JP2006209800A - Test system, test method and sensor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a test system, a test method and a sensor, allowing reduction of a time required for a test of a tester even when requiring a time for a test of the sensor, especially allowing confirmation of whether or not the sensor normally operates even without performing the sensitivity test of the sensor. <P>SOLUTION: The sensor, e.g. 2-1 has: a dirt detection means 41 detecting a dirt amount of the sensor 2-1; and a return means returning the dirt amount detected by the dirt detection means 41 to the tester 1 by an instruction from the tester. When the tester 1 receives the dirt amount from the return means 42 of the sensor 2-1, the tester 1 displays the dirt amount. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a test system, a test method, and a sensor.

  Conventionally, a sensor (for example, a fire sensor) having a test function is known. FIG. 28 shows a system configuration in which this type of sensor 2-1 to 2-n is connected to the transmission line 3, and a tester 60 for testing each sensor 2-1 to 2-n is provided. It is a figure which shows an example. When testing this type of sensor 2-1 to 2 -n, conventionally, a predetermined test command (for example, a test start command) is sent from the tester 60 to the sensor, and the sensor receives the test command. The self-sensor was tested, and the test result was returned to the tester 60.

  However, a predetermined test command (for example, a test start command) is sent from the tester 60 to the sensor, and the sensor tests its own sensor by this test command, and returns the test result to the tester 60. In the above-described conventional method, if it takes time to test the sensor, the tester 60 must continue to wait for a long time until the test of the sensor is completed. There was a problem of requiring.

  An object of the present invention is to provide a test system, a test method, and a sensor capable of reducing the time required for testing in a tester even when the test of the sensor requires time. In particular, an object of the present invention is to provide a test system, a test method, and a sensor capable of confirming whether the sensor operates normally without performing a sensitivity test of the sensor.

  In order to achieve the above object, according to the first aspect of the present invention, there is provided a test system for testing a sensor, wherein the sensor detects a dirt by means of dirt detection means for detecting a dirt amount of the sensor and a command from the tester. Return means for returning the amount of dirt detected by the means to the tester, and the tester displays the amount of dirt when the amount of dirt is received from the return means of the sensor.

  According to a second aspect of the present invention, in the test system according to the first aspect, the sensor is provided with a sensitivity compensation means for compensating the sensitivity, and the dirt detection means is configured to detect the sensitivity of the sensitivity compensation means. The compensation amount is detected as a contamination amount.

  The invention according to claim 3 is the test system according to claim 1, wherein the sensor is a smoke sensor having a smoke detector, and the sensor includes the sensor at the time of manufacturing the sensor. Storage means for storing an output value from the smoke detection unit is provided, and the dirt detection unit compares the output value stored in the storage unit with the latest output value from the smoke detection unit. It is characterized by detecting the amount of dirt.

  The invention described in claim 4 is a test method for testing a sensor, the sensor detects the amount of dirt on the sensor, and returns the detected amount of dirt to the tester according to a command from the tester. When the amount of dirt returned from the sensor is received, the tester displays the amount of dirt.

  According to a fifth aspect of the present invention, there is provided a dirt detecting means for detecting the dirt amount of the sensor and a sensitivity compensating means for compensating the sensitivity, wherein the dirt detecting means determines the compensation amount of sensitivity in the sensitivity compensating means. It is a sensor characterized by being detected as the amount of dirt.

  According to a sixth aspect of the present invention, in the test system for testing a sensor, the sensor has a function of communicating with the tester, and the sensor is used to detect contamination of the sensor. Necessary information is sent to the tester, and the tester is characterized in that it detects dirt based on the information required for dirt detection sent from the sensor and displays the detected amount of dirt.

  According to the first to fifth aspects of the present invention, the sensor detects the amount of dirt on the sensor, and returns the detected amount of dirt to the tester according to a command from the tester. When the amount of dirt returned from is received, the amount of dirt is displayed, so that it is possible to confirm whether the sensor operates normally without performing a sensitivity test of the sensor. That is, the presence or absence of dirt can be detected without performing a sensitivity test.

According to a sixth aspect of the present invention, in the test system for testing a sensor, the sensor has a function of communicating with the tester, and the sensor is used to detect contamination of the sensor. Necessary information is sent to the tester, and the tester performs the dirt detection based on the information required for the dirt detection sent from the sensor and displays the detected amount of dirt. Without it, it can be confirmed that the sensor operates normally. That is, the presence or absence of dirt can be detected without performing a sensitivity test.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing a configuration example of a test system according to the present invention. Referring to FIG. 1, in this test system, sensors (for example, fire detectors) 2-1 to 2-n (n ≧ 1) are connected to a transmission line 3, and a test is performed on the transmission line 3. Device 1 is connected.

  FIG. 2 is a diagram showing a first specific example of the test system of FIG. Referring to FIG. 2, in this test system, sensors 2-1 to 2-n are connected to the transmission path 3 from the receiver 11. Here, the sensors 2-1 to 2-n are on / off type sensors having a communication function, and the transmission path 3 from the receiver 11 is an L or C line. That is, this test system is a P-type system, and sensors 2-1 to 2-n having communication functions are connected to the L and C lines, and the test shown in FIG. The device 1 has a function.

  In the example of FIG. 2, a terminator 18 is connected to the end of the L and C lines. In the example of FIG. 2, the receiver 11 is provided with power supply means 16, and power (voltage) from the power supply means 16 is supplied to the L and C lines.

  In the example of FIG. 2, the receiver 11 functions as a receiver in the monitoring control system (for example, disaster prevention system) (monitors the operating states of the sensors 2-1 to 2-n, and detects the sensors 2-1 to 2- n has a function of outputting an alarm or the like when an abnormality such as a fire is detected from n, and also has a function as a tester 1.

  FIG. 3 is a diagram showing a second specific example of the test system of FIG. Referring to FIG. 3, in this test system, in the system as shown in FIG. 2 in which sensors 2-1 to 2-n are connected to a transmission line 3 extending from the receiver 11, the receiver 11 and the sensor 2- Between 1 and 2-n, the tester 1 capable of communicating with the sensor is connected in parallel with the receiver 11. In the test system of FIG. 3, the tester 1 may be provided with power supply means 17.

  2 and 3, it is not necessary for all of the sensors 2-1 to 2-n to have a communication function with the receiver 11 or the tester 1, and some of them May not have a communication function with the receiver 11 or the tester 1. That is, a sensor having a transmission function (communication function) and a sensor having no transmission function (communication function) can be mixed in the same transmission path.

  Hereinafter, for convenience of explanation, it is assumed that each of the sensors 2-1 to 2-n has the same structure and has a communication function with the receiver 11 or the tester 1. .

  As described above, a predetermined test command (for example, a test start command) is transmitted from the tester 60 to the sensors 2-1 to 2-n, and the sensors 2-1 to 2-n In the conventional method of testing a sensor by itself and returning the test result to the tester 60, if the sensor test takes time, the tester waits for a long time until the sensor test is completed. There was a problem that had to continue.

  In order to solve such a problem, in the present invention, the tester 1 and the sensors 2-1 to 2-n are configured as shown in FIGS. That is, FIG. 4 is a diagram illustrating a configuration example of the tester 1 according to the present invention, and FIG. 7 is a diagram illustrating a configuration example of the sensor according to the present invention.

  Referring to FIG. 4, the tester 1 includes a test start unit (for example, a test key) 100 for starting a test and a plurality of sensors 2-1 to 2-n with a single operation of the test start unit 100. The test means 101 for performing the test and the test result display means 102 for individually displaying the test results from the sensors 2-1 to 2-n.

  More specifically, as the first embodiment, the test means 101 is configured so that when one operation is performed by the test start means 100 (for example, when the test key is operated once), each sensor 2- By sending a common test command to the transmission line 3 for 1 to 2-n, the sensors 2-1 to 2-n are collectively (simultaneously) tested, and each sensor The test results from 2-1 to 2-n can be received sequentially.

  Alternatively, as a second embodiment, the test means 101 is configured such that when one operation is performed by the test start means 100 (for example, when a test key is operated once), each of the sensors 2-1 to 2-2. For -n, a test command is sequentially sent to the transmission line 3 for each address of each sensor 2-1 to 2-n (for each sensor 2-1 to 2-n, each sensor The test commands are sequentially sent to the transmission line 3 in combination with the addresses (address search pulses as will be described later) of the devices 2-1 to 2-n). On the other hand, the test can be performed continuously (sequentially), and the test results from the sensors 2-1 to 2-n can be received sequentially.

  5 and 6 show examples of the test result display means 102. FIG. 5 shows an example in which the test result display means 102 is configured by an LCD (liquid crystal display), and FIG. 6 shows an example in which the test result display means 102 is configured by an LED (light emitting diode). In the example of FIGS. 5 and 6, the number n of the sensors 2-1 to 2-n is “20”.

  Referring to FIG. 7, in the present invention, a sensor, for example, 2-1 is a test in which a test of its own sensor 2-1 is performed at any time or at a constant cycle without a command from the tester 1 or the like. Execution means 13, test result storage means 14 in which test results from test execution means 13 are stored, command reception means 12 for receiving a command sent by communication from a predetermined transmission path 3, and tester by command reception means 12 And a test result output means 15 for returning the test result stored in the test result storage means 14 to the tester 1 when a test-related command (for example, a test command) is received from 1.

  In other words, in the present invention, the sensors 2-1 to 2-n have a function of performing a test in the test execution unit 13 without a command from the tester 1, and store the test result in the test result storage unit 14. When a command (for example, a test command) related to a test from the tester 1 is received, the test result stored in the test result storage unit 14 is returned to the tester 1.

  In the sensor of FIG. 7, the test execution means 13 is configured to be able to execute a test for each test item, for example. Test items include an output value monitoring test for monitoring the output value of this sensor (a test to check whether or not this sensor is operating normally), and this sensor has a sensitivity compensation function (sensor Sensitivity compensation function monitoring test (a test to check whether the sensitivity compensation function is operating normally). In addition, various items such as a pseudo input response test can be provided, and the test execution means 13 executes at least one of these test items.

  FIG. 8 is a diagram showing a specific example of a sensor, for example, 2-1. The sensor 2-1 in FIG. 8 detects a physical quantity such as smoke density and converts it into an electrical signal (analog signal), and an analog signal output from the physical quantity detection unit 21 at a predetermined cycle. An A / D conversion unit 22 that samples and converts it into a digital signal, an address unit 23 in which the address of the sensor is set, a CPU 24 that controls the entire sensor such as abnormality (for example, fire) determination, ROM 25 storing control programs, RAM 26 used as various work areas, non-volatile memory 27 storing individual data unique to the sensor, and A / D detected by the physical quantity detector 21 The physical quantity detection result (output level from the A / D conversion unit 22) converted into a digital signal by the conversion unit 22 exceeds, for example, a predetermined operation threshold level (for example, a fire level). When the CPU 24 determines that there is an abnormality such as a fire, the transmission line between the state output unit 28 that outputs a signal indicating the operating state (ON state) to the transmission line 3 and the receiver 11 or the tester 1, for example. 3 is provided with a transmission unit (communication interface unit) 29 that performs transmission via the network 3.

  In other words, the sensor 2-1 in the example of FIG. 8 is configured as a so-called sensor address sensor (which belongs to an on / off type sensor from the detection output signal). In the configuration of FIG. 8, the CPU 24 can realize the functions of the test execution means 13 and the test result output means 15 of FIG. The cycle in which the test execution unit 13 of the sensor 2-1 executes the test is set by using a clock of the CPU 24 or a timer unit (not shown), specifically, any cycle such as every day. Can be set.

  Further, the transmission unit 29 can function as the command receiving unit 12 and the test result output unit 15 of FIG. That is, in this case, the transmission unit 29 is configured to be able to receive a predetermined command (for example, a test command) and has a function of sending a test result to the transmission path 3.

  In the configuration of FIG. 8, the RAM 26 or the nonvolatile memory 27 can function as the test result storage unit 14 of FIG. Further, the test result stored in the test result storage means 14 is a memory of the test result storage means 14 such as a test result for only normal / failure discrimination, a test result for a specific item, or a test result for all items. It can be set arbitrarily according to the capacity.

  7 and 8 is used in the monitoring control system (for example, disaster prevention system) shown in FIGS. 2 and 3, the receiver 11 is an addressable p-type receiver.

  In this case, the receiver 11 sets the monitoring level to, for example, a potential between L and C of the transmission line 3 of 24 V, and sets the operating level (on level) of the sensor to a potential between L and C, for example. The short-circuit level can be set at, for example, a position where the potential between L and C is 0V.

  Corresponding to such a system configuration, the state output unit 28 of the sensor in FIG. 8 sets the potential between the L and C of the transmission line 3 to the on level as a signal indicating the operation state (on state) of the sensor. It is designed to be 5V.

  In the receiver 11, at least one of the sensors 2-1 to 2-n is activated (turned on), and the potential between the L and C of the transmission line 3 becomes an on level of 5V. When this is detected, an address search pulse is generated using the potential of the short-circuit level (0 V) and on-level (5 V) of the sensor, and is sent to each sensor 2-1 to 2-n via the transmission line 3. It is supposed to be sent out.

  The transmission unit 29 of the sensor in FIG. 8 is configured to receive such an address search pulse from the receiver 11 via the transmission path 3, that is, the L and C lines. When receiving a pulse, the CPU 24 of this sensor counts (counts) the number of address search pulses received so far, and this count value (count value) is set in the address section 23 of this sensor. It is determined whether or not the address matches, and when the address matches, the state of the own sensor (on state or off state) is given to the transmission unit 29, so that the transmission unit 29 can, for example, Only when the state is ON, a signal to that effect is sent to the receiver 11 via the transmission line 3, that is, the L and C lines. Specifically, the transmission unit 29 holds, for example, the potential between the L and C of the transmission line 3 at 0 V for a predetermined period as a signal indicating that the state of its own sensor is on when the addresses match. Then, the signal is transmitted to the receiver 11 (held in a short-circuited state for a predetermined period). Thereby, the receiver 11 monitors whether the potential between L and C of the transmission line 3 is maintained at 0 V for a predetermined period, and the potential between L and C of the transmission line 3 is 0 V for a predetermined period. In this state, it can be specified that the sensor having the address corresponding to the number of address search pulses transmitted so far is in the operating state (ON state).

  Further, when the receiver 11 or the tester 1 performs the test by sequentially specifying addresses as in the second embodiment, the count value (count value) of the number of address search pulses from the tester 1 is obtained. When the sensor coincides with the address set in the address section 23 of the sensor and a test command (test command) is sent from the tester 1, the sensor is stored in the test result storage means 14. The test result is sent back to the tester 1 by the test result output means 15.

  Next, the processing operation of the test system having such a configuration will be described. In the following, for convenience of explanation, in the system of FIG. 1 (FIGS. 2 and 3), each of the sensors 2-1 to 2-n has the structure of FIG. 7 (FIG. 8) (on / off having an address). It is assumed that the receiver 11 is an addressable p-type receiver.

  9 and 10 are flowcharts showing an example of the test processing operation of the present invention. FIG. 9 is a flowchart showing the processing operation in the tester 1, and in the example of FIG. 9, the test means 101 of the tester 1 continuously applies to each of the sensors 2-1 to 2-n. A command related to the test (for example, a test command) is transmitted (sequentially). FIG. 10 is a flowchart showing the processing operation of the sensor, for example, 2-1.

  Referring to FIG. 9, when the test start means 100 (eg, test key) 100 is operated (step S1), the test means 101 of the tester 1 initializes the sensor address N to “1” (step S2). ). Next, the address N and the test command are output in combination, and the test result is returned from the sensor at the address N (step S3). In this case, since the address N is “1”, a test command is given to the sensor 2-1 corresponding to this address “1”, and this test command is received by the command receiving means 12 of the sensor 2-1. Then, the test result output means 15 of the sensor 2-1 returns the test result stored in the test result storage means 14 of the sensor 2-1 to the tester 1. Thereby, the test means 101 of the tester 1 receives the test result from the sensor 2-1, and displays the test result from the sensor 2-1 on the test result display means 102 (step S4).

  Next, the address N is incremented by “1” (step S5), and it is determined whether or not there is a sensor having the address N (step S6). If there is a sensor, the process returns to step S3. In this case, the address N becomes “2” in step S5, and since the sensor 2-2 corresponding to the address “2” exists in step S6, the process returns to step S3 and the sensor 2-2 is tested. A command is given, and the test result is returned from the sensor 2-2.

  In this way, the address N is sequentially incremented from “1” to “n”, and the test results are sequentially returned from the sensors 2-1 to 2-n corresponding to the addresses “1” to “n”. The test result display means 102 displays the test results from the sensors 2-1 to 2-n. In step S6, when the address N becomes “n + 1” and there is no sensor having the address “n + 1”, the test is terminated.

  Referring to FIG. 10, in the present invention, the sensor, for example, 2-1 normally monitors an abnormality such as a fire (step T1) and has its own time period (constant period). The sensor 2-1 is tested (steps T2 to T4). That is, in step T2, it is determined whether or not the test execution time has come. When the test execution time comes, the sensor 2-1 executes its own test in step T3. In step T4, the test is executed. The result is stored in the test result storage means 14.

  On the other hand, when the test execution time is not reached in step T2, it is determined whether a test command from the tester 1 has been received (step T5) as described above, and when a test command from the tester 1 is received. The test result output means 15 returns the test result stored in the test result storage means 14 to the tester 1 (step T6).

  As described above, in the present invention, the sensor, for example, 2-1 performs a test of its own sensor 2-1 at any time or at a constant cycle without a command from the tester 1, etc. Is stored in the test result storage means 14 and when a test-related command (for example, a test command) is received from the tester 1, the test result stored in the test result storage means 14 is returned to the tester 1. Therefore, even when it takes time to test the sensor 2-1, the tester 1 does not need to wait for a long time until the test of the sensor 2-1 is completed. Can be shortened. That is, in the present invention, even when the test of the sensor itself takes time, when the sensor receives a test command, it only returns the test result stored in advance to the tester 1, so that the tester 1 performs the test. Requires less time (ie, can be shortened).

  In the above example, the test results of all the sensors 2-1 to 2-n can be obtained by operating the test key once in the tester 1 (in the example of FIG. 9). The test results from the sensors 2-1 to 2-n can be automatically displayed on the test result display means 102 of FIG. 5 or FIG. Therefore, it is possible to automatically test all the sensors 2-1 to 2-n without designating the individual sensors of the plurality of sensors 2-1 to 2-n each time. Thereby, the time required for the test in the tester 1 can be further shortened.

  In particular, when the test result stored in the sensor test result storage means 14 is a test result of only normal / failure discrimination, a quicker test is possible, and the sensor is abnormal (failure, etc.). If there is, it is possible to investigate the cause of the abnormality at that time (real time).

  In the above example, in the tester 1, the test results of all the sensors 2-1 to 2-n can be obtained only by operating the test key once. In this case, there is an advantage that the time required for the test in the tester 1 can be further shortened as described above, but the tester 1 has a plurality of detectors 2-1 to 2-1 as in the conventional case. A single sensor of 2-n may be designated each time.

  In the above-described example, the sensor, for example, 2-1 is configured to perform a test at all times or at a constant cycle by the CPU 24. However, a test terminal is provided in the sensor 2-1, and the test terminal is connected to the test terminal. A test start signal may be input to cause the sensor 2-1 to execute a test.

  FIG. 11 is a diagram illustrating a configuration example of a sensor including a test terminal. Referring to FIG. 11, the sensor 2-1 further includes a test terminal 19 as test start signal input means capable of inputting a test start signal (for example, a trigger signal) for performing a test in the configuration of FIG. In this case, when the test start signal (trigger signal) is inputted to the test terminal 19 as the test start signal input means, the test execution means 13 performs the test processing of this sensor. Is supposed to run.

  Here, the test terminal 19 as the test start signal input means is constituted by, for example, a pair of terminals 19a and 19b. For example, the pair of terminals 19a and 19b is short-circuited (short-circuited) by providing a switch or the like. A test start signal (trigger signal) can be input by applying a predetermined voltage, for example, between the terminals 19a and 19b.

  FIG. 12 is a diagram showing a specific example of the sensor 2-1 in FIG. In the example of FIG. 12, this sensor 2-1 further outputs a test terminal 19 (19a, 19b) as test start signal input means and a test result (display) in the sensor 2-1 of FIG. For this purpose, an output unit 30 such as an indicator lamp or a display is provided.

  In the above example, the test start signal input means is configured by the test terminal 19 (19a, 19b). However, as the test start signal input means, any test start signal can be input. In addition to the configuration of the pair of terminals 19a and 19b, any configuration, for example, any terminal, any switch, or the like can be used.

  In the configuration example of the sensor 2-1 in FIG. 7 (FIG. 8) or FIG. 11 (FIG. 12), the sensor 2-1 itself may be provided with test result display means for displaying the test result. .

  FIG. 13 is a diagram showing an example of the sensor 2-1 further provided with test result display means 51 for displaying the test result in the configuration example of FIG. FIG. 14 is a diagram showing a specific example of the sensor 2-1 in FIG. 13. In the example of FIG. 14, an indicator lamp 60 is further provided in the sensor 2-1 in FIG. 8.

  FIG. 15 is a flowchart showing an example of the test processing operation in the sensor 2-1 when the sensor 2-1 has the configuration shown in FIG. 13 (FIG. 14).

  Referring to FIG. 15, in the present invention, a sensor, for example, 2-1 normally monitors an abnormality such as a fire (step T1) and has its own sensor at a predetermined time period (constant period). The test 2-1 is performed (steps T2 to T4). That is, in step T2, it is determined whether or not the test execution time has come. When the test execution time comes, the sensor 2-1 executes its own test in step T3. In step T4, the test is executed. The result is stored in the test result storage means 14.

  On the other hand, when the test execution time is not reached in step T2, it is determined whether a test command from the tester 1 has been received (step T5) as described above, and when a test command from the tester 1 is received. The test result output means 15 returns the test result stored in the test result storage means 14 to the tester 1 (step T6). At the same time, the sensor 2-1 displays a display based on the test result stored in the test result storage means 14 on the test result display means 51 (indicator lamp 60) provided in the sensor 2-1. Perform (step T7).

  Specifically, when the test result of the sensor 2-1 is normal, the indicator lamp 60 of the sensor 2-1 is turned on as shown in FIG. When the test result 1 is not normal (in the case of failure), the indicator lamp 60 of the sensor 2-1 is blinked as shown in FIG. The indicator lamp 60 is turned on by, for example, the CPU 24 driving the indicator lamp 60 continuously, and the indicator lamp 60 is blinked by, for example, the CPU 24 driving the indicator lamp 60 in pulses (intermittently). Then, the lighting / flashing operation of the indicator lamp 60 is stopped by a recovery operation from the receiver 11.

  As described above, when the test result of the sensor 2-1 is normal, the indicator lamp 60 of the sensor 2-1 is turned on as shown in FIG. When the test result of 1 is not normal (in the case of failure), as shown in FIG. 16B, the maintenance inspector, for example, makes this detection by blinking the indicator light 60 of the sensor 2-1. By simply looking at the state of the indicator lamp 60 of the device 2-1, it is possible to immediately grasp whether the sensor 2-1 is normal or abnormal (failure) (when the test result is not normal (failure)) Since the indicator lamp 60 of the sensor blinks, an abnormal sensor (failure sensor) can be easily confirmed).

  Specifically, for example, when the remote test of the sensors 2-1 to 2-n connected to the P-type system as shown in FIG. When it is found that a (failure sensor) exists, it is determined which of the sensors 2-1 to 2-n is not normal (failed). By looking at the status of the indicator light (by seeing which indicator of the indicator light is blinking), it can be immediately grasped.

  Thus, in the configuration examples of FIGS. 13 and 14, when the test result of the sensor is normal, the indicator lamp 60 of the sensor is turned on and at the same time, the test result indicating that the sensor is normal indicates the L and C lines. If the sensor test result is not normal (in the case of failure), the indicator lamp 60 of the sensor flashes and at the same time indicates that it is not normal (indication of failure). Are returned to the receiver 11 via the L and C lines. More specifically, the test result indicating that the test is normal is returned to the receiver 11 via, for example, the L and C lines as a fire signal, and in this case, the receiver 11 issues a report. On the other hand, the test result indicating that the sensor is not normal (failure) is returned as a pulse to the receiver 11 via the L and C lines. Display).

  FIGS. 13 and 14 are configured as modified examples of FIGS. 7 and 8. However, FIGS. 11 and 12 are modified in the same manner as FIGS. You can also.

  13 and 14, the test result display means 51 (indicator lamp 60) is displayed based on the test result of the sensor, and the test result of the sensor is returned to the receiver 11. Based on the test result of the sensor, the sensor can be provided with a function of only displaying the test result display means 51 (indicator lamp 60).

  FIGS. 17 and 18 are diagrams respectively showing modified examples of FIGS. 13 and 14 (FIGS. 7 and 8). In the examples of FIGS. 17 and 18, the test result output means 15 in FIG. 13 and FIG. The output unit 28 is not provided. That is, in the example of FIGS. 17 and 18, only the test result display means 51 (indicator lamp 60) for displaying the test result of the sensor is provided, and the test result is returned to the receiver 11. It does not have a function to do.

  FIG. 19 is a flowchart showing an example of a test processing operation in the sensor 2-1 when the sensor 2-1 has the configuration shown in FIG. 17 (FIG. 18).

  Referring to FIG. 19, in the present invention, a sensor, for example, 2-1 normally monitors an abnormality such as a fire (step T1), and is self-detected at a predetermined time period (constant period). The test 2-1 is performed (steps T2 to T4). That is, in step T2, it is determined whether or not the test execution time has come. When the test execution time comes, the sensor 2-1 executes its own test in step T3. In step T4, the test is executed. The result is stored in the test result storage means 14.

  On the other hand, when the test execution time is not reached in step T2, it is determined whether a test command from the tester 1 has been received (step T5) as described above, and when a test command from the tester 1 is received. The sensor 2-1 displays on the test result display means 51 (indicator lamp 60) provided in the sensor 2-1 based on the test result stored in the test result storage means 14 ( Step T7).

  Specifically, when the test result of the sensor 2-1 is normal, the indicator lamp 60 of the sensor 2-1 is turned on as shown in FIG. When the test result of -1 is not normal (in the case of failure), as shown in FIG. 16B, the indicator lamp 60 of the sensor 2-1 is blinked. The indicator lamp 60 is turned on by, for example, the CPU 24 driving the indicator lamp 60 continuously, and the indicator lamp 60 is blinked by, for example, the CPU 24 driving the indicator lamp 60 in pulses (intermittently). Then, the lighting / flashing operation of the indicator lamp 60 is stopped by a recovery operation from the receiver 11.

  As described above, when the test result of the sensor 2-1 is normal, the indicator lamp 60 of the sensor 2-1 is turned on as shown in FIG. When the test result of 1 is not normal (in the case of failure), as shown in FIG. 16B, the maintenance inspector, for example, makes this detection by blinking the indicator light 60 of the sensor 2-1. By simply looking at the state of the indicator lamp 60 of the device 2-1, it is possible to immediately grasp whether the sensor 2-1 is normal or abnormal (failure) (when the test result is not normal (failure)) Since the indicator lamp 60 of the sensor blinks, an abnormal sensor (failure sensor) can be easily confirmed).

  Specifically, for example, when the remote test of the sensors 2-1 to 2-n connected to the P-type system as shown in FIG. When it is found that a (failure sensor) exists, it is determined which of the sensors 2-1 to 2-n is not normal (failed). By looking at the status of the indicator light (by seeing which indicator of the indicator light is blinking), it can be immediately grasped.

  FIGS. 17 and 18 are configured as modified examples of FIGS. 7 and 8. However, FIGS. 11 and 12 are modified in the same manner as FIGS. You can also

  In each of the above examples, the sensors 2-1 to 2-n are described as being configured as sensor address sensors as shown in FIGS. 8, 12, 14, and 18. However, as the sensors, In the example of FIG. 8, at least the command receiving means 12, the test execution means 13, the test result storage means 14, the test result output means 15, and the test start signal input means (for example, a test terminal) in the example of FIG. 19, and in the example of FIG. 14, the command receiving unit 12, the test execution unit 13, the test result storage unit 14, the test result output unit 15, and the test result display unit 51. 18, and in the example of FIG. 18, if the command receiving unit 12, the test execution unit 13, the test result storage unit 14, and the test result display unit 51 are provided. Well, any model Sensors (e.g., the analog type sensor, the normal on-off type sensor) can be applied to. In the configuration examples of FIGS. 8, 12, 14, and 18, the address unit 23, the nonvolatile memory 27, and the like are not necessarily provided.

  Further, the test method of the present invention can be applied not only to a sensor but also to an arbitrary repeater. That is, when a sensor is connected to the repeater, at least the command receiving means 12, the test execution means 13, the test result storage means 14, the test result output means 15 and / or the test result display are connected to the repeater. Means 51 and test start signal input means (for example, a test terminal) 19 can be provided to test the repeater and the sensor connected to the repeater.

  Further, in each of the above-described examples, the monitoring control system is assumed to be a disaster prevention system, for example. In this case, the detector is assumed to be a fire detector, for example. However, the present invention is not limited to the disaster prevention system. It can be applied to any system. In this case, the present invention is not limited to a fire sensor, and the present invention can be applied to an arbitrary sensor such as a security sensor.

  Further, in the configuration example of the test system of FIG. 1 (FIGS. 2 and 3), the sensor 2-1 to 2-n and / or the tester 1 detects the amount of contamination of the sensors 2-1 to 2-n. It can also have a function to do. FIG. 20 is a diagram illustrating a configuration example of a sensor having a function of detecting the amount of dirt in the system configuration of FIG. In FIG. 20, only one sensor 2-1 is shown for convenience of explanation. Referring to FIG. 20, in a test system for testing a sensor, a sensor, for example, 2-1 includes a dirt detecting means 41 for detecting the amount of dirt of the sensor 2-1, and a dirt detecting means according to a command from the tester. Return means 42 for returning the amount of dirt detected at 41 to the tester 1, and when the tester 1 receives the amount of dirt from the return means 42 of the sensor 2-1, it displays the amount of dirt. It is like that.

  In the conventional on / off type sensor, there is no means for detecting the sensor even if it is soiled, and the presence or absence of soiling cannot be detected unless a sensitivity test is performed. However, in the configuration of FIG. Since the amount of dirt can be displayed using, it is possible to check whether the sensor operates normally without performing a sensitivity test of the sensor.

  FIG. 21 is a diagram showing a specific example of the sensor shown in FIG. 20. In FIG. 21, the sensor, for example, 2-1, is provided with sensitivity compensation means 43 for compensating the sensitivity. The sensitivity compensation amount in the sensitivity compensation means 43 is detected as the amount of dirt. Here, as a sensor having a sensitivity compensation function, for example, a sensor disclosed in Japanese Patent Laid-Open No. 10-255176 can be used.

FIG. 22 is a diagram showing an example of an on / off type sensor having a sensitivity compensation function. Referring to FIG. 22, the on / off type sensor, for example, 2-1, includes a physical quantity detection means 31 for detecting a predetermined physical quantity such as smoke density, and an output level OUT ₁ from the physical quantity detection means 31 for a predetermined period. Sample means 33 for sampling at (sample period T) and initial value of compensation data R ₁ for output level OT ₁ (OUT ₁ ) from physical quantity detection means 31 (for example, the same value as the drift component of output level) D ₁ an initial value setting means 34 but is set, a sensitivity compensation value holding means 35 for holding the sensitivity compensation value E _1, the sensitivity compensation to an initial value D ₁ of the compensation data R ₁ which is set to an initial value setting means 34 setting a value obtained by adding the sensitivity compensation value E ₁ held in the value holding means 35 as the compensation data R ₁ and compensation data setting means 36 (updated set) is, by sampling means 33 of the output level OT ₁ A sample number counting means 40 for counting the sample number SP, compares the values of the sampling means 33 and the output level OT ₁ that samples and compensation data setting means 36 compensation data R ₁ that is set in the result of the comparison Compensation counting means (compensation counter) 37 in which the count value CNT increases or decreases in response to this, and when the number of sample times SP counted by the sample number counting means 40 reaches a predetermined number of times SP ₀ , compensation for that time Sensitivity compensation value changing means 38 for changing the sensitivity compensation value E ₁ held in the sensitivity compensation value holding means 35 in accordance with the count value CNT of the counting means 37 and the output level OT ₁ sampled by the sample means 33 are used for compensation. a compensation means 39 for compensating the compensation data R ₁ that is set in the data setting unit 36, a compensated level O ₁ from the compensation means 39 a predetermined A judgment means 70 for judging an abnormality such as a fire or a gas leak as compared with an operation threshold level (for example, a fire report level) AL, and a judgment result output means 71 for outputting a judgment result by the judgment means 70 are provided. Yes.

  As a specific example of a sensor having such a sensitivity compensation function, for example, 2-1, it can be made to have the same configuration as the configuration of FIG. That is, it can be configured as a so-called sensor address sensor (belonging to an on / off type sensor from the detection output signal).

  When the sensor as shown in FIG. 8 is provided with a sensitivity compensation function, the physical quantity detection unit 31 and the sample unit 33 in FIG. 22 correspond to the physical quantity detection unit 21 and the A / D conversion unit 22 in FIG. 8, respectively. The number-of-samples counting means 40, the compensating counting means 37, the sensitivity compensation value changing means 38, and the compensating means 39 are realized by the CPU 24 of FIG. 8, and the initial value setting means 34 and sensitivity compensation value holding means of FIG. 35. The compensation data setting means 36 is realized by the RAM 26 and / or the nonvolatile memory 27 of FIG.

As shown in FIG. 22 (FIG. 8), when an on / off type sensor is provided with a sensitivity compensation function, the CPU 24 of the sensor uses the output level OT ₁ sampled by the A / D converter 22 as shown in FIG. Through (d), FIG. 24, and FIG. 25 (a), the sensitivity can be compensated by the sensor itself.

That is, FIGS. 23A to 23D are diagrams illustrating an example of the sensitivity compensation value changing process. FIGS. 24A and 24B show a state in which a part of FIGS. 23A and 23B is enlarged in the direction of the time axis. 23 (a) and 24 (a) show an analog sensor, for example, 2-1 (for example, a photoelectric smoke sensor) A under a normal environmental condition where no fire or the like has occurred. FIG. 24 is a diagram illustrating an example of fluctuations in the output level OT ₁ (sampled output level (sample period = T)) sampled by the / D conversion unit 22; in the examples of FIGS. 23 (a) and 24 (a), FIG. The output level sampled by the A / D converter 22 of this analog sensor (photoelectric smoke sensor) 2-1 has a drift component D ₁ in the initial state, and then the sensor becomes dirty. There is a tendency to increase with time due to such factors. That is, the example of FIG. 23A is an aging curve of the output level sampled by the A / D converter 22 of the sensor 2-1 over a considerably long period such as several months or one year. . Further, FIGS. 23A to 23D show cases where temporary factors such as noise are not included in the output level OT ₁ . Further, in FIG. 23 (a), the sample number SP which is counted by sample number counting means 40 is also shown the state on reaching the predetermined number of times SP _0. Note that the predetermined number of times SP ₀ in this case is assumed to be that the output level changes over a long period such as several months or one year, so the number of times (relatively large number) commensurate with this (SP ₀ = SP ₁ ) is used.

When the sensor 2-1 is configured as shown in FIG. 22, it is sampled by the A / D converter 22 of the analog sensor 2-1 as shown in FIGS. 23 (a) and 24 (a). For the output level OT ₁ , the count value CNT, the sensitivity compensation value E ₁ , and the compensation data R ₁ of the compensation counter 37 are shown in FIG. 23 (b) (FIG. 24 (b)) and FIG. 23 (c), respectively. ), And updated as shown in FIG.

That is, as shown in FIG. 23D, the compensation data R ₁ is initially set to the same value D ₁ as the drift component and then sampled by the A / D converter 22 of the sensor 2-1. depending on the change due to dirt of the output level OT _1, FIG. 23 (b), the count value CNT of the compensation counter 37 changes as shown in FIG. 24 (b). When the sample number SP counted by the sample number counting unit 40 reaches the predetermined number SP ₀ , the sensitivity compensation value changing unit 38 causes the count value CNT of the compensation counter 37 to exceed, for example, 50% of the predetermined number SP _0. When the count value CNT exceeds 50% of the predetermined number SP ₀ , the sensitivity compensation value E ₁ held in the sensitivity compensation value holding means 35 is calculated as shown in FIG. The count value CNT is updated (changed) in a direction corresponding to the sign of the count value CNT when the absolute value of CNT exceeds 50% of the predetermined number SP ₀ (positive in the example of FIG. 23B). That is, in the example of FIG. 23C, the sensitivity compensation value E ₁ increases (updates) by “1” every time the absolute value of the count value CNT of the compensation counter 37 exceeds the predetermined threshold value TH _1. . Then, the compensation data R ₁ is updated according to the sensitivity compensation value E ₁ updated as described above, as shown in FIG.

Incidentally, in FIG. 23 (a), the output level OT ₁ sampled at A / D converter 22 of the analog sensor 2-1, the compensation data R ₁ for this output level OT ₁ (FIG. 23 (d The compensation data R ₁ ) shown in)) is also shown for comparison. In FIG. 23 (a), the level obtained by subtracting the compensation data R ₁ from the output level OT ₁ (value), the time is the value nearly "0" even after the elapse of analog sensor 2-1 A It can be seen from the output level sampled by the / D converter 22 that the drift component D ₁ is compensated (removed) along with the aging and aging due to dirt and the like. Therefore, to calculate the compensation data R ₁ a minus level (value) O ₁ from the output level OT ₁ with compensating means 39, by using the compensated level O _1, the abnormality judgment such as a fire or gas leak By doing so, even when the output level fluctuates due to contamination of the sensor or the like, it is possible to reduce these effects and accurately determine the abnormality.

25 (a) to 25 (d) show the effect of temporary noise NS on the output level sampled by the A / D converter 22 of the sensor 2-1 over a long period such as several months or one year. It is a figure which shows the sensitivity compensation processing operation | movement in case it is included. In this case, as shown in FIG. 25 (b), the count value CNT ′ of the compensation counter 37 has its optimum count value CNT (FIG. 23 when the output level does not include temporary noise NS). Although the deviation due to the influence of the temporary noise NS occurs with respect to the count value CNT) as shown in b), the sensitivity compensation value changing means 38 is counted by the sample number counting means 40 in the sensor configuration of FIG. When the number of sample times SP reached the predetermined number SP ₀ , the absolute value of the count value CNT ′ of the compensation counting means 37 at that time is a predetermined number SP ₀ of the number of samples counted by the sample number counting means 40. When the value exceeds 50%, the sensitivity compensation value E ₁ ′ held in the sensitivity compensation value holding unit 35 is changed. Therefore, the absolute value of the count value CNT of the compensation counter 37 is counted by the sample number counting unit 40. Number of samples In determining whether or not the predetermined number SP ₀ of 50% has been exceeded, the influence of the deviation of CNT ′ from CNT is very small (that is, even if the output level includes temporary noise NS) The cumulative effect on the count value CNT ′ is very small), and the sensitivity compensation value E ₁ ′ is temporarily adjusted to the optimum sensitivity compensation value E ₁ (output level temporarily as shown in FIG. 25C). This is almost the same as the sensitivity compensation value E ₁ ) as shown in FIG. 23C when no noise NS is included. Thus, as shown in the compensation data R ₁ 'also FIG 25 (d), becomes substantially the same as the optimal compensation data R ₁ (FIG. 23 (d) as shown in a compensation data R _1), an output Even when the level includes a temporary noise NS, the cumulative influence can be significantly reduced.

FIG. 25A shows the output level OT ₁ sampled by the A / D converter 22 of the analog sensor 2-1, and compensation data R ₁ ′ for the output level OT ₁ (FIG. 25 ( The compensation data R ₁ ′) shown in d) is also shown. In FIG. 25A, the level (value) obtained by subtracting the compensation data R ₁ ′ from the output level OT ₁ is the level (value) obtained by subtracting the compensation data R ₁ from the output level in FIG. The output level OT ₁ sampled by the A / D converter 22 of the analog sensor 2-1 is almost the same as the drift component D _{1 as} well as compensated (removed) over time and aging due to dirt, etc. It can be seen that there is almost no influence of the temporary noise NS. Therefore, even if it contains temporary factors such as noise in the output level OT _1, using a level (value) obtained by subtracting the compensation data R ₁ 'from the output level OT _1, abnormality such as a fire or gas leak It is possible to make an accurate determination.

As described above, according to the example of FIG. 22, it is effective that the compensation data R ₁ for compensating the sensitivity changes from the optimum value due to a long-term temporary factor such as several months or one year. Even when there is a long-term temporary factor, it is possible to accurately determine an abnormality such as a fire or a gas leak. That is, the necessity of changing the sensitivity compensation value E _1, because of the determination, separated a certain period (sample number), even long-term transient factors by the output level varies, can significantly reduce the influence The optimum sensitivity compensation value can be maintained.

  As a result, it is possible to effectively prevent a situation in which compensation data for compensating sensitivity changes from an optimum value due to, for example, a long-term factor.

In this case as well, the sensitivity compensation value E ₁ can be changed on the condition that the ratio (ratio) of the count value CNT of the compensation counting means 37 to the sample count (fixed count) SP ₀ exceeds 50%, for example. However, this ratio is not limited to 50%, and any ratio can be used as necessary.

  In this on / off type sensor, the output level O whose sensitivity has been compensated in this way is compared with, for example, an operation threshold level (for example, a fire alarm level) AL set in the RAM 26 or the nonvolatile memory 27, Fire judgment processing can be performed. Specifically, this sensor compares an output level (for example, smoke density) O with sensitivity compensation with an operation threshold level AL set in the RAM 26 or the nonvolatile memory 27, and outputs an output level with sensitivity compensation. When O exceeds the operation threshold level AL, it can be determined as an abnormality such as a fire.

In this way, when the sensor has a sensitivity compensation function, that is, when the sensor has the configuration of FIG. 21, the dirt detection means 41 sets the sensitivity compensation amount, R ₁ in the above example. It can be detected as the amount of dirt.

  In the above example, the on / off type sensor is described as being configured as a sensor address sensor. However, as long as it has a sensitivity compensation function, it can be applied to any type of on / off type sensor. Can do. Further, when paying attention only to such sensitivity compensation function and dirt detection function, the address unit 23 and the like are not necessarily provided in the sensor of the configuration example of FIG.

  In the above-described example, the on / off type sensor is provided with the sensitivity compensation function and the dirt detection function. However, the sensitivity compensation function and the dirt detection function as described above can be provided, for example, in a repeater.

  FIG. 26 is a diagram showing another specific example of the sensor shown in FIG. The sensor in FIG. 26 is a smoke sensor having a smoke detector 44, and the sensor is provided with a storage means 45 for storing an output value from the smoke detector 44 at the time of manufacture of the sensor. The dirt detecting means 41 detects the amount of dirt by comparing the output value stored in the storage means 45 with the latest output value from the smoke detector 44.

  In the above example (FIGS. 20, 21, and 26), the dirt detection means 41 is provided in the sensor. However, the dirt detection can be performed in the tester 1. In other words, in the test system as shown in FIG. 1 for testing the sensors, the sensors 2-1 to 2-n have a function of communicating with the tester 1, and the sensors 2-1 to 2-n. n sends information necessary for detecting dirt of the sensors 2-1 to 2-n to the tester 1, and the tester 1 is necessary for detecting dirt sent from the sensors 2-1 to 2-n. It is also possible to perform the dirt detection based on the information and display the detected dirt amount.

  In the system shown in FIGS. 20, 21, and 26, as a method for displaying the amount of dirt in the tester 1, if the sensor is a smoke sensor, it is easy to display it in terms of smoke density. It is difficult to make intuitive judgments. Therefore, a method of calculating the number of days until the dirt compensation limit from the number of days (months) elapsed with respect to the increase in smoke density (= dirt amount) and displaying the number of days (for example, “about six months until the sensor cleaning time” Using a method such as “), it is possible to grasp the specific cleaning time (replacement time). In this case, the method of calculating by adding a calendar function to the sensor, the output date of the smoke detector at the time of manufacture of the sensor, the stored date and time are stored, and the date and time when the amount of dirt is taken into the tester is also stored. A method of taking in and calculating from the date and time information in the tester can be considered.

  FIG. 27 is a simple example of this calculation method. In FIG. 27, the smoke density is 4% / m after 24 months. Assuming that the relationship between the smoke density and the elapsed time changes as a linear function, the smoke detector reaches the dirt compensation limit at 30 months. Therefore, in this case, the tester 1 can display, for example, “6 months after the cleaning time”. This display can also be performed on the display unit of the tester shown in FIGS. For example, it is possible to display the number of months until the cleaning time by the number of ◯ marks, or when the cleaning is necessary, display the X marks.

In each example described above, the monitoring control system is, for example, a disaster prevention system. However, the present invention is not limited to the disaster prevention system, and can be applied to any system such as a crime prevention system. In this case, the receiver and the sensor are not limited to those for fire monitoring, and the present invention can be applied to any receiver and sensor for security monitoring.

It is a figure which shows the structural example of the test system which concerns on this invention. It is a figure which shows the 1st specific example of the test system of FIG. It is a figure which shows the 2nd specific example of the test system of FIG. It is a figure which shows the structural example of the test device which concerns on this invention. It is a figure which shows the example of a test result display means. It is a figure which shows the example of a test result display means. It is a figure which shows the structural example of the sensor which concerns on this invention. It is a figure which shows the specific example of the sensor which concerns on this invention. It is a flowchart which shows an example of the test processing operation | movement of this invention. It is a flowchart which shows an example of the test processing operation | movement of this invention. It is a figure which shows the structural example of the sensor provided with the test terminal. It is a figure which shows the specific example of the sensor provided with the test terminal. It is a figure which shows the structural example of the sensor provided with the test result display means. It is a figure which shows the specific example of the sensor of FIG. It is a flowchart which shows an example of the test processing operation | movement of the sensor of FIG. 13, FIG. It is a figure for demonstrating lighting and blinking of an indicator lamp. It is a figure which shows the other structural example of the sensor provided with the test result display means. It is a figure which shows the specific example of the sensor of FIG. 19 is a flowchart showing an example of a test processing operation of the sensor of FIGS. 17 and 18. It is a figure which shows the structural example of the detector and tester which have the function to detect the amount of dirt in the system configuration | structure of FIG. It is a figure which shows the specific example of the sensor of FIG. It is a figure which shows an example of the on-off type sensor which has a sensitivity compensation function. It is a figure which shows an example of the change process of a sensitivity compensation value. It is a figure which shows the state which expanded a part of Fig.23 (a), (b) to the direction of a time-axis. It is a figure which shows the sensitivity compensation process operation | movement when the influence by temporary noise is included in the output level from a sensor. It is a figure which shows the other specific example of the sensor of FIG. It is a figure for demonstrating an example of the display method of the dirt amount in a test device. It is a figure which shows the structure of the conventional test system.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tester 11 Receiver 2-1 to 2-n Sensor 3 Transmission path 12 Command receiving means 13 Test execution means 14 Test result storage means 15 Test result output means 19 Test terminal 33 Sample means 34 Initial value setting means 35 Sensitivity compensation Value holding means 36 Compensation data setting means 37 Compensation counting means 38 Sensitivity compensation value changing means 39 Compensation means 40 Sample number counting means 70 Determination means 71 Determination result output means 31 Physical quantity detection means 21 Physical quantity detection part 22 A / D conversion part 23 Address part 24 CPU
25 ROM
26 RAM
27 Nonvolatile memory 28 Status output unit 29 Transmission unit 41 Dirt detection unit 42 Return unit 43 Sensitivity compensation unit 44 Smoke detection unit 45 Storage unit 51 Test result display unit 60 Indicator lamp 100 Test start unit 101 Test unit 102 Test result display unit

Claims (6)

In a test system for testing a sensor, the sensor includes a dirt detection means for detecting the dirt amount of the sensor, and a return means for returning the dirt amount detected by the dirt detection means to the tester according to a command from the tester. And the tester displays the amount of dirt when the amount of dirt is received from the return means of the sensor. 2. The test system according to claim 1, wherein the sensor is provided with sensitivity compensation means for compensating sensitivity, and the dirt detection means detects a compensation amount of sensitivity in the sensitivity compensation means as a dirt amount. A test system characterized by 2. The test system according to claim 1, wherein the sensor is a smoke sensor having a smoke detection unit, and the sensor stores an output value from the smoke detection unit when the sensor is manufactured. Storage means is provided, and the dirt detection means detects the amount of dirt by comparing the output value stored in the storage means with the latest output value from the smoke detector. A test system characterized by A test method for testing a sensor, wherein the sensor detects the amount of dirt on the sensor, and returns the detected amount of dirt to the tester according to a command from the tester, and the tester returns from the sensor. When the received amount of dirt is received, the amount of dirt is displayed. It has a dirt detecting means for detecting the dirt amount of the sensor and a sensitivity compensating means for compensating the sensitivity, and the dirt detecting means detects the compensation amount of sensitivity in the sensitivity compensating means as the dirt amount. A sensor characterized by that. In a test system for testing a sensor, the sensor has a function of communicating with the tester, and the sensor sends information necessary for detecting the contamination of the sensor to the tester. The tester is characterized in that it detects dirt based on information necessary for dirt detection sent from a sensor and displays the detected dirt amount.

Images