RU2001438C1 - Alarm device - Google Patents

Abstract

The invention relates to alarm devices and can be used for alarms when entering enclosed spaces. The aim of the invention is to simplify the device. The device comprises a transistor 1, a switching contact of a sensor 2, a transistor 3, a resistor 4, a relay 5, a transistor 6. The device monitors the state of the object and monitors the operability of the communication line (open). 1 ill.

Description

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The invention relates to watchdog devices and can be used for signaling when entering a locked room.

The closest in technical essence to the proposed device is a device for signaling the position of the mechanism, in which there are signal cells, each of which contains a switching contact of the sensor, two LEDs, two transistors and four resistors.

The device monitors the state of the object and monitors the serviceability of the communication line (open).

The disadvantages of such a device are its complexity, which leads to a decrease in reliability.

The purpose of the invention is to simplify the device.

The drawing shows an electrical diagram of an alarm device.

The alarm device contains a transistor 1, a switching contact of the sensor 2, a transistor 3, a resistor 4,

Claims (2)

The claims ALARM DEVICE, comprising a sensor switching contact, two transistors, a resistor, positive and negative potential buses, characterized in that, in order to simplify the device, a relay and a third transistor are introduced into it, a positive potential bus is connected to the emitter of the first transistor and the first output of the sensor switching contact, the second output of which connected to emit 0 5 0 5 relay 5, transistor 6, bus 7, 8 of positive and negative potential. The device operates as follows. With the object door closed, the base and emitter of transistor 1 are closed by the make contact of the object status indicator 2. Transistor 1 is closed. Transistor 3 is also closed, but its emitter has the same potential as the base of transistor 1 due to transistor 6. When the make contact of sensor 2 opens, transistor 1 opens and relay 5 turns on. The same happens when the communication line with the object is cut off. When the NC contact of the sensor 2 is closed, the transistor 3 opens and turns on the same relay 5. The same happens when the wires of the communication line with the object are short-circuited. In both cases, the control current of the base of the transistors is set by the same resistor 4, but it is completely consumed by either transistor 1 or transistor 3. (56) Copyright certificate of the USSR No. 995106, cl. G 08 B 23/00, 1981. the second and the base of the third transistors, the third terminal of the sensor switching contact is connected to the base of the first and emitter of the third transistors, the collectors of the first and second transistors are connected to one terminal of the relay winding, the base of the second and the collector of the third transistors are connected to one terminal of the resistor, other terminals of the resistor and winding relays are connected to the negative potential bus.