JPH04326199A - Test device for fire alarm - Google Patents

Abstract

PURPOSE:To operate the operative and inoperative test of plural ON/OFF type fire sensors at a fire receiver side, as for a fire alarm in which the plural ON/ OFF type fire sensors are connected with a sensor line. CONSTITUTION:Plural fire sensors 2 equipped with test terminals which are operated by the impression of simulated test voltages are connected with a sensor line L and a test line T, and a characteristic signal generator 3 provided corresponding to the plural fire sensors 2, which generates a characteristic signal at the time of operation, is installed. The fire receiver 1 is equipped with a test voltage generating means which generates an operative test voltage and an inoperative test voltage in order to operate the operative test and the inoperative test by impressing the test voltages through the test line T to the test terminals of the entire fire sensors 2, and also a display device which identifies and displays the fire sensor 2 which is operated from the characteristic signal of the sensor line L, is installed, so that the operative and inoperative test of the plural fire sensors 2 can be operated at one time.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a test device for fire alarm systems, and more particularly to a test device capable of testing the operation and non-operation of a plurality of fire detectors.

0002

2. Description of the Related Art Fire detectors used in fire alarm systems are of the on-off type. In this on-off type fire detector, when a predetermined temperature, smoke concentration, etc. are detected, conduction is established between a pair of power and signal detector lines extending from the receiver with low impedance. A receiver detects the operation of the sensor based on the current (voltage) in the line and issues a fire alarm. Therefore, fire detectors are adjusted to operate at a predetermined sensitivity. This is a test voltage equivalent to a predetermined detection voltage (current), and it is confirmed that it does not work at level 1, and it is confirmed that it always works at level 2, which exceeds level 1. It is confirmed that the sensitivity is within a predetermined range. For example, a test method for an operation test and a non-operation test is shown in Japanese Utility Model Application Publication No. 59-147289 entitled "Testing Device for Ionization Smoke Detector".

[0003] However, although such testing equipment can perform tests relatively easily during the manufacturing stage of fire detectors, once installed at the site, it is necessary to remove and test the fire detectors one by one, which is time-consuming. The disadvantage is that it takes time.

0004

[Problem to be solved by the invention] The problem to be solved is to perform an operation test and a non-operation test of the fire detector in a single hour while the on-off type fire detector installed at the site is connected. The problem is that it is impossible to find a fire detector with poor sensitivity.

[0005]

[Means for Solving the Problems] A test device for a fire alarm system of the present invention includes a fire receiver for monitoring and issuing an alarm, a pair of detector lines extending from the fire receiver, and a fire alarm system for detecting heat, smoke, etc. A plurality of fire detectors are equipped with test terminals that operate when the detection level of a fire phenomenon exceeds a predetermined value, conduct with low impedance, and test the operating sensitivity with an externally applied test voltage; A plurality of unique signal generators are provided corresponding to the fire detectors and transmit unique signals to the detector lines in conjunction with the operation of the fire detectors, and the fire receiver includes a normal fire detector. a test voltage generating means for generating an operational test voltage for operation and a non-operation test voltage for non-operation; and a motion sensor identifier for identifying a characteristic signal sent from the characteristic signal generator to the sensor line. and applying a test voltage from the test voltage generating means to the test terminal of each of the plurality of fire detectors via a test line to perform a sensitivity test of the fire detector. It is something.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A test apparatus for a fire alarm system according to the present invention will be explained in detail below with reference to the drawings. FIG. 1 is an overall block diagram showing an embodiment of a test device for a fire alarm device according to the present invention. This fire alarm system includes a fire receiver 1 that monitors and issues a fire alarm, a pair of sensor lines L and C extending from the fire receiver 1 to a warning area, a test line T, this sensor line L, and a plurality of fire detectors 2 connected in parallel to the test line T, and a plurality of unique signal generators 3 connected in correspondence with the plurality of fire detectors 2, respectively.

[0007] The operation of this test device for a fire alarm system constructed as described above will be explained. A test voltage from the fire receiver 1 is supplied to the test terminal of each fire detector 2 via the test line T. If the test voltage is a non-operation test voltage, the fire detector 2 will not operate if all the fire detectors 2 have normal sensitivity. If the sensor operates in this test, the corresponding characteristic signal generator 3 operates and sends a signal of a characteristic frequency to the sensor lines L and C. The fire receiver 1 detects the signal of this natural frequency, identifies and displays the activated fire detector 2. That is, it is possible to know which fire detector 2 has become defective (highly sensitive). In addition, if the test voltage is the operating test voltage, all fire detectors 2 should operate, but if there is a fire detector 2 that does not operate, the sensitivity of this fire detector 2 is poor (
It can be determined that the sensitivity is low.

In this way, the upper limit test voltage at which a normal fire detector 2 must not operate in the non-operation test and the lower limit test voltage at which a normal fire detector 2 must operate in the operation test are determined. After two tests, the sensor line L,
It is possible to identify and display poor sensitivity of all fire detectors connected to C.

FIG. 2 is a block circuit diagram showing an embodiment of the fire receiver 1 shown in FIG. Power supply E1, resistors R1, R2, transistor Q1, relay R
A sensor operation detection circuit consisting of L, an alarm indicator 13 that is driven by the normally open contact RM of the relay RL and displays a fire alarm, and a capacitor CP that transmits the natural frequency signal when the fire detector 2 of the sensor line C is operating. an amplifier 12 that adjusts the signal to a predetermined level through the amplifier 12, a unique signal identification circuit 11 that identifies the signal of the natural frequency from the amplifier 12 using a band-pass filter, etc., and a fire detection circuit operated by the signal from the unique signal identification circuit 11. 2, test voltage power supplies E2 and E3 for supplying operating and non-operating test voltages to the test line T, and a test switch 14 for switching between operating and non-operating test voltages. There is.

FIG. 3 is a block circuit diagram showing an embodiment of the fire detector 2 and the unique signal generator 3 of FIG. 1, and the fire detector 2 is an ion type smoke detector as an example. This fire detector 2 includes an internal ion chamber 21, an external ion chamber 22 into which outside air enters, an internal ion chamber 21, and an external ion chamber 2.
It is composed of a field effect transistor FT that performs impedance conversion of two intermediate electrodes, resistors R3 and R4, a Zener diode ZD, and a thyristor SR. Further, the characteristic signal generator 3 includes resistors R5 and R6, a transistor Q2, a constant voltage circuit 31, and an oscillation circuit 32 that receives a stable power supply from the constant voltage circuit 31 and generates a signal of a characteristic frequency. It consists of

The operations of the fire detector 2, unique signal generator 3, and fire receiver 1 configured as described above will be explained. The fire detector 2 connects the power from the fire receiver 1 to the detector line L.
, C and a resistor R5 of the unique signal generator 3, a power supply of a predetermined voltage is supplied. When smoke enters the external ion chamber 22 when a fire occurs, the gate potential of the field effect transistor FT rises, and a current flows between the source and drain of the resistor R4.
A voltage drop occurs between the two. When this voltage exceeds the Zener voltage of the Zener diode ZD, a current flows through the gate of the thyristor SR, making the thyristor SR conductive and in an operating state. The sensitivity is determined by the resistance value of the resistor R4 and the Zener voltage of the Zener diode ZD, and is set to operate at a predetermined smoke density. Also, the external ion chamber 22
and the fire receiver 1 via the test line T to the connection point of the resistor R3.
When a test voltage is applied, the potential of the intermediate electrode (gate electrode) rises and becomes the same state as when smoke is detected. A sensitivity test can be performed using a test voltage based on the relationship between the smoke density measured in advance and the potential of the intermediate electrode.

[0012] The fire detector 2 normally has a high impedance and the monitoring current is extremely small. Therefore, almost no voltage is generated across the resistor R5 of the characteristic signal generator 3. In this state, no power is supplied to the oscillation circuit 32, so no unique signal is generated. When the fire detector 2 operates and becomes conductive with low impedance, a voltage drop occurs across the resistor R5 and the constant voltage circuit 3
1 becomes active, and the oscillation circuit 32 becomes active. The natural frequency signal from this oscillation circuit 32 is transmitted through the transistor Q2.
The signal is amplified by the resistor R6 and output to the sensor lines L and C via the resistor R6.

On the other hand, in the fire receiver 1, when the fire detector 2 is activated, conduction occurs between the detector lines L and C at a predetermined impedance, so a current flows through the resistor R1 and the base/emitter of the transistor Q1. Becomes conductive. Therefore, the relay RL connected to the collector of the transistor Q1 becomes energized, closes its normally open contact RM, and the relay RL self-holds. And alarm display 13
A fire alarm is issued by driving the (fire indicator light, main sound system). At this time, the characteristic signal from the sensor line C is received by the amplifier 12 via the capacitor CP and made to a predetermined level. The signal from the amplifier 12 is identified by the unique signal identification circuit 11, and the display device 10 can display which fire detector 10 is activated.

[0014] When performing a non-operation test of the fire detector 2, the test switch 14 is switched to connect it to the power source E3. A test voltage from a power source E3 is supplied to the test line T to all of the fire detectors 2 connected to the sensor lines L and C, and the test is performed simultaneously. At this point, the activated fire detector 2 becomes defective, and this fire detector 2 can be known from the display state of the display device 10. When performing an operation test, the test switch 14 is switched to connect to the power source E2. In this case, the inoperative fire detector 2 becomes defective, which can be similarly identified from the display state of the display device 10. Fire detectors are not limited to ion type smoke detectors, but can also include thermal fire detectors, optical smoke detectors, etc. that detect the temperature and smoke concentration of fire phenomena and operate when the level of the detection signal exceeds a predetermined level. Needless to say, it can be used.

[0015]

[Effects of the Invention] As explained above, the fire alarm system testing device of the present invention can perform the activation/deactivation test of multiple on/off type fire detectors installed at the site without removing them one by one. Since fire detectors with poor sensitivity can be detected through testing, maintenance and inspection work on fire alarm systems becomes extremely easy.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of a fire alarm device testing device of the present invention.

FIG. 2 is a block circuit diagram showing an embodiment of the fire receiver of FIG. 1;

[Figure 3] A block circuit diagram showing an embodiment of the fire detector and unique signal generator in Figure 1.

[Explanation of symbols]

1 Fire receiver 2 Fire detector 3. Unique signal generator 10 Display device 11 Unique signal identification circuit 12 Amplifier 13 Alarm indicator 14 Test switch 21 Internal ion chamber 22 External ion chamber 31 Constant voltage circuit 32 Oscillation circuit L Sensor line C Sensor line T Test track RL Relay RM relay normally open contact CP capacitor FT field effect transistor ZD Zener diode SR Thyristor Q1 Transistor Q2 Transistor E1 to E3 Power supply R1 to R6 Resistance

Claims (1)

[Claims] Claim 1: A fire receiver that monitors and issues fire alarms, a pair of detector lines extending from the fire receiver, and a heat detector.
A plurality of fire detectors are equipped with test terminals that operate when the detection level of fire phenomena such as smoke exceeds a predetermined value, conduct with low impedance, and test operating sensitivity with an externally applied test voltage; A plurality of unique signal generators are provided corresponding to the plurality of fire detectors and transmit unique signals to the detector line in conjunction with the operation of the fire detector, and a normal signal generator is provided in the fire receiver. If it is a fire detector, a test voltage generating means that generates an operating test voltage that operates and an inoperable test voltage that should not operate, and an operation that identifies a specific signal sent from the specific signal generator to the sensor line. and a detector identification means, for performing a sensitivity test of the fire detector by applying a test voltage from the test voltage generating means to the test terminal of each of the plurality of fire detectors via the test line. Features: Test equipment for fire alarm systems.