Abstract: A composite fire detector (12) which senses a heat temperature, smoke concentration, and gas concentration due to fire is connected to a transmission path (16) drawn from a fire receiver (10). When a fire test operation is sensed by the fire receiver, a test mode is set to the fire detector. The fire detector performs display control over alarm indicating lights in a mutually varied manner corresponding to each alarm test when a test jig is used to conduct an alarm test by sensing of a heat temperature, an alarm test by sensing of a smoke concentration, and an alarm test by sensing of a gas concentration in a state where the test mode is set. For example, the fire detector repeats one-time blinking of the alarm indicating lights for heat sensing, two-time blinking for smoke sensing, and three-time blinking for gas sensing at intervals of a predetermined nonoperating period.

Abstract: A composite fire detector (12) which senses a heat temperature, smoke concentration, and gas concentration due to fire is connected to a transmission path (16) drawn from a fire receiver (10). When a fire test operation is sensed by the fire receiver, a test mode is set to the fire detector. The fire detector performs display control over alarm indicating lights in a mutually varied manner corresponding to each alarm test when a test jig is used to conduct an alarm test by sensing of a heat temperature, an alarm test by sensing of a smoke concentration, and an alarm test by sensing of a gas concentration in a state where the test mode is set. For example, the fire detector repeats one-time blinking of the alarm indicating lights for heat sensing, two-time blinking for smoke sensing, and three-time blinking for gas sensing at intervals of a predetermined nonoperating period.

Abstract: Rectangular positioning lands are formed on a circuit board, and rectangular positioning openings are formed in a metal mask. In addition, the positioning lands and positioning openings are formed such that their long side length becomes identical, and short side of the positioning opening becomes narrower than that of the positioning land. This enables to modify the deviation angle ? between the circuit board and the metal mask, and positional deviation in X and Y directions of the circuit board, during performing test printing, by modifying the position of the metal mask with respect to the circuit board, such that exposed excess parts, on which cream solder is not formed, are formed on the positioning lands, and the excess parts formed upper and lower sides of the cream solder mutually keep a constant spacing to become a same width.

Abstract: A detected information display system in a fire detecting system of the present invention which is equipped with detectors arranged in a warning area and a control panel and achieves a specified information display on a physical quantity detected by the detectors, includes a secondary conversion part to convert the physical quantity detected by the detector to the specified level, a conversion level storage part to store the converted level, an extraction part to extract the maximum level from the levels stored in the conversion level storage part, and a display part which is equipped with level display parts, and keeps the level display part corresponding to the converted level and the level display part corresponding to the maximum extracted level in a visually different condition from each other. The maximum detected physical quantity and the set value to indicate the abnormal level can be rapidly grasped, and the displays of a plurality of detectors can be displayed in an integrated and related manner.

Abstract: The present invention relates to a line fault monitor for detecting a short circuit in a terminal-side loop line and disconnecting the short-circuit portion from a power supply, so that the position of the short circuit can easily be specified. The line fault monitor includes at least one of a mid-point line monitoring device and a beginning/end line monitoring device. The mid-point line monitoring device has a first fault indicator lamp for indicating a fault in a line connected to one terminal, and a second fault indicator lamp for indicating a fault in a line connected to the other terminal. The beginning/end line monitoring device in the side of a receiver has a first fault indicator lamp for indicating a fault in a line connected to a beginning terminal, a second fault indicator lamp for indicating a fault in a line connected to an end terminal, and a representative fault indicator lamp for representatively indicating a fault in any one of the lines connected to the beginning and the end terminals.

Abstract: A disaster prevention monitor is disclosed in which the power consumption during a line monitoring process is reduced, and a disconnection or a short circuit of control lines can be detected by using a single switching means. A central station has a monitor command transmitter for transmitting a monitor command signal to initiate monitoring of power and control lines. A terminal or repeater station has circuitry for controlling the connection of control lines between a line monitor and power lines. During normal conditions, the control lines are not connected to the power lines, but become so connected only in response to a command from the central station. A line monitoring command causes generation of a negative voltage which is applied to line monitoring circuitry to actuate such circuitry for monitoring the status of the power and control lines.