JP3094202B2 - Remote sensor inspection system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a remote inspection system for a sensor that can remotely inspect a sensor used in a fire alarm device, and particularly to a fire alarm device installed in an apartment house or the like. Related to a remote inspection system for sensors.

[0002]

2. Description of the Related Art Conventionally, a fire alarm device has been installed in a control room, a security room, or the like, a pair of lines extending from the receiver, and connected between the lines to be placed in a watched area. Generally, it is composed of a fire detector. When such a fire alarm device is installed in, for example, an apartment house or the like, a fire detector is naturally installed in each house.

[0003] Incidentally, the fire alarm device is required to check the function of a fire detector and the like at regular intervals. Inspection of the fire detectors is usually performed at the site by operating the detectors one by one using a detector tester (smoke generator, heating tester, etc.).

[0004] However, in the case of a fire alarm system installed in an apartment house, such an inspection method needs to be carried out by entering each house one by one, and in many cases, the resident is away. In some cases, it was refused to enter, and there was a problem that the inspection test could not be performed efficiently.

Therefore, in recent years, even a fire alarm device installed in such a place uses a fire detector having an inspection function, and an inspection device (outdoor inspection display device) is provided outside the house. In addition, a system for checking fire detectors installed in each house without entering the house has been adopted.

On the other hand, an on-off type fire detector which has been frequently used for a long time, when detecting a fire phenomenon (heat, smoke, etc.), conducts a pair of lines with a lower impedance than usual and receives an operation signal. Since the signal is sent to the device, it is impossible for the receiver to identify which fire detector has been activated on the same line (a pair of lines). Therefore, even if a test function is added to such an on-off type fire detector and the detector is inspected by remote control, if at least one fire detector connected to the same line operates, In addition, even if an operation test of another sensor is performed, it is impossible to identify whether or not the operation has been performed on the receiver side. Therefore, after performing an operation check of one fire detector, it is necessary to restore the alarm state on the receiver side.

In addition, a heating circuit and a circuit capable of transmitting a test signal to a subsequent stage are added to such an on / off type fire detector having a test function, and the fire detector is connected to a test signal line. Inspection systems have been proposed in which the fire detectors are connected in series so that test signals are sequentially applied to the respective fire detectors, and the fire detectors are sequentially inspected (for example, Japanese Patent Publication No. Hei 6 (1994)).
-64662).

[0008]

Among the above-mentioned inspection systems, the former requires a recovery operation on the receiver side every time the fire detector is inspected, and the inspection work of a plurality of fire detectors is required. There was a drawback that it took time to perform. The latter of the above inspection systems requires a heating circuit in the fire detector and a sending circuit for sending a test signal to the rear end, and the configuration of the sending circuit is complicated, and In addition, since a heat generation circuit is used, it takes a long time to reach a certain amount of heat generation, and the larger the number of fire detectors, the longer the inspection.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a remote sensor inspection system which solves the above-mentioned drawbacks and which can be inspected reliably and in a short time with a simple circuit configuration.

[0010]

[MEANS FOR SOLVING THE PROBLEMS] To achieve the above object
A remote inspection system for a sensor according to the first aspect of the present invention.
System between a pair of tracks connected to a repeater or receiver.
Connect multiple sensors in parallel, and use the sensors and test signals
Cable and connect the test signal from the checker
Remote inspection of sensors that perform inspection test by applying to test signal line
The system, wherein the sensor comprises an input-side test signal line.
Test when operated by the test signal input from
So that signals can be output to the output test signal line.
Each sensor is connected in series with a test signal line and
Connect a terminating resistor at the terminal, andMachine
At the time of inspection, a pair of tracks to which the above sensors were connected
To be connected to the inspection device side, and
Circuit to enable alarm action by detection signal from detector
The tester configures all of the above sensing
When the operation status of the relay is detected,
The receiver is configured to output a detection signal to the receiver.
To check the inspection test results using the alarm action
A remote inspection system for detectors, characterized in that:

In the invention according to claim 2, the sensor is:
A detection unit that detects a fire phenomenon and outputs a detection signal when a detection level is equal to or higher than a predetermined level or when a test signal is applied, and a signal output that outputs a conduction signal based on the detection signal output by the detection unit. And a progressive circuit for supplying a test signal to a subsequent sensor when the conduction signal is being output.

In the invention according to claim 3, the test signal line is sequentially wired through a progressive circuit of a sensor, and is connected to one of the pair of lines via a terminating resistor at a terminating end. It is a feature.

According to a fourth aspect of the present invention, the repeater or the receiver includes a sensor operation detection circuit for detecting a conduction signal of the sensor through a pair of lines, and a detection signal of the sensor operation detection circuit. And a changeover switch for disconnecting the pair of lines from the sensor operation detection circuit and connecting to the checker when the checker is connected. Is what you do.

[0014] In the invention according to claim 5, the inspection device is
A test switch for starting an inspection test, a sensor current supply circuit for supplying power to the sensor via the pair of lines, and a test signal output to the test signal line, whereby the sensor operates normally. A test current detection circuit for detecting a predetermined test current flowing by the test signal and outputting an operation signal to the repeater or the receiver.

[0015]

According to the first aspect of the present invention, at the time of inspection, in the repeater or the receiver, first, a pair of lines to which the sensor is connected is switched to the inspector side. Next, a test signal is sent from the checker to the test signal line via the repeater or the receiver. Then, a test signal is applied to the first sensor, and when the sensor operates, the test signal is sent to the next sensor. When the detectors operate one after another, a test signal is finally applied to the terminating resistor. This allows
The checker can detect that all the sensors operate normally from the current flowing through the terminating resistor. Then, the checker outputs a detection signal to the repeater or the receiver. This causes the receiver to sound an alarm. Thereby, it can be checked that each sensor is normal.

According to the second aspect of the present invention, the sensor normally detects a fire phenomenon and outputs a detection signal from the detection unit when the detection level is equal to or higher than a predetermined level. The detection unit also outputs a detection signal when a test signal is applied. The signal output circuit outputs a conduction signal according to the detection signal output by the detection unit. The progressive circuit detects that the conduction signal is output, and at this time, the progressive circuit
The test signal is supplied to a subsequent sensor.

According to the third aspect of the present invention, the test signal line is sequentially wired via a progressive circuit of the sensor, and is connected to one of the pair of lines via a terminating resistor at a terminating end. Therefore, if the sensor connected to the test signal line is normal, the test signal is applied to the terminating resistor.

According to the fourth aspect of the present invention, in the repeater or the receiver, at the time of inspection, the changeover switch is operated by the changeover switch.
A pair of lines are disconnected from the detector operation detection circuit and connected to the inspection device. When an operation signal is input from the inspection device, the detector operation detection circuit detects the signal as a conduction signal. The detection signal of the detector operation detection circuit is displayed as an alarm in an alarm section. Usually, a pair of lines are connected to a sensor operation detection circuit, and a conduction signal from the sensor can be detected.

In the invention according to claim 5, the inspection device is
To start the inspection test, press the test switch. Also, power is supplied from the sensor current supply circuit to the sensor via the pair of lines. A test signal is output to the test signal line, and the sensor operates normally and a predetermined test current flowing by the test signal is detected by a test current detection circuit. The operation signal detected by the test current detection circuit is provided to the repeater or the receiver.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiments. FIG. 1 is a block diagram showing an embodiment of a sensor remote inspection system according to the present invention. In this figure,
The remote inspection system of the detector is roughly divided into the fire detector 1
_{1, 1 2, ..., 1} N (N is an arbitrary integer), a pair of lines 2a, 2b and the test signal line _{3 1, 3 2, ...,} 3 N + 1
(N is an arbitrary integer), a terminating resistor 4, a repeater 5, a receiver 6, an outdoor indicator 7, and a checker 8 and are connected as follows. Have been.

Here, the pair of lines 2a and 2b extend from the terminals LS and CM of the repeater 5. A plurality of fire detectors 11, ₁ are provided between the pair of lines 2a, 2b.
_{1 2,} ..., 1 _N are connected in parallel. One or more of these fire detectors 1 ₁ , 1 ₂ ,..., 1 _N are installed in each house. Furthermore, the fire sensor 1 _1, when operated by the test signal inputted via the terminal T ₁ from the test signal line 3 _1, the test signal terminal T ₂ output-side test signal line 3 via a ₂ can be output.
Fire sensor 1 _2, when operated by the test signal inputted via the terminal T ₁ from the test signal line 3 _2, the test signal at the output test signal lines 3 ₃ through the terminal T ₂ It can output. ............ Fire detector 1
_N, upon operation by the test signal inputted via the terminal T ₁ from the test signal line 3 _N, to allow output the test signal through the terminal T ₂ to the output-side test signal lines 3 _{N + 1} Has become. The end of the test signal line _{3N + 1} is connected to the line 2b via the terminating resistor 4.

In the repeater 5, signal / power supply lines 9a and 9b are connected to terminals LO and CM, and signal lines 10a and 1b are connected to terminals TS and TC.
0b are respectively connected. These signal lines 9a, 9
b, 10a, row cormorants receiver unit 6 is connected to the fire monitoring alarm to 10b. Also, during the fire detector inspection test,
An inspection device 8 is connected to the repeater 5 via terminals Tt, LR, CM, and LD. This repeater 5
, Upon inspection, the fire detector _{1 1, 1 2, ...,} 1 N
The pair of lines 2a and 2b connected to the inspection device 8 are switched and connected to the inspection device 8 side, and the alarm operation can be performed by a detection signal from the inspection device 8.

The receiver unit 6 is provided with an alarm unit for fire alarm display based on the fire signal from the relay device 5 Medium. Further, receiving <br/> Shin machine 6, outdoor display 7 is connected to and partially outdoor display 7 of the alarm display function by Utsurishin signal from receiver unit 6
But it is displayed. Note that the receiver unit 6,
A commercial power supply (AC100V) is supplied.

The inspection device 8 can output a detection signal to the repeater 5 when detecting the operation states of all the sensors by a test signal. FIG.
FIG. 2 is a circuit diagram showing an example of a fire detector used in the embodiment. In this figure, each fire detector 1 ₁ , 1 ₂ ,
, _1N have the same configuration, and will be described as a fire detector 1. The fire detector 1 includes a detection unit 11, a signal output circuit 12, and a forward feeding circuit 13. These configurations will be described below.

The detecting section 11 includes resistors R1 to R6, a transistor TR1, a thermistor Th, and a voltage comparing circuit CP.
1 is provided. Here, thermistor T that senses heat
The series circuit of h and the resistor R1 is connected between the terminals LSS and CM. A series circuit of a resistor R2, a resistor R3 and a resistor R4 is connected between the terminals LSS and CM. A connection between the thermistor Th and the resistor R1 is connected to one input terminal of the voltage comparison circuit CP1. The connection between the resistors R2 and R3 is connected to the other input terminal of the voltage comparison circuit CP1. Further, one power supply terminal of the voltage comparison circuit CP1 is connected to the terminal CM via the resistor R4, and the other power supply terminal is connected to the terminal LSS. The collector of the transistor TR1 is connected to the connection between the resistors R2 and R3 via a resistor R5. The emitter of the transistor TR1 is connected to the terminal CM. The base of the transistor TR1 is connected to the terminal CM via the resistor R6 and to the test terminal T1 via the resistor R7. As described above, the detection unit 11
Is configured.

The output terminal of the detection unit 11 (the output terminal of the voltage comparison circuit CP1) is connected to the base of the transistor TR2 of the signal output circuit 12 via the resistor R8. This signal output circuit 12 includes resistors R8 to R11.
, Capacitors C1 and C2, transistor TR2,
It has a Zener diode ZD1 and a light emitting diode LD1. The cathode of the Zener diode ZD1 is connected to the terminal LS, and the anode is connected to the terminal CM. Similarly, a capacitor C2 is connected between the terminals CM and LS. Further, the collector of the transistor TR2 is connected to the terminal LS, and the emitter is connected to the terminal CM via a series circuit of the resistor R10 and the light emitting diode LD1. A resistor R11 is connected between the terminals LS and LSS. A capacitor C1 is connected to the terminals LSS and CM. The signal output circuit 12 is configured as described above.

The forward transfer circuit 13 includes a transistor TR3. The base of the transistor TR3 is connected to the emitter of the transistor TR2 via the resistor R9. The collector of the transistor TR3 is connected to the test terminal T1, and the emitter is connected to the test terminal T3.
The progressive circuit 13 is configured as described above.

FIG. 3 is a circuit diagram showing a repeater used in the embodiment. In this figure, the repeater 5 includes a detector operation detection circuit 51, a stabilized power supply circuit 52, a signal output circuit 53, and a changeover switch 54. In this embodiment, the relay 5 is not provided with an alarm unit, but may be provided with an alarm unit.

Here, the detector operation detection circuit 51 is connected to the fire detectors 11 ₁ , 12 ₂ , 11 ₂ via a pair of lines 2 a, 2 b.
..., and detects the continuity signal of 1 _N, or may detect the same signal by the detection signal from the inspection device 8. The detector operation detection circuit 51 includes resistors R11 to R24, transistors TR11 and TR12, and capacitors C11 and C12.
, Switching element SR, voltage comparison circuit CP11,
It comprises a CP12 and a diode D11. Terminal LST
Is connected to one fixed pole of the changeover switch 54. The terminal LST has a cathode of a diode D11, a terminal LR, and a voltage comparison circuit CP via a resistor R11.
11 and a terminal LS via a resistor R12.
U is connected. The other fixed pole of the changeover switch 54 is connected to the terminal LD. The movable pole of the changeover switch 54 is connected to the terminal LS. Transistor T
The emitter of R11 is connected to the anode of diode D11. The collector of the transistor TR11 is connected to the terminal LSU, and via the resistor R13.
Connected to its base. The base of the transistor TR11 is connected to the collector of the transistor TR12. The emitter of the transistor TR12 is connected to the terminal CM.
It is connected to the. A series circuit including a resistor R14, a PUT switching element SR, and resistors R15 and R16 is connected between the terminal LSU and the terminal CM. The anode of the switching element SR is connected to the resistor CM and to the terminal CM via the capacitor C11. The cathode of the switching element SR is connected to the resistor R15. The connection point between the resistors R17 and R18 is connected to the gate of the switching element SR.
The series circuit of the resistors R17 and R18 includes a terminal LSU and a terminal C.
M. The resistors R14 to R18, the capacitor C11, and the switching element SR constitute a pulse oscillation circuit, and apply an intermittent pulse to the base of the transistor TR12. The series circuit of the resistors R19 and R20 has a terminal L
It is connected between SU and terminal CM. The resistor R19,
The connection point of R20 is connected to the other input terminal of the voltage comparison circuit CP11. The output terminal of the voltage comparison circuit CP11 is connected to the terminal CM via a series circuit of the resistors R21 and R22. A capacitor C12 is connected to the resistor R22. The series circuit of the resistors R23 and R24 is connected between the terminal LSU and the terminal CM.
The connection point of the resistors R23 and R24 is connected to the voltage comparison circuit CP12.
Connected to one of the input terminals. Voltage comparison circuit CP
12 has a capacitor C12 and a resistor R
Twenty-one connection points are connected. Further, the voltage comparison circuit C
The output terminal of P12 is the output terminal of the detector operation detection circuit 51.

[0030] The stabilized power supply circuit 52, terminals LSU pair of signal-power supply line 9a from the receiver unit 6, 9b, terminal LO, the power supplied through the CM, and a predetermined power supply voltage
, And is configured as follows. That is, the stabilized power supply circuit 52 includes the transistor TR13
, A resistor R25, and a Zener diode ZD11. The anode of the Zener diode ZD11 is connected to the terminal CM. In addition, Zener diode ZD
The cathode of the transistor 11 is connected to the base of the transistor TR13. The emitter of the transistor TR13 is connected to the terminal LSU. The collector of the transistor TR13 is connected to the base via the resistor R25 and to the terminal LO.

[0031] The signal output circuit 53 is a circuit which outputs a fire signal terminal LO, the CM to receive machine 6 conductive for a predetermined impedance based on the detection signal from the sensor operation detector 51, the following It is configured as follows. That is, the signal output circuit 53 includes the transistor TR14, the resistors R26 and R27, and the Zener diode ZD12. The cathode of the Zener diode ZD12 is connected to the terminal LO, and the anode is connected to the collector of the transistor TR14. The emitter of the transistor TR16 is connected to the terminal CM. Transistor TR14
Is connected to a detector operation detection circuit 5 via a resistor R26.
1 output terminal (output terminal of the voltage comparison circuit CP12) and to the terminal CM via the resistor R27.

The changeover switch 54 connects the terminal LS to the terminal LST or the terminal LD of the sensor operation detecting circuit 51. When the checker 8 is connected,
The switching can be performed automatically or manually.

[0033] The switch SW is the time inspection is turned on, the terminal TS, is supplied to the receiver unit 6 via the TC, is being inspected test receiver unit 6 as a signal indicating the It is being supplied. As a result, the receiver is treated as an alarm process by an inspection test different from a true fire alarm.

FIG. 4 is a circuit diagram showing an inspection device used in the embodiment. In this figure, a checker 8 supplies a power supply unit 81 including a battery and a constant voltage power supply circuit, and power from the power supply unit 81 to a terminal LD, and outputs the fire detectors 1 ₁ , 1 ₂ ,
..., a sensor power supply circuit 82 for lighting the indicator lamp LD22 when it detects the operation of 1 _N, and outputs the terminal Tt into the test voltage (signal) on the basis of the voltage from the power supply unit 81, the supply of the test voltage When a predetermined test current by the terminating resistor 4 is detected, the indicator lamp LD23 is turned on, and the terminals LR,
And a test current detection circuit 83 that conducts between the CMs and outputs a detection signal.

The power supply section 81 includes a battery E and a resistor R2.
2, R23, a light emitting diode LD21, a Zener diode ZD21, a transistor TR21, and a test switch SWs. The positive electrode of the battery E is connected to one end of the test switch SWs. The test switch S
The other end of Ws is connected to one end of each of the resistors R21 and R22 and the collector of the transistor TR21. The base of the transistor TR21 is connected to the cathode of the Zener diode ZD21 and the other end of the resistor R22. The anode of the Zener diode ZD21 is connected to the terminal CM. The other end of the resistor R21 is connected to the light emitting diode LD2.
1 anode. The cathode of the light emitting diode LD21 is connected to the terminal CM. The negative electrode of the battery E is connected to the terminal CM. The emitter of the transistor TR21 is connected to a sensor power supply circuit 82.
Are connected to the test current detection circuit 83.

The detector power supply circuit 82 includes a resistor R2
3 to R25, the transistor TR22, and the diode D
21 and a light emitting diode LD22. That is, the anode of the diode D21 is connected to the emitter of the transistor TR21 of the power supply unit 81 via the resistor R23. This emitter has a transistor TR22
Are connected. The base of the transistor TR22 is connected to the anode of the diode D21 via the resistor R23. The collector of the transistor TR22 is connected to the anode of the light emitting diode LD22. The cathode of the light emitting diode LD22 is connected to a resistor R25.
Is connected to the terminal CM. Diode D21
Is connected to the terminal LD.

The test current detection circuit 83 includes a resistor R26
To R31, transistors TR23 and TR24, light emitting diodes LD23 and LD24, and diode D22,
D23. That is, the anode of the diode D22 is connected to the transistor T of the power supply unit 81 via the resistor R29.
It is connected to the emitter of R21. The cathode is connected to the terminal Tt. The anode of the diode D22 is connected via a resistor R30 to a Zener diode ZD2.
2 are connected to two anodes. This diode ZD2
2 is connected to the base of the transistor TR23. The emitter of the transistor TR23 is connected to the emitter of the transistor TR21 of the power supply unit 81. The collector of the transistor TR23 is connected to the anode of the light emitting diode LD23. In addition, the cathode of the light emitting diode LD23 is connected to the terminal CM via the resistor R26 and to the base of the transistor TR24 via the resistor R27. The base of the transistor TR24 is further connected to a terminal CM via a resistor R28, and its emitter is connected to the terminal CM. The collector of the transistor TR24 is
It is connected to the cathode of the light emitting diode LD24.
The anode of the light emitting diode LD24 is connected to the cathode of the diode D23 via the resistor R31. The anode of the diode D23 is connected to the terminal LR.

The operation of remotely checking the fire detector in the fire alarm apparatus thus configured will be described. <Normal Fire Monitoring Operation> In normal fire monitoring, the terminal LS of the repeater 5 is connected to the changeover switch 54. Is connected to the detector operation detecting circuit 51. Here, the fire detector 1 _1, 1 2, _..., and one or more of the 1 _N detects a fire phenomenon. That is, it is assumed that the resistance value of the thermistor Th of the fire detector 1 changes, and the voltage comparison circuit CP1 detects the change and turns on the transistor TR2. Then, the terminal LS−
Collector and emitter of transistor TR2—resistance R10
-A closed circuit of the light emitting diode LD1 and the terminal CM is formed. Therefore, the terminals LS and C of the repeater 5
Between M, it conducts with predetermined impedance.
On the other hand, the transistor TR11 is
Are turned on intermittently, so they are turned off intermittently. When the transistor TR11 is off, the terminal L
The potential of ST drops, and this voltage drop is detected by the voltage comparison circuit C.
A pulse signal is output upon detection by P11. When the operating current of the fire detector continues, the voltage comparison circuit C
A pulse signal is output intermittently from P11 and the resistance R21
And continuously outputs a pulse signal. When the voltage of the capacitor C12 exceeds a predetermined value, a high-level signal is output to the output terminal of the voltage comparison circuit CP12 to turn on the transistor TR14. .
As described above, in the detector operation detection circuit 51 of the repeater 5,
By the action of the capacitor C12 and the resistor 21, when the operation current of the fire detector is continuously detected for a predetermined time, the transistor TR14 is turned on. As a result, it is determined that a fire has occurred (accumulation determination). Then, the collector-emitter terminals LO- Zener diode ZD12- transistor TR14 - will be closed circuit that terminal CM is formed, the terminal LO, the CM turned on, transmit a fire signal to the receiver unit 6. Receiver unit 6, based on the fire signal from the repeater 5 performs fire alarm display operation. Further, the receiver transfers the alarm signal to the outdoor display, and the alarm is also displayed on the outdoor display 7.

<Remote Inspection Operation> Next, when performing a remote inspection of the fire detectors 1 ₁ , 1 ₂ ,..., 1 _N , first, the inspector 8 is connected to the repeater 5. When the checker 8 is connected to the repeater 5, the changeover switch 54 is automatically or manually switched, and the terminal LS is connected to the terminal LD. At the same time, the switch SW is closed to turn on the terminals TS and TC. This terminal T
S, by the on state between TC, the receiving apparatus 6 side, it is possible to know that it is being inspected.

Then, the test switch SWs of the checker 8 is turned on. Then, the sensor power supply circuit 82 and the terminal LD
So that the power is supplied to the test signal lines 3 ₁ through. Thus, closest to the repeater 5, the test signal is applied to the first fire detector 1 ₁ test terminal T1. If the fire detector is normal, the transistor TR1 is turned on, and the divided voltage of the resistors R2 and R3 for applying the comparison voltage is changed. As a result, the fire detection voltage is output from the voltage comparison circuit CP1. The detection voltage turns on the transistor TR2, turns on the light emitting diode LD1, and supplies a current to the base of the transistor TR3. Then, the transistor TR3 is turned on, and a test signal applied to the test terminal T1 is output to the test terminal T2. Accordingly, the next stage of the fire detector _{1 second} terminals T1,
Test signal is applied moves to inspection test of the next fire detector 1 _2. Thus, sequentially, the fire detector _{1 3, 1} 4, ...,
A _1N functional check is performed. As a result of this inspection, when all the fire detectors 1 ₁ , 1 ₂ ,..., 1 _N are sequentially operated normally, the test terminal T ₂ of the fire detector 1 _N is connected to the terminal resistor 4.
Will be applied to the test signal. Therefore, a predetermined test current flows through the terminating resistor 4.

This test current is detected by the resistor R29 of the test current detection circuit 83. That is, when a large test current flows and the voltage generated in the resistor R29 becomes larger than a predetermined value (the Zener voltage of the Zener diode ZD22), the transistor TR23 is turned on, and the light emitting diode LD23 is turned on. This allows
It indicates that the functions of all fire detectors by the checker 8 are normal.

At this time, a voltage is applied to the base of the transistor TR24, the transistor TR24 is turned on, and the terminals LR and CM are turned on, and the relay 5 is equivalent to the operation signal of the fire detector. Is output.

As described above, when the terminals LR and CM to which the checker 8 is connected are turned on in the repeater 5, the detector operation detection circuit 51 sets the detection state in the same manner as when the fire detector operates. Fire signal from the signal output circuit 53
There will be transmitted to the receiving machine 6.

[0044] In addition, the fire signal from the repeater 5, also alarm display in receiving <br/> signal generator 6 and outdoor display 7, the fire sensor _{1 1,} 1 2, ..., inspection test of _{1 N} It is possible to confirm that it is normal by displaying an alarm.

If the test current is not detected within a predetermined time after the start of the test, the line 2a,
Fire detector ₁ 1 connected to _2b, 1 _{2, ...,} it can be seen that there is a defect in _{1 N.}

In this embodiment, as described above, the inspection device 8
Test signals (voltages) from the fire detectors 1 ₁ , 1
_2, ..., 1 is applied to the _N, if all of the fire detector performs a sequential operation inspection operated normally, the first inspection device 8 side,
Or, receiving device 6 (or repeaters 5) at the side, by displaying the operation state, it is possible to perform the functional check confirmation of a fire detector. Further, in this embodiment, since there is no heating portion and all are simple electronic circuits, the test result can be obtained in a short time.

FIG. 5 is a block diagram showing another embodiment of the present invention. Another embodiment shown in this drawing, which has to be connected to inspect unit 8 to the receiver unit 6A directly, and the other configuration is the same as that of the first embodiment. In another embodiment ,
The receiver unit 6A, such as shown in the first embodiment, only different from the first embodiment in that previously allowed with the functions of the changeover switch 54. Therefore, the same reference numerals are given and the description is omitted.

Even in such another embodiment, the same operation and effect as those of the first embodiment can be obtained. Another embodiment has an advantage that a repeater is not required.

FIG. 6 is a circuit diagram showing another configuration example of the fire detector. The fire detector 1A shown in this figure differs from the fire detector 1 shown in the first embodiment in the configuration of a signal output circuit 12A and the configuration of a progressive circuit 13A. That is, in the signal output circuit 12A, the output terminal of the voltage comparison circuit CP1 is connected to the terminal CM via a series circuit including the resistors 12 and R13. The connection point between the resistors 12 and R13 is connected to the base of the transistor TR2.
Its emitter is connected to terminal CM. The collector is connected to the cathode of the light emitting diode Ld1 of the photocoupler PH. The anode of the light emitting diode Ld1 is connected to the anode of the Zener diode ZD2. The cathode of the Zener diode ZD2 is connected to the terminal LS. Only such a connection is different from the signal output circuit 12 of the first embodiment, and the other configuration is completely the same as the signal output circuit 12.

In the forward circuit 13A, a phototransistor Tr1 of a photocoupler PH is connected instead of the transistor TR3. The light emitting diode Ld1 and the phototransistor Tr1 are connected by light.

In the fire detector 1A, the signal output circuit 1
2A is a terminal LS to which a pair of lines 2a and 2b are connected,
An operation signal is output by conducting between the CMs with a predetermined impedance. When the signal output circuit 12A is outputting an operation signal, the light emitting diode Ld of the photocoupler PH
1 emits light. Thus, the phototransistor Tr1 of the photocoupler PH becomes conductive. Thereby, the test signal applied to the test terminal T1 of the fire detector 1A is
Passes through test terminal T2.

When a test voltage is applied to the test terminal T1, the comparison voltage is changed by turning on the transistor TR1 via the resistor R7, and the temperature is detected when the thermistor Th detects a predetermined temperature. And outputs a detection signal in the same manner.

[0053]

As described above, according to the first aspect of the present invention, at the time of inspection, the on / off type detectors are sequentially tested by an external test signal, and all the sensors connected to the line are detected. Inspection test can be easily performed because the normal operation of the detector can be detected, there is almost no restriction on the number of connection of the sensor, and the circuit configuration to be added can be simple. And the test time can be shortened.

Further, according to the first aspect of the present invention, all the sensors can be tested from the outside, so that the present invention is suitable for a fire alarm device for an apartment house.

According to the second aspect of the present invention, normally, a fire phenomenon can be detected, and when a test signal is input, if the sensor is normal, the test signal can be supplied to a subsequent sensor. Therefore, the sensor can be optimally used for remote inspection.

According to the third aspect of the present invention, the test signal line is sequentially wired through the progressive circuit of the sensor.
Since the terminal is connected to one of the pair of lines via the terminating resistor at the terminating end, a test signal will be applied to the terminating resistor, and if the inspection is normal, a predetermined current may flow through the test signal line. it can.

According to the fourth aspect of the present invention, in the repeater or the receiver, at the time of inspection, the pair of lines can be disconnected from the detector operation detection circuit and connected to the inspector by the changeover switch, and the test can be performed. Since the test signal is given to the fire detector side, it can be detected as a conduction signal when a test signal is input from the inspection device, and the normality or abnormality of the detector can be confirmed by the alarm unit.

In the invention according to claim 5, the inspection device is
A test signal is output to a test signal line, and a predetermined test current flowing by the test signal when the sensor operates normally is detected by a test current detection circuit and supplied to the repeater or the receiver. Since the inspection result can be confirmed by the repeater or the receiver, and the acoustic device is not required, the test device can be lightened.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a first embodiment of a remote inspection system for a sensor according to the present invention.

FIG. 2 is a circuit diagram showing a configuration example of a sensor used in the embodiment.

FIG. 3 is a circuit diagram showing a configuration example of a repeater used in the embodiment.

FIG. 4 is a circuit diagram showing a configuration example of an inspection device used in the embodiment.

FIG. 5 is a block diagram showing another embodiment of the present invention.

FIG. 6 is a circuit diagram showing another configuration example of the sensor.

[Explanation of symbols]

_{1 1, 1 2, ...,} 1 N fire detectors 2a, 2b line _{3 1, 3 2, ...,} 3 N + 1 test signal line 4 terminating resistor 5 repeater 6 receiver unit 7 outdoor display 8 inspection device 9a, 9b signal / power line 10a, 10b signal line

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-1-197899 (JP, A) JP-A-5-282581 (JP, A) JP-A-2-292698 (JP, A) (58) Field (Int. Cl. ⁷ , DB name) G08B 17/00-31/00

Claims (5)

(57) [Claims] 1. A plurality of sensors are connected in parallel between a pair of lines connected to a repeater or a receiver, and are connected in series by a sensor and a test signal line to transmit a test signal from an inspector. A remote inspection system for a sensor that performs an inspection test by applying to the test signal line, wherein the sensor outputs the test signal when operated by a test signal input from an input-side test signal line. It is configured to be output to the side test signal line, and each sensor is connected to a terminating resistor connected in series with terminated with test signal lines, the repeater or receiver, during inspection, the detector Is connected to the inspection device side so as to be switched, and a circuit is configured so that an alarm operation can be performed by a detection signal from the inspection device. The operating state of the above sensor A detector configured to output a detection signal to the repeater or the receiver directly upon detection, wherein a check operation test result can be confirmed using an alarm operation of the receiver. Remote inspection system. 2. A detector for detecting a fire phenomenon and outputting a detection signal when a detection level is equal to or higher than a predetermined level or when a test signal is applied, and a detection signal output by the detector. 2. The sensing device according to claim 1, further comprising: a signal output circuit that outputs a conduction signal based on the signal, and a forward circuit that supplies a test signal to a subsequent sensor when the conduction signal is output. Vessel remote inspection system. 3. The test signal line is sequentially wired through a progressive circuit of a sensor, and is connected to one of the pair of lines at a terminating end via a terminating resistor. A remote inspection system for the sensor as described. 4. The sensor according to claim 1, wherein the repeater or the receiver detects a conduction signal of the sensor through a pair of lines, and displays an alarm based on the detection signal of the sensor operation detection circuit. 2. The alarm device according to claim 1, further comprising an alarm unit, and a changeover switch for disconnecting the pair of lines from the sensor operation detection circuit and connecting to the inspector when the inspector is connected. Remote sensor inspection system. 5. The tester includes a test switch for starting a test, a sensor current supply circuit for supplying power to the sensor via the pair of lines, and a test signal output to the test signal line. And a test current detection circuit for operating the sensor normally and detecting a predetermined test current flowing according to the test signal, and outputting an operation signal to the repeater or the receiver. Item 2. A remote inspection system for a sensor according to Item 1.