RU20799U1 - DEVICE FOR MONITORING THE STATE OF THE SECURITY AND / OR FIRE ALARM SYSTEM - Google Patents

Description

DEVICE FOR MONITORING THE STATE OF THE SECURITY SYSTEM and / or

FIRE ALARM

The useful model relates to the field of automation, more specifically to security and fire alarm systems, in particular to devices for monitoring the status of security and fire alarm systems.

Known alarm systems, for example US Pat. USA No. 3 772 667, G 08 V, in which a constant survey of the sensors included in the loop from the receiver is carried out. Such systems allow you to individually determine the status of each sensor, to identify the nature of the defects in the loop and their location. However, such systems are complex and uneconomical.

A device for checking fire and alarm systems implemented in a method for checking fire and alarm systems using an event recorder is known (WO 09808205, G 08 B 29/10, 26. 02. 98). The method allows to check fire and emergency alarm. Such a system typically contains alarm devices, such as audible or flash lamps, that can be checked regularly. The check is based on the current levels at the input and output, as well as the output sound and visual signals of the alarm device.

A device for detecting events with the ability to control faults (WO 972 2957, G 08 B 13/19, 26. 06. 97.), we have chosen for the prototype. The device has a sensor that generates an output signal when an event is detected, and a fault monitoring system. This system has a comparator, which compares the sensor output signal with a threshold signal and activates the processor when the sensor output signal is greater than the threshold signal in the first case. The processor activates the fault indication circuit after a certain time interval if the sensor generates an event detection signal in the second case within this time interval.

The disadvantages of this device include the fact that it cannot be used in various signaling loops, for example, bipolar, fire alarms. In addition, the device is quite difficult to perform.

This problem is solved in that the device for monitoring the state of the security and / or fire alarm system, comprising a rectifier, a comparator and an indication unit, is equipped with an integrating RC circuit, a key element, a current sensor and a voltage divider, while the rectifier input is connected to the first input bus, and its output is connected to the first input of the RC circuit, the output of which is connected to the input of the display unit, the output of which is connected to the input of the comparator, the output of which is connected to the input of the key element, the output of which is connected through the second input a bus with a different input of the RC circuit, the input of the current sensor is connected to the output of the comparator, and its outputs are connected one to the key element, the other to the second input bus, one output of the voltage divider is connected to one of the inputs of the comparator, and the other output is connected to the second input bus.

The essence of the utility model is illustrated in the drawing, where in FIG. 1 presents a block diagram of the inventive device.

The device contains:

1- rectifier;

2- integrator) skinny RC - chain;

3- display unit;

4- comparator;

5- key element;

6- current sensor;

7- voltage divider;

8- first input bus;

9- second input bus.

The device operates as follows.

The voltage on the first input bus 8 leads to an increase in the voltage at the output of the integrating RC circuit 2, which is applied through the display unit 3 to the first input of the comparator 4. When the voltage at the first input of the comparator 4 exceeds the voltage at its second input (this is the output of the voltage divider 7 ), the comparator 4 turns on and current flows from the output of the integrating RC circuit 2 through the indicating unit 3 to the input of the comparator 4 and through its output to the current sensor 6. The LED of the indicating unit is switched on. In this case, the voltage occurring at the current sensor 6 includes a key element 5 connecting the input of the integrating RC circuit 2 to the second input bus 9, excluding the input current of the integrating RC circuit 2, therefore there is no voltage at the output of the integrating circuit 2, the discharge time is determined by the value the capacitor of the integrating circuit and the resistance of the display unit. When

the voltage at the output of the integrating RC - circuit 2 drops to a level of about 3B, then the comparator 4 turns off, as a result of which the voltage at the output of the current sensor 6 disappears, the key element 5 also turns off. The indicator on display unit 3 also turns off. The voltage of the first input bus 8 is applied to the input of the integrating RC circuit 2, and the described operation cycle of the device is repeated.

Thus, pulsed switching on of the indicator with a low average current consumption of the device (20 - 30 μA) is provided. The frequency of the flashes and their intensity are determined by the parameters of the integrating circuit, voltage divider and display unit. In the event of a faulty signal loop circuit (open or short), the voltage on the input buses of the device is reduced or absent and, therefore, the indicator does not periodically turn on.

Claims (1)

A device for monitoring the state of the security and / or fire alarm system, comprising a rectifier, a comparator and an indication unit, characterized in that it is equipped with an integrating RC circuit, a key element, a current sensor and a voltage divider, while the rectifier input is connected to the first input bus, and its output is connected to the first input of the RC circuit, the output of which is connected to the input of the display unit, the output of which is connected to the input of the comparator, the output of which is connected to the input of the key element, the output of which is connected through the second input a bus with another RC-circuit input, the input of the current sensor is connected to the output of the comparator, and one of its outputs is connected to the key element, the other to the input bus, the input of the voltage divider is connected to the first input bus, and the output of the voltage divider is connected to one of the inputs a comparator, and the other output is connected to the second input bus.