JP6363356B2 - Smoke detector sensitivity test method, sensitivity test apparatus, and smoke detector - Google Patents

Description

  The present invention is a technology effective when applied to a sensitivity test method and a sensitivity test apparatus for a smoke detector having a function of detecting the occurrence of a fire by sensing that the concentration of the smoke that has entered reaches a predetermined threshold value. About.

  Conventional fire detectors include heat detectors and composite detectors in addition to smoke detectors. Among them, the smoke detector has a light emitting element and a light receiving element arranged in a smoke detection chamber called a dark box so that their optical axes cross each other, and light emitted from the light emitting element flows into the smoke detection chamber. In some cases, the light scattered by the particles is received by a light receiving element, and when it detects that the amount of received light has reached a predetermined level, it determines that a fire has occurred and outputs a fire alarm signal. .

  By the way, if the smoke detector has been used for many years, dust or dust accumulates or adheres to the inside of the dark box, and the sensitivity of the detector may change. Therefore, it is necessary to periodically inspect the smoke detector. In view of this, a portable sensitivity test apparatus that is brought into the installation site and inspects the sensitivity of the smoke detector has been developed and put into practical use. In addition, the sensitivity test apparatus includes a sensitivity test apparatus that inspects a sensor before shipment at a factory.

  Conventionally, various sensitivity-type sensitivity test apparatuses have been provided. For example, as shown in FIG. 6, the smoke detector 10 is provided with a test terminal P0, and a voltage is applied to the test terminal P0 from an external test apparatus. Is applied to the fire determination circuit 15 by adding the voltage applied to the terminal P0 to the voltage obtained by amplifying the signal from the light receiving element 12 by the amplifier 13 using the adders (diodes D1 and D2). However, there is a device that determines the performance (sensitivity) of a detector by examining how much voltage is applied from the outside and a fire alarm signal is output from the smoke detector.

  In addition, a smoke generator that actually generates smoke is installed inside, and the smoke concentration is generated by adjusting the concentration of generated smoke. There is also a sensitivity testing device designed to do this. As an invention related to such a sensitivity test apparatus, there is one disclosed in Patent Document 1, for example.

JP 2004-362352 A JP 2002-352348 A

Among the sensitivity test devices described above, the former device that tests the sensitivity by applying a voltage to the test terminal does not take into account the initial variation that the smoke detector originally has, so the characteristics of the individual smoke detectors The inspection according to the condition cannot be performed, and a highly reliable inspection result cannot be obtained. Further, since a test terminal for applying a voltage from the outside is required, there is a problem that the cost of the smoke detector is increased.
On the other hand, since the sensitivity test apparatus described in Patent Document 1 includes a smoke generator, the housing is large and inconvenient to carry, and it takes a long time to generate and stabilize smoke at a predetermined concentration. Therefore, when inspecting a plurality of smoke detectors, the total time required for inspection becomes very long, and there is a problem that a series of operations is complicated.

  The present invention has been made paying attention to the problems as described above, and its purpose is to perform inspection without providing a test terminal on the smoke detector or providing a smoke generator on the test device, Sensitivity test method and sensitivity test for smoke detectors that are easy to operate and can reduce the time required for inspections, and that can perform inspections according to the characteristics of individual smoke detectors and obtain highly reliable inspection results. It is to provide a device as well as a smoke detector.

  Note that the level of the background signal included in the received light signal is increased by increasing the gain of the amplification unit, so that the received light signal is generated when the smoke density necessary for the sensitivity test is detected in a pseudo manner. An invention relating to a sensitivity test apparatus for a smoke detector has been proposed in which a sensitivity test can be performed without causing a test to flow into a smoke detection chamber (Patent Document 2). However, the sensitivity test apparatus described in this document can reduce the influence of noise generated in the circuit by increasing the current of the light emitting element at the same time as increasing the gain of the amplification section, so that an accurate sensitivity test can be performed. Therefore, the present invention is different from the present invention in terms of problems and means for solving the problems.

In order to solve the above problems, the invention described in claim 1
A smoke density detecting means capable of detecting the concentration of the smoke that has entered, a function of outputting a signal for notifying a fire when the smoke density detected by the smoke density detecting means is a predetermined value or more, and a signal for notifying the fire A smoke detector having a terminal capable of outputting, and a function of determining whether or not the smoke density is a predetermined value or more based on a value obtained by adding a value input from the outside to an output value of the smoke density detecting means A sensitivity test method for determining sensitivity,
A signal for notifying the fire by monitoring the state of the terminal of the smoke detector after giving a determination execution command as to whether or not the smoke detector has a predetermined value and whether or not the smoke concentration is a predetermined value or more. The determination of whether or not it is output is repeated a plurality of times to determine the sensitivity of the smoke detector,
Wherein as the predetermined value, than the minimum value of the operating range Ri feed from a predetermined step value only low value to turn the smoke detector a high value by the step value min,
Before executing the determination of whether or not a signal notifying the fire is output by monitoring the state of the terminal of the smoke detector, the current output value of the smoke concentration detecting means is output to the smoke detector. Requesting output, and determining whether or not the current output value of the smoke density detection means output from the smoke detector is within a predetermined allowable range in response to the request, and the predetermined allowable range If it is not inside, it is determined that the sensitivity of the smoke detector is abnormal .

According to the first aspect of the present invention, it is possible to inspect whether or not the sensitivity of the smoke detector has changed without providing a smoke generator in the test apparatus. Since it does not need to be generated, the operation is easy and the time required for the inspection can be shortened.
According to the first aspect of the present invention, the current state output from the smoke detector before the execution of the determination as to whether or not the signal notifying the fire is output by monitoring the state of the smoke detector terminal. It is determined whether or not the output value of the smoke density detection means in the range is within a predetermined allowable range, and if it is not within the predetermined allowable range, it is determined that the sensitivity of the smoke detector is abnormal. For smoke detectors that are determined to be abnormal, a value that is higher by a predetermined step value is sequentially sent to the smoke detector to monitor the state of the smoke detector terminal and whether or not a signal to notify the fire has been output. The determination procedure can be omitted, thereby shortening the time required for the inspection.

The invention described in claim 2 is the smoke detector sensitivity test method according to claim 1,
The output value of the smoke concentration detection means in the absence of smoke and the smoke density value when it is determined that there is a fire are stored in the storage means inside the smoke detector, and the initial value and the fire alarm smoke. Store it as a density value,
Requests that the smoke detector output an initial value and a fire alarm smoke density value stored in the storage means after a predetermined period of time, and outputs information from the smoke detector in response to the request After receiving
Based on the initial value and the fire determination smoke density value output and received from the smoke detector, a value obtained by dividing a value obtained by subtracting the initial value from the fire determination smoke density value by a predetermined integer value is used as the step value. Decide
The determination execution command is given to the smoke detector and the determination as to whether or not the fire notification signal is output is repeated a plurality of times.

  According to the second aspect of the present invention, the step value for the repeated determination is determined based on the initial value output from the smoke detector and the fire determination smoke density value. It is possible to perform a corresponding inspection and obtain a highly reliable inspection result.

The invention according to claim 3
A fire alarm signal capable of detecting that a pair of terminals provided in a sensor equipped with a smoke concentration detection means capable of detecting the concentration of the inflowing smoke is externally monitored and a signal indicating a fire is output. Detection means;
Transmitting means for transmitting a signal for instructing the smoke detector to determine whether or not the predetermined value and the smoke density are equal to or higher than a predetermined value;
The transmission means receives information output from the smoke sensor in response to transmitting a signal requesting the sensor to output information stored in the storage means inside the sensor. Receiving means;
Sensitivity determination means for determining the sensitivity of the smoke detector according to the detection result of the fire alarm signal by the fire alarm signal detector;
With
The information output from the smoke detector includes the output value of the smoke concentration detection means in the absence of smoke and the value of smoke concentration when determined to be a fire,
The sensitivity determination means includes
Based on the output value and smoke density value received by the receiving means, a value obtained by subtracting the output value from the smoke density value divided by a predetermined integer value is determined as a step value;
By said transmitting means, said a predetermined value, the feed from the step value by less than the minimum value of the operating range to sequentially the smoke detector a high value by the step value min, the fire by the fire alert signal detecting means It is characterized in that the sensitivity of the smoke detector is determined according to the detection result of the alarm signal.

According to the third aspect of the present invention, it is possible to inspect whether or not the sensitivity of the smoke detector has changed without providing a smoke generator in the test apparatus. Since it does not need to be generated, the operation is easy and the time required for the inspection can be shortened.

Further, according to the invention described in claim 3, based on the initial output from the smoke detector values and fire determination smoke density value, to determine a step value during repeated determination of the individual smoke detector Inspections according to characteristics can be performed, and highly reliable inspection results can be obtained.

A fourth aspect of the present invention is the smoke detector sensitivity test apparatus according to the third aspect ,
It is provided with a notification means for performing notification in a human-recognizable mode, and the sensitivity determination means determines whether or not the transmission means has output a signal for monitoring the state of the terminal of the smoke detector and reporting a fire. Before executing the determination, a signal requesting that the smoke detector output the current output value of the smoke density detecting means is transmitted to the smoke detector, and the smoke detector outputs the signal in response to the request. It is determined whether or not the current output value of the smoke density detecting means is within a predetermined allowable range. If the output value is not within the predetermined allowable range, it is indicated that the sensitivity of the smoke detector is abnormal. The notification means is used for notification.

According to the fourth aspect of the present invention, when the current output value of the smoke density detection means output from the smoke detector is not within the predetermined allowable range, the sensitivity of the smoke detector is abnormal. Therefore, for smoke detectors that are determined to be abnormal, a value that is higher by a predetermined step value is sequentially sent to the smoke detector, and the signal at the terminal of the smoke detector is monitored to notify the fire. The procedure for determining whether or not the test has been performed can be omitted, thereby shortening the time required for the inspection.

The invention according to claim 5 is the smoke detector sensitivity test apparatus according to claim 3 or 4 ,
The terminal for transmitting a signal by the transmitting means is configured to be shared with the terminal for receiving a signal by the receiving means.
According to the fifth aspect of the present invention, the number of terminals provided in the sensitivity test apparatus can be reduced, whereby the apparatus can be downsized and carried easily.

The invention described in claim 6
Storage means capable of storing data;
A smoke concentration detecting means capable of detecting the concentration of the smoke flowing in;
Fire judgment means for judging whether or not the smoke density detected by the smoke density detection means is a predetermined value or more;
A fire alarm signal output means for outputting a fire alarm signal for notifying the occurrence of a fire when the fire determining means determines that the detected smoke concentration is a predetermined value or more;
A pair of terminals capable of outputting the fire alarm signal;
A smoke detector comprising:
The fire determination means has a function of decoding a command input to the pair of terminals from the outside, and the smoke concentration detection means when the command is input in accordance with a first command input from the outside to the pair of terminals. A function of storing the smoke density value detected by the storage means in the storage means, and a function of outputting the smoke density value stored in the storage means from the pair of terminals in accordance with the second command input to the pair of terminals. The smoke density is equal to or higher than a predetermined value based on a value obtained by adding an externally input test value to the output value of the smoke density detecting means upon receiving a determination execution command as to whether or not the smoke density is higher than a predetermined value. A function of determining whether or not.

According to the invention described in claim 6 , since it is possible to inspect whether or not the sensitivity of the smoke detector has changed without providing a test terminal on the smoke detector, the number of parts of the smoke detector can be reduced. Reduction and downsizing can be achieved.

According to the invention described in claim 6 , the external test apparatus reads the initial fire concentration value from the storage means inside the smoke detector to be tested before starting the test, and generates a test value corresponding to the value. Thus, since the sensitivity test can be performed, an inspection corresponding to the characteristics of each smoke detector can be performed, and a highly reliable inspection result can be obtained.

  According to the present invention, it is possible to realize a smoke detector sensitivity test method and test apparatus that can perform inspection without providing a smoke generator in the test apparatus, is easy to operate, and can shorten the time required for inspection. it can. In addition, it is possible to realize a smoke detector sensitivity test method and test apparatus that can perform inspections according to the characteristics of individual detectors and obtain highly reliable inspection results. Furthermore, the smoke detector can be inspected without providing a test terminal, and the smoke detector can be reduced in size.

It is a block diagram which shows one Embodiment of the smoke detector in which the test by the sensitivity test apparatus to which this invention is applied is possible. It is a block diagram which shows the sensitivity test apparatus of the smoke detector to which this invention is applied, and the connection state of this sensitivity test apparatus and smoke detector. It is a graph which shows the relationship between the smoke density at the time of shipment of the smoke detector in which the test by the sensitivity test apparatus to which this invention is applied, and the value which AD-converted the output of the light receiving element (smoke density detection element). The graph which shows the normal range of the value which AD converted the smoke density | concentration at the time of the test after progress of the predetermined period of the smoke detector which can test by the sensitivity test apparatus to which this invention is applied, and the output of a light receiving element (smoke density | concentration detection element). is there. It is a flowchart which shows an example of the procedure of the sensitivity test performed by the calculation control part (CPU) in the sensitivity test apparatus of embodiment. It is a block diagram which shows the example of 1 structure of the conventional smoke detector.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows an embodiment of a smoke detector that can be tested by a sensitivity test apparatus according to the present invention. The smoke detector of this embodiment includes a smoke detection chamber called a dark box, and a light emitting element and a light receiving element are arranged in the smoke detection chamber so that their optical axes intersect with each other. The received light is scattered by the smoke particles that flow into the smoke detection chamber and is received by the light receiving element. When it detects that the amount of received light has reached the specified level, it determines that a fire has occurred and outputs a fire alarm signal. Is configured to do.

In order to realize the function as described above, the smoke detector 10 in the present embodiment includes a light emitting element 11 and a light receiving element 12, and an amplifier 13 for amplifying a signal from the light receiving element 12, as shown in FIG. An AD conversion circuit 14 that converts a signal (analog signal) amplified by the amplifier 13 into a digital signal, and a fire determination circuit 15 that determines the occurrence of a fire based on an output value from the AD conversion circuit 14 are provided. . In the present embodiment, the light receiving element 12, the amplifier 13, and the AD conversion circuit 14 constitute smoke density detecting means.
The fire determination circuit 15 includes a microprocessor (CPU) and storage means such as a ROM (Read Only Memory) and a RAM (Random Access Memory). Further, in order to store initial values and the like to be described later, the fire determination circuit 15 includes a nonvolatile memory such as an electrically writable EEPROM or flash memory as a ROM or separately from the ROM. Good. The initial value may be stored in a RAM backed up by a battery.

  The smoke detector 10 includes a pair of terminals (line terminals and common terminals) 16a and 16b connected to a pair of wirings (line line L and common line C) disposed indoors, and a line line L. From the voltage (10 V to 32 V) applied to the common line C, the power supply circuit 17 used inside the sensor (3 V or 6 V) is generated and supplied to each internal circuit, or by the fire determination circuit 15 When the occurrence of a fire is detected, the impedance between the line L and the common line C is lowered (including a short circuit) to thereby notify a receiver (not shown) of the occurrence of the fire to a short circuit comprising a switch (not shown) Impedance switching means) 18, connected to the pair of terminals 16a and 16b connected to the line line L and the common line C, and receives signals (commands) input from the outside to the terminals. Or transmitted to the fire determining circuit 15 and includes a transceiver circuit 19 or send internal data to the outside.

FIG. 2 shows a configuration example of the smoke detector sensitivity test apparatus 20 according to the present invention and the connection relationship between the sensitivity test apparatus 20 and the smoke detector 10.
As shown in FIG. 2, the sensitivity test apparatus 20 of this embodiment includes a pair of terminals 21a and 21b corresponding to the terminals 16a and 16b of the smoke detector 10 connected to the line line L and the common line C, respectively. A transmission / reception circuit 22 for sending a pulse signal (command code) to the smoke detector 10 via the terminals 21a and 21b, and an arithmetic control unit 23 as a sensitivity determination means for performing calculations necessary for a sensitivity test, control of internal circuits, etc. Prepare. The arithmetic control unit 23 includes a microprocessor (CPU) and storage means such as a ROM (Read Only Memory) and a RAM (Random Access Memory).

  The sensitivity test apparatus 20 is connected to the pair of terminals 21a and 21b, and serves as a fire alarm signal detection means for determining whether or not a fire alarm signal is output from the smoke detector 10 based on the voltage between the terminals. A fire signal determination circuit 24, a power supply circuit 25 that receives a commercial AC voltage such as AC100V, generates a DC power supply voltage (3V or 6V) necessary for the operation of the internal circuit, and supplies it to each internal circuit, an arithmetic control unit 23, a display unit 26 including an LCD (liquid crystal panel) and an LED lamp for outputting a test result executed by the control unit 23, an input operation unit 27 including an operation button for inputting a command to the arithmetic control unit 23, and an arithmetic control unit 23. A sound output unit 28 such as a buzzer or a speaker that generates sound by the control of the is provided.

The acoustic output unit 28 is not essential and may be omitted. The power supply circuit 25 has a built-in battery, and when no AC voltage is supplied from the outside, the internal circuit is configured to be operable with a power supply voltage from the battery.
Generally, a smoke detector is provided with a terminal fitting (corresponding to a plug) for connecting the line L and the common line C so as to protrude from the back surface, and the smoke detector is provided on the mounting base for fixing to the wall of the building. An attachment fitting (corresponding to a socket) that can be coupled to and detached from the terminal fitting is provided, and can be attached to or detached from the attachment base by turning the main body of the smoke detector. Therefore, the sensor mounting portion of the sensitivity test apparatus 20 is provided with a base member having a fitting that can be connected to and detached from the smoke sensor terminal, similar to the mounting base, and the sensor can be easily attached during the test. It may be configured so that it can be attached to or detached from the base member of the attachment portion.

Next, the test procedure by the sensitivity test apparatus 20 shown in FIG. 2 will be described.
Note that the smoke detector 10 to be tested is subjected to a performance test at the time of shipment from the factory, and adjusted so as to have a characteristic close to the target characteristic as indicated by a solid line B in FIG. It shall have been. Further, the smoke detector 10 to be tested to which the present invention is applied has a memory therein, and the initial value of the detector measured in a performance test at the time of shipment from the factory (in the state without smoke). The output value of the AD conversion circuit corresponding to the output of the light receiving element 12) and the smoke density value when the sensor determines that a fire has occurred are stored.

More specifically, when the smoke detector 10 is shipped from the factory, a performance test is performed in which smoke of various concentrations is actually introduced to check the operation, and an initial value measurement or a predetermined smoke concentration (for example, FIG. As shown in 3, when it is 10% / m), it is determined that there is a fire, and an inspection is performed to determine whether or not to fire. When these values deviate from the target value, the internal circuit (correction value) is adjusted so as to approach the target value, and a product that cannot be adjusted is determined as a defective product. The initial value detected in the performance test and the smoke density value (digital value) when the fire is triggered are stored in the internal memory.
Note that the initial value of the sensor does not become zero because the light emitted from the light emitting element cannot be completely prevented from being reflected by the wall of the smoke detecting chamber and entering the light receiving element. The reason is considered that it is difficult to make the structure so that no light from outside enters inside because the entrance is provided. Therefore, the design of the smoke detection chamber labyrinth structure color and surface treatment may be devised so that the initial value is intentionally set to a predetermined value.

On the other hand, when the smoke detector 10 is installed in a facility such as a building or factory after a predetermined period of time, it is determined whether the characteristics have deteriorated. Therefore, as shown in FIG. It has normal operating characteristics such as checking whether it is within D0max and issuing a fire within a normal fire judgment range TDmin to TDmax such as 10% / m ± 2% / m in terms of smoke concentration. An inspection of whether or not
In addition to the decrease in sensitivity due to dust and dirt adhering to the light emitting element and light receiving element lenses, the sensitivity of the detector changes, and the reflected light increases due to dust and dirt adhering to the wall of the smoke detection chamber. May increase sensitivity. FIG. 4 shows the concentration detection characteristics of the sensor when the sensitivity increases.
Also, the sensitivity test apparatus 20 may calculate the lower limit value TDmin and the upper limit value TDmax of the normal fire determination range based on the fire alarm smoke density value TD received from the smoke detector 10 during the sensitivity test, for example. Alternatively, a predetermined value that is determined in advance may be used. Similarly, the lower limit value D0min and the upper limit value D0max of the allowable range of the initial value may be determined based on the initial value D0 received from the smoke detector 10, or a prescribed value may be used.
Here, if the fire determination circuit 15 of the smoke detector 10 determines that a fire has occurred according to the normal fire determination range, the detector will operate (fire alert), so the “normal fire determination range” is “operation range”. In other words.

FIG. 5 shows an example of a sensitivity test procedure of the smoke detector 10 by the calculation control unit 23 of the sensitivity test apparatus 20 of FIG. In the sensitivity test by the sensitivity test apparatus 20, the smoke detector installed on the ceiling of the building is removed from the mounting base and mounted on the mounting portion of the sensitivity test apparatus 20.
In the sensitivity test by the arithmetic control unit 23, as shown in FIG. 3, the initial value D0 stored in the internal memory and the fire are first detected by the transmission / reception circuit 22 for the fire determination circuit (CPU) 15 of the smoke detector 10. A command requesting the return of the notification smoke density value TD and the value of the AD converter circuit (current value of the sensor) corresponding to the output of the light receiving element 12 in the current state (no smoke) is transmitted (step S1). . Then, it waits for a reply from the sensor 10 for a predetermined time (for example, 1 second) considering the time required for transmission / reception, and receives the transmitted data (step S2). Note that the above three data may be requested in one command transmission, but the command and data may be transmitted and received in three steps.

  Next, the arithmetic control unit 23 determines whether or not the received current value of the sensor is within a range D0min to D0max allowed for the initial value (step S3). If it is determined that the current value does not fall within the range D0min to D0max allowed for the initial value (No), the process proceeds to step S14, and the display unit 26 indicates that the sensor is abnormal. Is displayed, and the sound output unit 28 is activated to generate an abnormal sound.

On the other hand, if it is determined in step S3 that the current value is within the range D0min to D0max allowed for the initial value (Yes), the process proceeds to step S4, and the initial value D0 received in step S2 and the fire alarm are transmitted. A sensitivity value A (= TD−D0) is obtained from the smoke density value TD, and a step value ΔS (equivalent to 5% of A) is calculated based on the sensitivity value A, for example, by an equation of A / 20. A value obtained by subtracting the step value ΔS and the initial value D0 from the determination value TDmin (= TDmin−ΔS−D0) is calculated as the test value E.
The reason for subtracting the initial value D0 when calculating the test value E is that the fire determination circuit 15 adds the test value E to the AD conversion value, that is, Dr, of the output of the light receiving element during the current test that has changed over time. This is because the fire is judged based on the measured value. Therefore, TDmin-ΔS is the maximum value of the substantial inoperative range.

  Subsequently, the arithmetic control unit 23 transmits the test value E calculated in step S4 and the test execution command to the fire determination circuit (CPU) 15 of the smoke detector 10 (step S5). Here, the test execution command is a command for adding the test value E to the current value Dr of the sensor and instructing the fire determination based on the value (= Dr + TDmin−ΔS−D0). Therefore, when the smoke detector 10 receives the test value E and the test execution command, the smoke detector 10 compares the value of (Dr + TDmin−ΔS−D0) with TD to determine fire. At this time, if the sensitivity of the sensor does not change, the current value Dr should be the same as the initial value D0, so the smoke sensor 10 compares the value of (TDmin−ΔS) with TD. The fire will be judged. If the sensitivity of the sensor has not changed, the fire determination circuit 15 of the smoke sensor 10 should determine that no fire has occurred.

Therefore, the arithmetic control unit 23 monitors whether the fire signal determination circuit 24 detects the fire alarm signal within a predetermined time (for example, 1 second) after the command transmission, that is, whether the fire alarm signal is output from the smoke detector. (Step S6). The fire signal determination circuit 24 monitors the voltage at the terminals 21a and 21b, the fire determination circuit 15 of the smoke detector 10 determines that a fire has occurred, and activates the short circuit 16 to change the impedance between the terminals 16a and 16b. When the voltage is lowered, the voltage between the terminals 21a and 21b becomes small, so that it is possible to recognize that the smoke detector 10 has fired.
Therefore, if it is determined in the monitoring in step S6 that the smoke detector 10 has fired, it is determined that the smoke detector 10 to be tested will fire with a smoke concentration lower than the minimum fire judgment value TDmin. Can do. Therefore, in the process of FIG. 3, when it is determined in the monitoring in step S6 that the smoke detector 10 has fired (step S7; Yes), the process proceeds to step S14 and the display unit 26 detects an abnormality. Is displayed, and the sound output unit 28 is activated to generate an abnormal sound (step S6 → S14).

On the other hand, if it is determined by monitoring in step S6 that the smoke detector 10 has not fired (step S7; No), the process proceeds to step S8, and the arithmetic control unit 23 calculates the test value calculated in step S5. A value obtained by adding one step value ΔS to E (= TDmin−ΔS−D0) (= TDmin−D0) is set as a new test value E. That is, the minimum value of the operating range.
Subsequently, the arithmetic control unit 23 transmits the test value E calculated in step S8 and the test execution command to the fire determination circuit (CPU) 15 of the smoke detector 10, and a predetermined time after the command transmission (for example, It is monitored whether the fire signal determination circuit 24 detects a fire alarm signal within 1 second) (step S9). If it is determined that the smoke detector 10 has fired (step S10; Yes), the process proceeds to step S13, and a message indicating that the detector is normal is displayed on the display unit 26, and the sound is also heard. The output unit 28 is activated to generate a normal sound (steps S10 → S13).

If it is determined by monitoring in step S9 that the smoke detector 10 has not fired (step S10; No), the process proceeds to step S11, where the arithmetic control unit 23 calculates the test value calculated in step S8. A value obtained by adding one step value ΔS to E (= TDmin−D0) (= TDmin−D0 + ΔS) is set as a new test value E (step S11).
Subsequently, the arithmetic control unit 23 determines whether or not the calculated test value E is larger than the maximum fire determination value TDmax (step S12). If it is determined that the test value E is not greater than the maximum fire determination value TDmax (No), the process returns to step S9 to the fire determination circuit (CPU) 15 of the smoke detector 10 in step S11. The calculated test value E and the test execution command are transmitted, and it is monitored whether or not the fire signal determination circuit 24 determines that there is a fire signal within a predetermined time (for example, 1 second) after transmitting the command.

If it is determined in step S10 that the smoke detector 10 has fired (Yes), the process proceeds to step S13 and a message indicating that the detector is normal is displayed on the display unit 26. The sound output unit 28 is activated to generate a normal sound (step S10 → S13).
On the other hand, if the calculation control unit 23 determines in step S12 that the test value E is larger than the maximum fire determination value TDmax (Yes), the sensor has smoke with a concentration higher than the normal fire determination range TDmin to TDmax. This means that the fire alarm signal is not output even if it is detected, so that the process proceeds to step S14 and a message indicating that the sensor is abnormal is displayed on the display unit 26 and the sound output unit 28 is sounded. Thus, an abnormal sound is generated (steps S12 → S14).

As described above, the sensitivity tester 20 of the present embodiment uses the sensitivity value A (= TD−D0) from the initial value D0 and the fire alarm smoke density value TD stored in the target sensor before the start of the test. A step value ΔS (= A / 20) is calculated based on the sensitivity value A, and a test value E is determined according to the step value ΔS and transmitted to the sensor. by detecting whether fire alert by each test value while stepwise increments step is added to the current value to send to the sensor, the sensitivity of the detector is contained in the operating range of the Jo Tokoro Judging whether there is. Therefore, it is possible to make a determination according to the characteristics of each smoke detector to be tested, and there is an advantage that a highly accurate determination result can be obtained.

  Although the invention made by the present inventor has been specifically described based on the embodiment, the present invention is not limited to the embodiment. For example, in the above embodiment, A / 20 is used as a calculation formula for the step value ΔS for determining the test value E to be transmitted to the sensor. However, the calculation formula is not limited to this, and “10” or “ Other values such as “25” may be used as the denominator. The step value ΔS may be a fixed value without depending on the characteristics of the sensor to be tested.

  Furthermore, in the sensitivity test processing of FIG. 5, when the test value is larger than the maximum fire judgment value TDmax when the test value is transmitted from the test apparatus to the smoke detector to be tested and the fire alarm signal is output, Although it is judged that the sensor is abnormal and the abnormality is notified (step S12 → S14), the smoke concentration corresponding to the test value when the fire alarm signal is output and the factory shipment received in step S2 The fire detection smoke density at the time may be compared and it may be determined that the sensor is abnormal when there is a difference of a predetermined value or more.

  In the above embodiment, the transmission / reception circuit 19 provided in the smoke detector and the transmission / reception circuit 22 provided in the sensitivity test apparatus are configured to transmit and receive data and commands to each other by a wired communication method. As the transmission / reception circuits 19 and 22, those that transmit and receive data and commands by a wireless communication method may be used.

Furthermore, in the above embodiment, the AD conversion circuit 14 is provided between the amplifier 13 of the smoke detector 10 and the fire determination circuit 15 to convert the detected density value into a digital value and then compare it with the determination reference value TD. However, the DA converter circuit that converts the test value E transmitted from the sensitivity test device into the smoke detector 10 into an analog value, and the adder that adds the converted value and the output value of the amplifier 13 (see FIG. 6). And a comparator for comparing the value after addition with the judgment reference value (analog voltage), and in the test, the fire judgment circuit 15 sequentially switches the judgment reference value of the comparator step by step in accordance with the above embodiment. You may comprise so that determination of a sensitivity may be performed.
In the above description, the present invention has been described by taking as an example the case where the present invention is applied to a smoke sensor and its sensitivity test apparatus. However, the sensor is a composite sensor having a heat sensing function in addition to a smoke sensing function. Even in this case, the present invention can be applied.

10 Smoke detector (monitoring device)
DESCRIPTION OF SYMBOLS 11 Light emitting element 12 Light receiving element 13 Amplifier 14 AD conversion circuit 15 Fire judgment circuit 18 Short circuit (switch circuit)
19 Transmission / Reception Circuit 20 Sensitivity Test Device 22 Transmission / Reception Circuit 23 Operation Control Unit 24 Fire Signal Determination Circuit (Fire Alarm Signal Detection Means)

Claims (6)

A smoke density detecting means capable of detecting the concentration of the smoke that has entered, a function of outputting a signal for notifying a fire when the smoke density detected by the smoke density detecting means is a predetermined value or more, and a signal for notifying the fire A smoke detector having a terminal capable of outputting, and a function of determining whether or not the smoke density is a predetermined value or more based on a value obtained by adding a value input from the outside to an output value of the smoke density detecting means A sensitivity test method for determining sensitivity,
A signal for notifying the fire by monitoring the state of the terminal of the smoke detector after giving a determination execution command as to whether or not the smoke detector has a predetermined value and whether or not the smoke concentration is a predetermined value or more. The determination of whether or not it is output is repeated a plurality of times to determine the sensitivity of the smoke detector,
Wherein as the predetermined value, than the minimum value of the operating range Ri feed from a predetermined step value only low value to turn the smoke detector a high value by the step value min,
Before executing the determination of whether or not a signal notifying the fire is output by monitoring the state of the terminal of the smoke detector, the current output value of the smoke concentration detecting means is output to the smoke detector. Requesting output, and determining whether or not the current output value of the smoke density detection means output from the smoke detector is within a predetermined allowable range in response to the request, and the predetermined allowable range A smoke detector sensitivity test method, comprising determining that the sensitivity of the smoke detector is abnormal when not inside . The output value of the smoke concentration detection means in the absence of smoke and the smoke density value when it is determined that there is a fire are stored in the storage means inside the smoke detector, and the initial value and the fire alarm smoke. Store it as a density value,
Requests that the smoke detector output an initial value and a fire alarm smoke density value stored in the storage means after a predetermined period of time, and outputs information from the smoke detector in response to the request After receiving
Based on the initial value and the fire determination smoke density value output and received from the smoke detector, a value obtained by dividing a value obtained by subtracting the initial value from the fire determination smoke density value by a predetermined integer value is used as the step value. Decide
2. The method for testing sensitivity of a smoke detector according to claim 1, wherein the determination of whether or not the determination execution command is given to the smoke detector and the signal for notifying the fire is output a plurality of times. A fire alarm signal capable of detecting that a pair of terminals provided in a sensor equipped with a smoke concentration detection means capable of detecting the concentration of the inflowing smoke is externally monitored and a signal indicating a fire is output. Detection means;
Transmitting means for transmitting a signal for instructing the smoke detector to determine whether or not the predetermined value and the smoke density are equal to or higher than a predetermined value;
The transmission means receives information output from the smoke sensor in response to transmitting a signal requesting the sensor to output information stored in the storage means inside the sensor. Receiving means;
Sensitivity determination means for determining the sensitivity of the smoke detector according to the detection result of the fire alarm signal by the fire alarm signal detector;
With
The information output from the smoke detector includes the output value of the smoke concentration detection means in the absence of smoke and the value of smoke concentration when determined to be a fire,
The sensitivity determination means includes
Based on the output value and smoke density value received by the receiving means, a value obtained by subtracting the output value from the smoke density value divided by a predetermined integer value is determined as a step value;
By said transmitting means, said a predetermined value, the feed from the step value by less than the minimum value of the operating range to sequentially the smoke detector a high value by the step value min, the fire by the fire alert signal detecting means A smoke detector sensitivity test apparatus, comprising: determining a sensitivity of the smoke detector according to a detection result of an alarm signal. It is provided with a notification means for performing notification in a human-recognizable mode, and the sensitivity determination means determines whether or not the transmission means has output a signal for monitoring the state of the terminal of the smoke detector and reporting a fire. Before executing the determination, a signal requesting that the smoke detector output the current output value of the smoke density detecting means is transmitted to the smoke detector, and the smoke detector outputs the signal in response to the request. It is determined whether or not the current output value of the smoke density detecting means is within a predetermined allowable range. If the output value is not within the predetermined allowable range, it is indicated that the sensitivity of the smoke detector is abnormal. 4. The smoke detector sensitivity test apparatus according to claim 3 , wherein the notification means is used for notification. The smoke detector sensitivity test apparatus according to claim 3 or 4 , wherein a terminal for transmitting a signal by the transmitting means is shared with a terminal for receiving a signal by the receiving means. Storage means capable of storing data;
A smoke concentration detecting means capable of detecting the concentration of the smoke flowing in;
Fire judgment means for judging whether or not the smoke density detected by the smoke density detection means is a predetermined value or more;
A fire alarm signal output means for outputting a fire alarm signal for notifying the occurrence of a fire when the fire determining means determines that the detected smoke concentration is a predetermined value or more;
A pair of terminals capable of outputting the fire alarm signal;
A smoke detector comprising:
The fire determination means has a function of decoding a command input to the pair of terminals from the outside, and the smoke concentration detection means when the command is input in accordance with a first command input from the outside to the pair of terminals. A function of storing the smoke density value detected by the storage means in the storage means, and a function of outputting the smoke density value stored in the storage means from the pair of terminals in accordance with the second command input to the pair of terminals. The smoke density is equal to or higher than a predetermined value based on a value obtained by adding an externally input test value to the output value of the smoke density detecting means upon receiving a determination execution command as to whether or not the smoke density is higher than a predetermined value. And a smoke detector.

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