JPS59218594A - Alarm with inspecting function - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an alarm device with an inspection function that automatically performs inspection at all times among various alarm devices.

BACKGROUND ART Various alarm devices have been used for gas, fire, smoke, water, crime prevention, etc. All of these devices have sensors that detect changes in conditions and issue alarms, or operate other devices in conjunction with the detected output. However, in general, the objects of this type of alarm rarely cause abnormalities, and it is normal for the alarm to not operate at all times. Therefore, if a malfunction occurs in the alarm itself, it will not be known, and therefore, when an abnormality occurs in the object, the alarm will not operate at all, which may lead to a serious accident.

This invention has been developed in consideration of the above-mentioned points, and is designed to periodically check the operation inside the alarm. This invention will be explained below with reference to the drawings.

The drawing shows an embodiment of the present invention. Reference numeral 1 denotes a sensor which, for example, in the case of a gas alarm, outputs an output when there is a gas leak. 2 is a comparator, which has input terminals 2A and 2B;
The output of the sensor 1 is applied to the input end 2A, and the battery 3 that generates the reference value S is connected to the input end 2B. An amplifier 4 amplifies the output of the comparator 2. 5 is and gate,
As will be described later, the output of the amplifier 4 is passed only when the gate is open. Reference numeral 6 denotes a notification unit such as a buzzer, and the operation of this unit notifies that the sensor has been activated, that is, that an abnormality has occurred in the object. 7 is a commercial power supply, 8 is a time base, and 9 is a control judgment circuit. For example, from the sine wave voltage of the commercial power supply 7 to the time base 8,
Pulses are sent to the control judgment circuit 9 at predetermined time intervals, such as three times a day or three times a day. The control judgment circuit 9 applies this as a check pulse P to the input terminal 2A of the comparator 2, and at the same time applies the check pulse inverted by the inverter 10 to the other input terminal of the AND gate 5. 11 is Inspection IIJ Chibu, and Gate 12. It is composed of an or gate 13°.

Next, the operation will be explained.

When the check pulse P is not output from the control judgment circuit 9,
The output of the inverter 10 is 1'', and the output of the inverter 10 is 5
．． +2 is open.

Therefore, if an abnormality occurs in the object and an output is output from the sensor 1, if this output is larger than the reference value S, an output is output from the comparator 2, amplified by the amplifier 4, and passed through the AND gate 5 to the notification section. 6 to notify that an abnormality has occurred. Then, the output of the AND gate 5 is applied to the control judgment circuit 9 to prevent the inspection operation from being performed.

On the other hand, under normal conditions when no abnormality occurs, no output is output from the sensor 1, but a check pulse P is output from the control judgment circuit 9 at predetermined intervals. Since the value of the check pulse P is larger than the reference value S, if comparator 2 and amplifier 4 are normal, amplifier 4
Output is output.

In other words, a signal of "1" is applied to one of the input terminals of Antoges 1 and 12. On the other hand, since a check pulse P is applied to the input side of the inverter 1o, its output becomes "o" and closes Antoges 1 and 5. to prevent the alarm unit 6 from operating, and also to the other input terminal of the AND CATE 12.
'' is added.Therefore, no output is output from ANDKATE 12. That is, if comparator 2 and amplifier 4 are normal, inspection alarm section 11 does not operate.

If comparator 2. If there is an abnormality in the amplifier 4, no output will be output from the amplifier 4, so the control determination circuit 9 determines that this output is not output, and outputs an inspection abnormality signal Q. This inspection abnormality signal Q passes through the OR gate 13 and activates the notification section 6 to notify that the alarm itself is malfunctioning.

At the same time, the control judgment circuit 9 maintains this state until the next check pulse P is applied.

As described above, self-inspection is performed by generating the inspection pulse P at a predetermined time 4η, and if the sensor 1 has an output, the inspection is stopped.

Note that if the check pulse P is generated from the commercial power source 7, it will be easier to cause a surge than when the check pulse P is generated from the DC power source, but since a reset is required every time the check pulse P is generated, the malfunction display due to the surge will continue. Never. Furthermore, - each gate in the above embodiment is not limited to this, and other gates may be used.

As explained in detail above, this invention is designed to self-diagnose by generating an inspection pulse every hour, so constant inspection can be performed, and if there is an abnormality in the alarm itself, it can be immediately notified, and the object It will not become inoperable when an abnormality occurs.

Therefore, the high reliability required as an alarm device can be obtained.

Further, since the notification section is used in common with the inspection notification, the structure is simplified and costs can be reduced.

[Brief explanation of drawings]

The drawing is a block diagram showing an embodiment of the present invention. In the figure, 1 is a sensor, 2 is a comparator, 3 is a battery, 4 is an amplifier, 5 is an AND gate, 6 is a notification section, 7 is a commercial power supply, 8 is a time base, 9 is a control judgment circuit, 1o is an input -Evening,
Reference numeral 11 is an inspection alarm unit, 12 is an antge=1·, and ]3 is an or gate.

Claims (1)

[Claims] An alarm device comprising a sensor, a comparator that compares the output value of the sensor with a reference value and outputs an output, an amplifier that amplifies the output of the comparator, and a notification section that operates with the output of the amplifier, A check pulse generating means generates a check pulse at predetermined time intervals and applies the check pulse to the sensor side input terminal of the comparator; a gate inserted in the front stage of the notification section; 1. An inspection function-equipped alarm, comprising: a means for closing the alarm, and an inspection alarm section that is activated when no output is output from the amplifier when the inspection pulse is generated, and activates the alarm section.