JP2612750B2 - Light-emitting sensitivity tester for photoelectric smoke detector - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a sensitivity tester for a photoelectric smoke detector for performing a sensitivity test of a photoelectric smoke detector.

[Conventional technology and its problems]

Conventionally, as described in Japanese Patent Publication No. 50-28320, a photoelectric smoke sensor uses a test method that uses noise light due to irregular reflection generated in synchronization with a flash in a dark box of the sensor in normal times. This test method uses an amplifier that amplifies the signal of the smoke detection light-receiving element in the sensor and a switching circuit that operates based on the output signal of the amplifier. In this method, the sensitivity is electrically measured by electrically operating the sensor by electrically increasing the operating level to the operating level, and measuring the voltage applied to the input of the switching circuit at that time. However, this test method is a test method in which a voltage is applied to a switching circuit or the like, and is not necessarily a comprehensive test method that includes even the light receiving capability of the smoke detecting light receiving element. Further, in this test method, it is necessary to provide a terminal for voltage application or the like to the sensor body, and if this function is not provided, the sensitivity must be actually measured using smoke. When smoke is used, the concentration of the smoke must be changed, the operation is complicated, skill is required, and at the same time, the test equipment becomes large and the handling is troublesome.

[Means for solving]

The present invention focuses on the property that a photoelectric smoke detector may malfunction due to strong light from a camera flash or the like, and aims to solve this problem by emitting light from the outside to the photoelectric smoke detector. A sensitivity tester for a photoelectric smoke detector, comprising: a light source unit that emits light to the detector; and a control unit that controls light emission of the light source unit and variably controls a light emission amount. It is characterized by the following. Further, there is provided a means for driving the light source unit to emit light in synchronization with light leakage or electromagnetic waves generated when the light emitting element for smoke detection of the photoelectric smoke detector emits light or a synchronization signal.

(Operation)

The present invention, as a method of performing a sensitivity test of the photoelectric smoke sensor, as a sensitivity test is performed by irradiating light to the sensor and receiving the light to the smoke detection light receiving element of the sensor,
Comprehensive operation can be confirmed as compared with the conventional test method, and a special function is not required for the sensor. Therefore, the sensor can be used as it is for the conventional sensor.

〔Example〕

FIG. 1 is a schematic sectional view of a test box according to one embodiment of the present invention. A base 3 of the sensor is fixed in advance to a lid 2 of a test box 1 for blocking external light, and a photoelectric smoke detector 4 for performing a sensitivity test is mounted thereon. A light source 6 such as a halogen lamp capable of emitting a large amount of light is disposed in front of a wire mesh 5 covering a dark box (not shown) for detecting smoke of the sensor 4. The position of the photoelectric smoke detector 4 is determined by positioning the base 3 of the various sensors so that the distance between the wire mesh 5 of the detector 4 and the light source 6 is constant, and the lid 2 attached is prepared. Forming the lid 2 with such various types of bases 3 is to keep the distance L between the detector 4 to be tested and the light source 6 constant, to increase the displacement of the base 3 when replacing it, This is for keeping the direction of the vessel constant. The light source 6 is attached to the support rod 7 and is movable up and down, and the height is adjusted to the position of the wire mesh 5 of the photoelectric smoke detector 4.

FIG. 2 is an operation display section of the test box 1, 8 is a power switch, 9 is a power indicator, 10 is a variable resistance knob for changing the light emission amount of the light source 6, and 11 is a voltage applied to the light source 6. A voltmeter 12 to be displayed is an operation indicator light that lights up when the sensor 4 operates. The operation is performed by turning on the power switch (test switch) 8 and confirming the lighting of the power indicator lamp 9. Next, turn the variable resistance knob 10 to increase the light emission amount of the light source 6 in the test box 1 and check the voltage with the voltmeter 11 while checking the operation indicator.
Continue increasing the light emission gradually until 12 lights up. When the operation indicator light 12 lights up, the rotation of the variable resistance knob 10 is stopped,
Using the value of the voltmeter 11 at that time as sensitivity, it is determined whether the sensor is normal or abnormal based on a comparison table for each sensor. When performing again, the sensor 4 is restored by the restoration switch 13.

FIG. 3 is an example of a circuit diagram, in which a) is a light source control unit and b) is a light source control unit.
Is an operation check unit. E is a power supply, VR is a variable resistor for adjusting the amount of emitted light, 11 is a voltmeter, RE is an operation detection relay, SCR is a silicon controlled rectifier, and 14 is a smoke detector as a sensor.
The light source 6 such as a halogen lamp emits light when the power switch 8 is turned on, and the applied voltage to the light source 6 is changed by the variable resistor VR to increase the amount of emitted light, and at the same time, the applied voltage is displayed by the voltmeter 11. The light emitted from the light source 6 is received by a smoke detecting light-receiving element (not shown) of the sensor 4, and when the smoke detecting section 14 is activated by the received light output, the operation detecting relay RE operates to close its contact re. Then, the operation indicator lamp 12 is turned on.

FIG. 4 is a schematic sectional view of another embodiment of the test box.
A light receiving element 15 such as a PIN photodiode is provided in the test box 1 immediately before the wire mesh 5 of the photoelectric smoke detector 4 attached to the lid 2 thereof, and a flash light source 16 such as a xenon lamp is provided on the opposite side.
Place. The light receiving element 15 and the flash light source 16 are provided on support rails 18 and 19 movable on a rail 17 so as to be able to move up and down so that the light receiving element 15 and the flash light source 16 can be set at positions corresponding to the type of the sensor 4. In the case of this embodiment, the light receiving elements 15 and the flash light source 16 are provided on the left and right sides of the photoelectric smoke detector 4, so that the fixed positions of the various bases 3 are set so that the centers are aligned. Therefore, the positions of the light receiving element 15 and the flash light source 16 according to the type of the photoelectric smoke detector 4 can be designated in advance. The light receiving element 15 detects a small leak of light emitted by the smoke detecting light receiving element (not shown) in the sensor 4 to the outside of the sensor 4 and causes the flash light source 16 to emit light simultaneously with the light emission of the smoke detecting light receiving element. . Here the light receiving element 15
Detects light leakage outside the detector due to light emission of the smoke detecting light-receiving element. An optical fiber passing through the wire mesh 5 is provided on the light-receiving element 15, and this optical fiber is passed through the wire mesh 5 to a dark box (not shown). It is also possible to directly detect the light emission of the light detecting element for smoke detection by inserting the light emitting element into the inside. Further, it is also possible to detect an electromagnetic wave generated by a large current flowing when the smoke detecting light receiving element emits light.In this case, an antenna element is arranged instead of the light receiving element 15 and when the electromagnetic wave of the antenna element is detected. What is necessary is just to make the flash light source 16 emit light.

FIG. 5 is a circuit diagram of one embodiment of FIG. 4, and the operation check section is the same as b) of FIG. C ₁ and C ₂ are capacitors, REC is a rectifier circuit, T ₁ is a step-up transformer, T ₂ is a transformer for generating a trigger signal, VR is a variable resistor for adjusting the charging voltage, MM ₁ and MM ₂ are monostable multivibrators , NOT is an inverter, and 20 is a light emission detection circuit to which the light receiving element 15 is connected. Flash source 16 such as a xenon lamp emits at a discharge current of the charging capacitor C ₁ to charge voltage by the variable resistor VR is established, the emission is output from the light emission detection circuit 20 by the light-receiving output of the light receiving element 15 Trigger signal is emitted. Furthermore, during light emission of the flash source 16, the output of the monostable multivibrator MM ₂ which is operated by the trigger signal,
This prevents the light emission detection circuit 20 from generating a light emission output. If the sensor has an output terminal for a light emission synchronization signal, the synchronization signal output from this output terminal may be used as a trigger signal for the flash light source.

〔The invention's effect〕

The sensitivity tester according to the present invention performs a sensitivity test by irradiating a photoelectric smoke sensor with light and operating the photoelectric smoke detector. And check the sensitivity. Also, since a special function is not required for the sensor, a sensitivity test can be performed as it is for a conventional sensor.

[Brief description of the drawings]

The drawings show an embodiment of the present invention. FIG. 1 is a schematic sectional view of a test box of one embodiment, FIG. 2 is an operation display section of the test box of FIG. 1, and FIG. FIG. 4 is an example of a circuit diagram of FIG. 1, FIG. 4 is a schematic sectional view of a test box of another embodiment, and FIG.
It is an example of the circuit diagram of the figure. 1 ... test box, 2 ... lid, 4 ... photoelectric smoke detector, 6,16
…… Light source, 15… Light receiving element, 20 …… Emission detection circuit, VR…
... variable resistor, C ₁ ... charging capacitor, T ₂ ... trigger signal generating transformer.

Claims (3)

(57) [Claims] 1. A sensitivity tester for a photoelectric smoke sensor, comprising: a light source unit for emitting light to the photoelectric smoke sensor; and a control unit for variably controlling a light emission amount of the light source unit. A light-emitting sensitivity tester for a photoelectric smoke detector, characterized in that: 2. A control unit comprising: a light receiving element for detecting light emission or an electromagnetic wave of a smoke detecting light emitting element of a photoelectric smoke detector; or an electromagnetic wave detecting element; and a detection output of the light receiving element or the electromagnetic wave detecting element. The light-emitting sensitivity tester for a photoelectric smoke detector according to claim 1, further comprising light-emitting means for causing the light source unit to emit light. 3. The photoelectric smoke detector has an external terminal for outputting a synchronization signal when the light emitting element for smoke detection emits light, and the control unit includes: an input terminal for a synchronization signal connected to the external terminal;
2. A light-emitting sensitivity tester for a photoelectric smoke sensor according to claim 1, further comprising light-emitting means for causing said light source section to emit light in response to a synchronization signal input to said input terminal.