EP2711907B1 - Detector, test device and method for testing a detector - Google Patents

Description

[Technical area]

The invention relates to a hazard detector for the detection of interfering medium such as gas, smoke or temperature, a method for testing this detector and a test device with which the detector can be checked.

[State of the art]

Such a method, a detector and a tester are for example from EP 1 286 320 B1 known. In the described method, a test signal is generated for testing the detector, which is composed of a sequence of high and low concentrations of a test medium and is different from a Störmedium-concentration pattern that occurs in an alarm case. The tester generates the described test pattern and the detector recognizes the test pattern output by the tester as such and outputs an alarm signal.

It has been shown that the method is well suited is to test a smoke detector with a commercially available test aerosol from a spray can or spray bottle. When delivering a short spray of such Prüfaerosols from the spray can in the detection range of the detector, the sensor of the detector reacts with a high measurement signal. After delivery of the short spray jet, the test aerosol decomposes rapidly, whereupon the sensor reacts with a low measurement signal. Therefore, alone with a test aerosol from a spray can in a short time a certain sequence of high and low concentrations of Prüfaerosols be generated.

However, instead of a smoke sensor, a gas sensor z. B. a CO sensor are checked, then a test gas must be used as the test medium instead of an aerosol. However, a common test gas lacks the property to expire within a short time and lingers longer time in the detector. Therefore, it is necessary to wait a long time with a test gas until a low concentration and thus a low measuring signal at the sensor again sets. Since the residence time of the gas in the detector is indefinite, it becomes impossible to produce a precisely determined sequence of high and low test medium concentrations. In any case, at least the time required to generate a sequence of high and low test medium concentrations is increased. The advantage of a considerably accelerated inspection of the detector is thereby significantly reduced or even lost altogether. This is the case even if the test medium used consists of a spray aerosol that already contains a test gas, as z. B. from the US 4715985 A has become known. Since the test aerosol decomposes, but the test gas contained therein does not, the test gas remains in the detection range of the gas sensor and continues to generate a high measurement signal there.

OBJECT OF THE INVENTION

The invention is therefore based on the object to shorten the time required for the test of a detector according to the method described above.

DESCRIPTION OF THE INVENTION

The object is achieved according to the preamble and the characterizing features of claims 1, 6 and 8 and will be described in more detail below. Advantageous developments can be found in the subclaims.

With the method according to the invention for testing a hazard detector for detecting interfering medium such as gas, smoke or temperature, a detector is tested which has at least one first sensor for measuring a first interfering medium. Under interference medium basically every substance and every physical size is understood, which generates a measurement signal to a suitable sensor. In the detector, the measurement signal of the first sensor is subjected to a first filter operation for detecting at least one noise medium alarm pattern that occurs in the event of an alarm. Filter operation is understood to be any measure that is used to detect a specific event, such as the event of a fire. In particular, this also means the execution of algorithms for the recognition of specific patterns. As an alarm case, the detection of a danger such. B. understood as a fire or a harmful concentration of a toxic gas. If the detector detects an interference medium alarm pattern in the first filter, the detector emits an alarm signal.

In order to test the functionality of the detector, a specific sequence of high and low concentrations or intensities of a first test medium is output as a test pattern in the detection region of the at least one first sensor. This is under test medium, a substance z. As a gas, a mixture of different substances, an aerosol or a measurable physical quantity, for. As a temperature understood, which is introduced into the sensor-active area (detection range) of a sensor to cause a change in the previously supplied by the sensor reading, wherein the substances or physical quantities that are used as the test medium, with the monitored Sturgeon media can be identical, but can also differ from it, if they cause a corresponding measurable response to the respective sensor. As the first sensors find in the detector z. B. gas sensors such as CO sensors, smoke sensors and temperature sensors use. In order for the test pattern to be used to detect a detector test, it differs from all patterns with which an alarm case can be detected, that is to say from all interference medium alarm patterns that are reasonably expected to occur in the event of an alarm.

In addition to the first filtering operation, the measuring signal of the first sensor is subjected to a second filtering operation for detecting the test pattern occurring in the test. Upon detection of this test pattern, the alarmer issues an alarm signal and / or a positive test confirmation signal. To generate the test pattern from the specific sequence of high and low concentrations or intensities of the first test medium, a second test medium is dispensed after a dispensing of the first test medium, which displaces the first test medium. This has the consequence that a high concentration or intensity of the first test medium is reduced quickly and after a precisely definable time, and quickly sets a low reading on the first sensor. This is not only the case when a test gas is used as the test medium, but also when a spray aerosol is used, as well as the spray aerosol can be displaced faster than it decays. Thus, faster and more accurate test patterns can be generated even when using a Prüfaerosols as test medium.

The second test medium used is preferably a medium which does not generate a measurement signal at the first sensor. For this purpose, depending on the configuration of the first sensor z. As air, hot air, nitrogen, combustion gases such as CO or a test aerosol suitable and are used accordingly.

If a gas sensor, in particular a CO sensor, is used as the first sensor, air, hot air, nitrogen and particularly preferably a smoke test aerosol are preferably used as the second test medium. However, if a smoke sensor is used as the first sensor, preferably air, hot air, nitrogen and particularly preferably fire gases, in particular CO, are used as the second test medium.

With the method according to the invention test patterns can be generated, which can be distinguished particularly well from alarm patterns, when in addition to the first sensor, a second sensor is used, which is sensitive to a different interference medium than the first sensor.

Therefore, in an advantageous further development of the method according to the invention, the first sensor is sensitive to the first test medium but not to the second test medium and a second sensor is sensitive to the second test medium. Preferably, the second sensor is not sensitive to the first test medium.

Are z. B. as a first sensor, a CO sensor and second sensor uses a smoke sensor, then a simple test pattern z. For example, when delivering a short burst of CO as the first test medium, the measurement signal of the first sensor increases while the measurement signal on the second sensor remains unchanged. During the subsequent delivery of a short burst of a spray aerosol as a second test medium, the first test medium is displaced by the second test medium, the measurement signal at the first sensor decreases, while at the same time the measurement signal at the second sensor increases.

A further development of the method according to the invention results from the use of a third sensor, which is sensitive to a third interfering medium, in particular to temperature. This is particularly advantageous if both the second sensor and the third sensor are sensitive to the second test medium, which z. B. is the case when the second sensor is a smoke sensor, the third sensor is a temperature sensor and the second test medium, a spray aerosol is used. The spray aerosol cools down the temperature sensor, which responds to it with a decreasing reading, while at the same time the measurement signal of the smoke sensor rises sharply.

The invention also relates to a detector for the detection of interfering medium such as gas, smoke or temperature, with at least a first sensor for measuring a first interfering medium, in particular a gas such as CO and for measuring a first test medium, in particular a test gas. The detector comprises an evaluation device, which comprises a first filter device for detecting an occurring in the event of an alarm Has interference medium alarm pattern. The evaluation device has, in addition to the first filter device, a second filter device which is designed to detect a test pattern from a sequence of high and low test medium concentrations or intensities, wherein the test pattern deviates from interference medium alarm patterns which correspond to a Alarm case may occur and wherein the test pattern is provided for the test of the functionality of the detector. The detector also has a signal output device which emits an alarm signal when the first filter device detects a noise medium alarm pattern and then outputs an alarm signal and / or a signal for confirming the passed test after having recognized a test pattern by the second filter device has been.

The detector preferably also contains, in addition to the first sensor, a second sensor which is sensitive to a second interfering medium, in particular smoke, and a second test medium, in particular an aerosol. The first sensor of the detector is sensitive to the first test medium, but not the second test medium and the second filter device is adapted to detect a test pattern of the type described above, in which a low concentration or intensity of the first test medium with a high concentration or Intensity of the second test medium is accompanied and preferably also a high concentration or intensity of the first test medium with a low concentration or intensity of the second test medium is accompanied.

However, a detector is particularly preferred in which the second filter is set up to recognize a test pattern in which high concentrations or intensities of the first test medium alternate with high concentrations or intensities of the second test medium.

Another particularly preferred detector according to the invention comprises a third sensor, which is designed as a temperature sensor. The first sensor is here a gas sensor and the second sensor is a smoke sensor. In this detector, the second filter is set up to recognize a test pattern in which a low concentration of the first test medium is measured at a high concentration of the first test medium, simultaneously with the low concentration of the first test medium, a high concentration of the second test medium is accompanied and with the high concentration of the second test medium, the measured value of the second sensor rises sharply and the measured value of the third sensor drops sharply.

The invention also relates to a test device with which a correspondingly arranged detector can be checked by the method according to the invention. The test device according to the invention for testing a detector for the detection of interfering medium, such as gas or smoke, contains a dispensing device for a first and a second test medium having an adjusting device for adjusting the discharge amount of the first and second test medium.

The dispenser is connected to a control device. The controller controls adjustment of a predetermined sequence of high and low concentrations or intensities of the first and second test media dispensed as a test pattern from the dispenser. This test pattern deviates from an interference medium alarm pattern, which can occur in the event of an alarm. Furthermore, the dispensing device has at least one first dispensing opening from which emerges a jet or a surge of the first and / or the second test medium. This discharge opening is aligned in the delivery of the second test medium so that the first Test medium is displaced from the detection range of the first sensor.

Preferably, a second dispensing opening is provided in the dispensing device of the test device in addition to the first dispensing opening. When the first test medium is dispensed, the second dispensing opening is aligned with a first sensor such that the first test medium enters the detection area of the first sensor. In addition, during the delivery of the second test medium, the first dispensing opening is also aligned with the second and preferably also with a third sensor such that the second test medium enters the detection area of the second sensor and preferably also into the detection area of the third sensor.

In a preferred test device, the dispensing device has at least one storage container for the first test medium, in particular a test gas, and a second storage container for the second test medium, in particular a test aerosol. The storage containers are each connected via a valve to a first and / or second discharge opening for the first and / or second test medium. In addition, the valves are in drive connection with at least one actuator, which is connected to set the predetermined test pattern with a control device.

A particularly preferred embodiment of the test device additionally has a test pot which is provided with closable ventilation slots and which surrounds the detector to be tested and into which the first and / or second discharge openings protrude. Moreover, the control device is adapted to keep the ventilation slots open during the delivery of the second test medium until the first test medium has escaped from the test head and the ventilation slots then close, wherein preferably the ventilation slots are also opened to allow the second test medium to escape.

[Brief Description of the Drawings]

Fig. 1

shows a block diagram of a fire detector, which has a first, second and third sensor for the detection of combustion gas, smoke and / or temperature.

Fig. 2

shows a graphical representation of the unfiltered measuring signals of a CO, a smoke and a temperature sensor, during an incipient fire, wherein the abscissa represents the time and the ordinate the amplitude of the measuring signal is plotted.

Fig. 3

a graphical representation of the measuring signals, the sensors when testing the detector and the control signals of a second filter, which serves to detect a test pattern, wherein the abscissa represents the time and the ordinate, the amplitude of the measuring signal.

Fig. 4

shows a test device for testing a detector.

Fig. 5

shows variation in the Fig. 4 shown test device.

[Description of the Embodiments]

In the following the invention will now be explained in more detail with reference to the drawings. An in Fig. 1 In the whole with 1 designated detector for reporting an incipient fire has a first sensor 2a for the detection of combustion gas, in particular of CO, as a first interference medium, which arises in a fire. As the first sensor can here z. For example, an electrochemical cell or a semiconductor gas sensor can be used. In the sensor area 2 of the detector 1 is located next to the first sensor 2a, an optical smoke sensor 2b for detecting the second interfering medium smoke. The optical smoke sensor 2b comprises, in a manner known per se, an optical transmitter 3 and an optical receiver 4 for detecting the optical radiation emitted by the transmitter 3, wherein an optical measuring path 5, shown only schematically in the drawing, is formed between the transmitter 3 and the receiver 4 is. This is arranged in a measuring chamber which has inlet openings through which interference medium located in the sensor area 2 of the detector 1 can enter the measuring chamber. Finally, in the sensor area 2 of the detector 1, a third sensor 2c for detecting the third interfering medium temperature.

The sensors 2a, 2b, 2c each have a measuring signal output 6a, 6b, 6c to which a respective measuring signal 7a, 7b, 7c is applied, which is dependent on the concentration or intensity of the respective interfering medium in or on the sensors 2a, 2b, 2c. The measuring signal outputs 6a, 6b, 6c are connected via a multiplexing measuring amplifier 8 to the input of an evaluation device 9 which has a first filter 10a and a second filter 10b whose inputs are each connected to the output of the multiplexing measuring amplifier 8. The first filter 10a is for detecting an incipient fire (Alarm case) occurring Störmedium-concentration pattern (interference medium alarm pattern) set and the second filter 10b for detecting a test pattern, which differs from the disturbance medium concentration pattern occurring in the incipient fire and provided for testing the functionality of the detector 1. The concentration pattern provided for testing the functionality of the detector 1 has a shorter time duration than the interference medium concentration pattern occurring in the event of an alarm.

In Fig.1 It can be seen that the filter output 11a of the first filter 10a is connected to a first input of a signal output device 12 and the filter output 11b of the second filter 10b is connected to a second input of the signal output device 12. The output of this signal output device 12 is connected to a signal output 13 of the evaluation device 9, which is connected for forwarding an alarm or a signal to confirm a positive test to a leading to a fire alarm center detector line. The fire alarm unit, not shown, has optical and / or acoustic display means which are activated when an alarm occurs or display a positive result of a test and possibly also a negative result if an expected positive result is absent.

In Fig.2 For example, the measurement signals 7a, 7b, 7c of the first 2a, second 2b and third 2c sensors are graphically represented in the course of an exemplary incipient fire. The time is plotted on the abscissa, with the beginning of the conflagration corresponding to the time of one hundred. It can clearly be seen that the signal level of the measurement signals 7a, 7b, 7c, 7c, 7c, 7c, 7c, 7c, 7c, 7c, 7c, 7c, 7c, 7c, 7c, 7c, 7c, 7c, 7c, 7c, 7c, 7c, 7c, 7c, 7c, 7c at the beginning of the incipient fire is still very low and then different rise quickly.

An exemplary noise media alarm pattern that can be recognized as a fire among other patterns in the first filter 10a is approximately as follows. When the measurement signal 7a of the first sensor 2a reaches 40, the measurement signal 7b of the second sensor 2b becomes the value 60 has exceeded for at least 20 time units and the measuring signal 7c of the third sensor 2c has been increasing for at least 30 seconds and has reached a value 60. For this noise media alarm pattern, the first filter has detected an alarm at the latest at time 300. Upon detection of this or another noise media alarm pattern, a filter output present at the filter output 11a of the first filter 10a is set. A pending at the signal output 13 alarm signal is then also set, or active.

To test the functionality of the detector 1 is in the detection range of the first sensor 2a manually from a spray can or by means of a test device 18 to be described in more detail below, a first test medium z. B. CO or H ₂ delivered. This results in the first sensor 2a, a CO sensor, an abruptly rising and high measurement signal 7a.

In Figure 3 the measurement signal 7a is shown graphically during the testing of the detector 1. The time is plotted on the abscissa, wherein the delivery of a first test medium pulse is started in the time marked with the number "2". The steep rise and the high measured value 7a are clearly visible. After a precisely predetermined time for the test signal to be generated is in Fig. 3 at time "4" a second test medium, z. As a spray aerosol discharged into the detection area of the first sensor 2a, whereby the first test medium is displaced from the detection area and its concentration is abruptly lowered as it has risen. By repeating this sequence at fixed time intervals, an exact sequence of high and low concentrations or intensities of the first test medium is produced, which is detected by the first sensor 2a as the measurement signal 7a. As soon as the abrupt rise and extremely high measured value 7a of the first sensor 2a are detected, a first control signal 20 is set in the second filter 10b, in FIG Fig. 3 to recognize at time "3". A second control signal 21 is set if, at time "4", the suddenly occurring low measured value 7a is detected. A third control signal 22 is set at time "7" when a renewed suddenly occurring high reading 7a is measured at that time. Already at this time, it is recognized that a test pattern is present and the sensor under test is functioning. Therefore, a test pass signal 16b is outputted at time "7" at the output 11b of the second filter 10b.

In a further improved embodiment, the detector 1, as in Fig. 1 shown, a second sensor 2b, which is designed as a smoke sensor. Both sensors 2a, 2b are arranged to one another such that the second test medium penetrates into the detection area of the second sensor 2b and displaces the first test medium from the detection area of the first sensor 2a. If in the detector, as in Fig. 1 shown, a second sensor 2b is present, and this is a smoke sensor, then by issuing the second test medium, a spray aerosol, at time "4" at the second sensor simultaneously with the decrease of the measurement signal 7a of the first sensor 2a, a high measurement signal 7b. When the first control signal 20 is set and the very high measured value 7b abruptly occurring at the time "4" is detected at the second sensor 2b is set, a fourth control signal 23 is set at time "5". In this case, since three control signals have already been set at the time "5", it could already be detected at this time that a test pattern is present and the sensors 2 a, 2 b checked are functioning. Therefore, at the latest at time "7", but possibly even at time "5", at the output 11 b of the second filter 10b a "passed test" signal 16b is output.

In a further improved embodiment, the detector 1, as in Fig. 1 shown, a third sensor 2 c, which is designed as a temperature sensor. All three sensors 2a, 2b, 2c are arranged to one another such that the second test medium penetrates into the detection area of the second sensor 2b, displaces the first test medium from the detection area of the first sensor 2a and additionally strikes the third sensor 2c. When the second test medium spray aerosol escapes from the bottle, it cools down by expansion. When the aerosol impinges on the third sensor 2c, it is also cooled and further cooled by the subsequent evaporation of the aerosol which has hit the third sensor 2c. The cooling of the third sensor 2c leads to a sinking measurement signal 7c at the third sensor 2c. This is in Fig. 3 shown approximately. Thereafter, the third sensor heats up again, resulting in a rising measurement signal 7c again. This too is in Fig. 3 approximately indicated.

This cooling and heating effect is commonly known in the art, and has been used for decades for testing temperature sensors in hazard detectors and also used here in this sense. At the time point "5", a measured value 7c, which is significantly reduced in comparison to the preceding measured values 7c, is then measured when the control signal 20 is set, and as a result, a fifth control signal 24 is set. Thus, in the in Fig. 3 Example shown at time "5" already set four control signals. Since it is ruled out that a very short CO concentration, a very high smoke concentration and a rapidly decreasing temperature occur at the same time in a fire of emergence shortly after a very high CO concentration, in this example already at the time "5" at the exit 11 b of the second filter 10b, a "passed test" signal 16b is output, which indicates the operability of all three sensors 2a, 2b, 2c of the detector 1.

In order to be even more certain that a test pattern is present, it is still possible to wait until the third control signal 22 is set as well, and then the test pass signal is output only at the time "7" when all five control signals 20, 21, 22, 23, 24 are set. So that only all control signals can be set simultaneously when a predetermined test pattern occurs, all control signals are reset after a predetermined period of time, which happens in the example for all control signals 20, 21, 22, 23, 24 simultaneously at time "11".

The test media can be dispensed, for example, by means of two spray bottles by hand according to the test concentration pattern. Preferably, however, the delivery of the test media is carried out by means of a in the 4 and 5 This has a storage container 19a for the first test medium and a storage container 19b for the second test medium in which they are stored under pressure. The storage container 19a, 19b are each connected via a respective valve not shown in detail in the drawing, each having a discharge opening 25a, 25b for the first and second test medium. The valves are each with an actuator in Drive connection, which may for example have an adjustable by an electromagnet against a restoring force anchor. The actuators are each connected to the control input of a control device 26, which is adapted to control the valves for generating the predetermined test pattern. The control device 26 is connected to an actuating element, which in the embodiments according to 4 and 5 is designed as an electrical button 27. Upon actuation of the button 27, the delivery of the first and second test medium is triggered with the predetermined test pattern.

In the in Fig. 4 In the embodiment shown, the storage containers 19a, 19b are inserted into a holder 28, which is connected to a rod 29. In this case, the discharge openings 25a, 25b are aligned with each other such that when the first test medium is dispensed, the first test medium enters the detection area of the first sensor 2a, and when the second test medium is dispensed, the second test medium likewise enters the detection area of the first sensor 2a, in order to displace the first test medium therefrom, and in addition to reach the second test medium also in the detection area of the second sensor 2b and also to let the third sensor 2c meet. A second button 27 is attached to the lower end of the rod 29, so that even when using a long rod, the delivery of the test pattern can be conveniently triggered from the lower end of the rod 29 from.

In the Fig. 5 shown embodiment of the test device differs from the in Fig. 4 shown in that in addition a test head 30 is provided, which can be placed over the detector 1. The discharge ports 25a, 25b are in this case via lines 32a and 32b with the storage containers 19a and 19b and are in the test pot 30 to each other aligned so that upon delivery of the first test medium, the first test medium enters the detection range of the first sensor 2a, and when the second test medium, the second test medium also enters the detection range of the first sensor 2a to displace the first test medium and in addition The second test medium can also enter the detection area of the second sensor 2b and also let it hit the third sensor 2c. Thus, the first and possibly also the second test medium can be easily displaced from the detector 1, the test head 30, the actual function is that the test medium is kept long in the detector 1, and thus only little test medium is needed, closable ventilation slots on, which are opened when the second test medium from the control unit 26. Through the opened ventilation slots 31, the first test medium can then escape from the test head 30. By using the test pot 30, the required amount of the first and second test media can be reduced even when using the method according to the invention.

Claims (11)

1. Method for testing a hazard detector (1) for detecting disturbing medium such as gas, smoke or temperature, which detector (1) has at least one first sensor (2) for measuring a first disturbing medium, the measurement signal (7a) from the first sensor (2a) being subjected to a first filter operation to detect a disturbing-medium alarm pattern occurring in the event of an alarm and, when this disturbing-medium alarm pattern is detected, an alarm signal being output, a specific sequence of high and low concentrations or intensities of a first test medium which differs from the disturbing-medium alarm pattern being discharged as a test pattern in order to test the serviceability of the detector (1) in the detection range of the at least one first sensor (2a), and the measurement signal from the first sensor (2a) being subjected to a second filter operation in addition to the first filter operation to detect the test pattern occurring during the test and, when this test pattern is detected, an alarm signal and/or a signal for confirming a positive test (16b) being output, characterized in that to generate the specific sequence of high and low concentrations or intensities of the first test medium, following a discharge of the first test medium a second test medium, which displaces the first test medium, is discharged.
2. Method for testing a hazard detector according to Claim 1, characterized in that the second test medium used is a medium which does not generate any measurement signal on the first sensor (2a), the second test medium used being in particular air, hot air, nitrogen, a gas of combustion such as CO or a test aerosol.
3. Method for testing a hazard detector according to Claim 1 or 2, characterized in that the first sensor (2a) used is a gas sensor, in particular a CO sensor, and the second test medium used is air, hot air, nitrogen or a smoke test aerosol, or in that the first sensor (2a) used is a smoke sensor and the second test medium used is air, hot air, nitrogen or a gas of combustion, in particular CO.
4. Method for testing a hazard detector according to one or more of Claims 1-3, characterized in that, in addition to the first sensor (2a), use is made of a second sensor (2b), which is sensitive to a different disturbing medium from the first sensor (2a), the first sensor (2a) is sensitive to the first test medium but not to the second test medium, and the second sensor (2b) that is sensitive to the second test medium is preferably not sensitive to the first test medium.
5. Method for testing a hazard detector according to Claim 4, characterized in that use is made of a third sensor (2c), which is sensitive to a third disturbing medium, in particular to temperature, and both the second sensor (2b) and the third sensor (2c) are sensitive to the second test medium, in particular a test aerosol from a spray can.
6. Detector (1) for detecting disturbing medium such as gas, smoke or temperature, having at least one first sensor (2a) for measuring a first disturbing medium, in particular a gas such as CO, and for measuring a first test medium, in particular a test gas, and having an evaluation device (9) which has a filtering device (10a) for detecting a disturbing-medium alarm pattern occurring in the event of an alarm, the evaluation device (9) having a second filtering device (10b) in addition to the first filtering device (10a), the second filtering device being designed to detect a test pattern for the test of the serviceability of the detector, comprising a sequence of high and low test medium concentrations or intensities, differing from the disturbing-medium alarm pattern occurring in the event of an alarm, and the detector (1) having a signal output device (13) which, after a test pattern has been detected by the second filtering device (10b), outputs an alarm signal and/or a signal for confirming the test (16b) that has been passed, characterized in that the detector (1) contains a second sensor (2b), which is sensitive to a second disturbing medium, in particular smoke, and a second test medium, in particular an aerosol, the first sensor (2a) is sensitive to the first test medium but not to the second test medium, and in that the second filtering device (10b) is equipped to detect a test pattern, in which a low concentration or intensity of the first test medium is accompanied by a high concentration or intensity of the second test medium.
7. Detector (1) according to Claim 6, characterized in the second filter (10a) is equipped to detect a test pattern in which high concentrations or intensities of the first test medium alternate with high concentrations or intensities of the second test medium.
8. Test device (18) for testing a detector (1) for detecting disturbing medium such as gas or smoke, according to Claim 6, having a discharge device for a first and a second test medium, which device has a setting device for setting the discharge quantity of the first and second test medium, characterized in that the discharge device is connected to a control device (26) for setting a predefined sequence of high and low concentrations or intensities of the first and second test medium as a test pattern, which sequence differs from a disturbing-medium alarm pattern occurring in the event of the alarm, and in that the discharge device has at least one first discharge opening (25a), from which a jet or a flood of the first and/or the second test medium emerges and which, during the discharge of the second test medium, is aligned such that the first test medium is displaced out of the detection range of the first sensor (2a).
9. Test device (18) according to Claim 8, characterized in that in addition to the first discharge opening (25a), a second discharge opening (25b) is provided, during the discharge of the first test medium the second discharge opening (25b) is aligned with a first sensor in such a way that the first test medium comes into the detection range of the first sensor (2a) and, during the discharge of the second test medium, the first discharge opening is aligned in the same way with the second and preferably also with a third sensor (2b, 2c) such that the second test medium comes into the detection range of the second sensor (2b) and preferably also into the detection range of the third sensor (2c).
10. Test device (18) according to Claim 9, characterized in that the discharge device has at least one storage container (19a) for the first test medium, in particular a test gas, and a second storage container (19b) for the second test medium, in particular a test aerosol, which are each connected via a valve to a first and/or second discharge opening (25a, 25b) for the first and/or second test medium, and in that the valves have a drive connection to at least one actuating drive which, in order to set the predefined test pattern, is connected to a control device (26).
11. Test device (18) according to Claim 10, characterized in the test device (18) has a test pot (30) provided with closable ventilation slots (31), which surrounds the detector (1) to be tested and into which the first and/or second discharge opening (25a, 25b) projects, and in that the control device (26) is equipped to keep the ventilation slots (31) open during the discharge of the second test medium until the first test medium has escaped from the test pot (30).

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