten urea by conducting successively a first step of concentrating said aqueous urea solution under the conditions forming a urea slurry and a second step of concentrating said urea slurry under conditions forming a substantially water-free molten urea free from crystalline urea.

Abstract: A process for preparing alcohols which comprises hydrating lower olefins in liquid phase with an aqueous 0.1 to 20.0 wt % phosphoric acid solution containing 0.001 to 1.0 wt % of an oxyacid of chromium or a salt thereof to give corresponding alcohols.

Abstract: Unreacted ammonium carbamate contained in urea synthesis effluent obtained by reacting ammonia and carbon dioxide at urea synthesis pressures and temperatures is recovered by a method comprising subjecting the urea synthesis effluent to a three-stage decomposition to decompose the unreacted ammonium carbamate in each stage, the first stage and the second stage of which are operated at a gauge pressure of at least 30 kg/cm.sup.2 and a gauge pressure of from 10 to 25 kg/cm.sup.