CN102881108B - Dust test device and test method for fire detector - Google Patents
Dust test device and test method for fire detectorDownload PDFInfo
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Abstract
Description
Translated fromChinese技术领域technical field
本发明涉及火灾探测器性能检测，特别是一种用于测试点型感烟火灾探测器抗粉尘能力的试验装置与试验方法。The invention relates to performance testing of a fire detector, in particular to a test device and a test method for testing the dust-resistant ability of a point-type smoke detector.
背景技术Background technique
空气中悬浮的粉尘是引发点型感烟火灾探测器误报警的一个主要因素；同时，粉尘在火灾探测器的探测腔中长时间沉积，会导致火灾探测器工作点发生漂移。而工作点的漂移则有可能发生漏报警或频繁误报警。因此。对火灾探测器进行粉尘试验，检验火灾探测器抗粉尘能力，对使用和改进火灾探测器具有重要意义。Dust suspended in the air is a major factor causing false alarms of point-type smoke detectors; at the same time, dust deposits in the detection chamber of the fire detector for a long time will cause the working point of the fire detector to drift. The drift of the working point may cause missing alarms or frequent false alarms. therefore. It is of great significance for the use and improvement of fire detectors to conduct dust tests on fire detectors and to test the ability of fire detectors to resist dust.
GB/T2423.37-2006/IEC60068-2-68:1994《电工电子产品环境试验》对电工电子产品规定了不同的“沙尘试验”方法，主要评价沙尘对电工电子产品的一般性影响，例如沙尘导致接触故障、运动轴承卡死、表面磨损以及通风孔或过滤器的堵塞等。这些试验方法对于测试火灾探测器由于粉尘干扰导致的误报或者工作点漂移是不合适的，因此在火灾探测报警领域一直没有采用这些试验方法对火灾探测器进行测试。GB/T2423.37-2006/IEC60068-2-68:1994 "Environmental Testing of Electrical and Electronic Products" stipulates different "dust test" methods for electrical and electronic products, mainly to evaluate the general impact of dust on electrical and electronic products, Examples include contact failures caused by sand and dust, seizure of motion bearings, surface wear and clogging of ventilation holes or filters. These test methods are not suitable for testing false alarms or operating point drift of fire detectors caused by dust interference, so these test methods have not been used to test fire detectors in the field of fire detection and alarm.
美国UL标准UL268《Smoke detectors for fire alarm signaling system》（感烟火灾探测器）提出了一种火灾探测器粉尘试验方法，其目的是通过测试，确认火灾探测器的灵敏度是否受灰尘的累积影响而过度衰减。该试验方法是在0.09m3的试验箱内，使用60g水泥粉尘，通过压缩空气实现扬尘，将断电后的火灾探测器暴露在粉尘中15分钟，然后从试验箱中取出，通电进行灰烟和黑烟灵敏度测试。该试验是在火灾探测器断电情况下进行，无法评价火灾探测器对粉尘误报的抑制能力；另外，将火灾探测器从试验箱中取出进行测试，会导致粉尘在探测腔中的分布和累积情况发生变化，试验结果不能真实地反映粉尘对火灾探测器的影响程度。The American UL standard UL268 "Smoke detectors for fire alarm signaling system" (smoke detectors) proposes a fire detector dust test method, the purpose of which is to confirm whether the sensitivity of the fire detector is affected by the accumulation of dust through testing. Excessive attenuation. The test method is to use 60g of cement dust in a 0.09m3 test box to realize dust raising by compressed air, expose the fire detector after power off to the dust for 15 minutes, then take it out of the test box, and turn on the power to carry out ash smoke test. and black smoke sensitivity tests. This test was carried out when the fire detector was powered off, so it was impossible to evaluate the ability of the fire detector to suppress false alarms of dust; in addition, taking the fire detector out of the test box for testing would cause the distribution and distribution of dust in the detection chamber The accumulation situation changes, and the test results cannot truly reflect the degree of influence of dust on fire detectors.
发明内容Contents of the invention
针对上述现有技术存在的问题，本发明的目的是提供一种可对点型感烟火灾探测器抗粉尘能力进行测量的火灾探测器粉尘试验装置与试验方法，为正确评价火灾探测器的抗粉尘能力提供科学依据。In view of the problems existing in the above-mentioned prior art, the object of the present invention is to provide a fire detector dust test device and test method that can measure the dust resistance of point-type smoke fire detectors, in order to correctly evaluate the resistance of fire detectors Dust capacity provides scientific basis.
为实现上述目的，本发明提供的火灾探测器粉尘试验装置，包括试验箱体、粉尘源和试验参数监控装置；所述试验箱体内有火灾探测器安装架，该安装架通过引管与试验箱体的上盖固定连接；试验箱体的底部有喷嘴，该喷嘴通过进气管与粉尘源连接；所述试验参数监控装置包括粉尘浓度计、温湿度计、气压表和电热丝，其中粉尘浓度计、温湿度计和气压表分别通过法兰与试验箱体相接；电热丝通过绝缘护套缠绕在试验箱体的外壁上。In order to achieve the above object, the fire detector dust testing device provided by the present invention includes a test box body, a dust source and a test parameter monitoring device; a fire detector installation frame is arranged in the test box body, and the installation frame is connected to the test box through the introduction pipe. The upper cover of the body is fixedly connected; there is a nozzle at the bottom of the test box, and the nozzle is connected to the dust source through the air inlet pipe; the test parameter monitoring device includes a dust concentration meter, a temperature and humidity meter, a barometer and an electric heating wire, wherein the dust concentration meter , Thermo-hygrometer and barometer are respectively connected to the test box through the flange; the heating wire is wound on the outer wall of the test box through the insulating sheath.
火灾探测器性能受粉尘影响主要分两种情况：一种是火灾探测器用于没有特殊扬尘过程的场所（如宾馆客房、办公室、实验室、仓储室等），在此环境条件下，主要是低密度浮尘通过扩散、静电吸附在光学探测腔内长期累积对火灾探测器的性能造成影响。另一种是火灾探测器用于一般工业与民用建筑的门厅、走廊、车间、古建筑等开敞或半开敞空间场所，由开放的自然环境（如开窗）或者人为扰动（如清扫、空调造成的空气循环等）对火灾探测器引发粉尘短时间干扰。The performance of fire detectors is affected by dust mainly in two situations: one is that fire detectors are used in places without special dust processes (such as hotel rooms, offices, laboratories, storage rooms, etc.), and under these environmental conditions, mainly low Density floating dust accumulates in the optical detection cavity for a long time through diffusion and electrostatic adsorption, which affects the performance of fire detectors. The other is that fire detectors are used in open or semi-open spaces such as foyers, corridors, workshops, and ancient buildings in general industrial and civil buildings. caused by air circulation, etc.) cause short-term interference of dust on fire detectors.
利用上述火灾探测器粉尘试验装置，本发明为火灾探测器性能受粉尘长期累积影响和抗粉尘短时间干扰能力分别提供下述试验方法。Using the above-mentioned fire detector dust test device, the present invention provides the following test methods for the performance of fire detectors affected by long-term accumulation of dust and the ability to resist short-term interference of dust.
火灾探测器性能受粉尘长期累积影响试验方法，包括以下步骤：The test method for the performance of fire detectors affected by long-term accumulation of dust includes the following steps:
（1）设定试验条件：包括根据火灾探测器实际使用环境空气粉尘情况，通过调查和统计确定试验箱体内火灾探测器周围的粉尘浓度；悬浮尘组成及粒径分布以A2尘为主；保持试验箱体内悬浮尘均匀；温度为正常实验室温度；相对湿度≤25%；通过接地克服静电积累；根据试验的严酷程度要求和粉尘浓度设定试验持续时间；(1) Setting the test conditions: including determining the dust concentration around the fire detector in the test chamber through investigation and statistics according to the actual use of the fire detector in the ambient air and dust; the suspended dust composition and particle size distribution are mainly A2 dust; keep The suspended dust in the test box is uniform; the temperature is the normal laboratory temperature; the relative humidity is ≤25%; the static electricity accumulation is overcome by grounding; the test duration is set according to the severity of the test and the dust concentration;
（2）对火灾探测器进行粉尘试验前的初始测量：取两个火灾探测器样品，将一个设置为最高灵敏度，另一个设置为最低灵敏度，分别测量其响应阈值，并作记录；(2) Initial measurement before the dust test of the fire detector: take two fire detector samples, set one as the highest sensitivity and the other as the lowest sensitivity, measure their response thresholds respectively, and make records;
（3）将上述经过初始测量的两个火灾探测器安装在所述火灾探测器粉尘试验装置的试验箱体内的火灾探测器安装架上，通电稳定运行两小时后开始进行粉尘试验：给电热丝通电，使试验箱体内温度和相对湿度达到试验条件要求；调节含尘压缩空气的压力和流量，使粉尘从试验箱体底部的喷嘴中向试验箱体内均匀连续注入，试验箱体内气压与外部大气压保持基本一致，通过粉尘浓度计监视当前试验箱体内粉尘浓度值，并通过人工闭环控制，使粉尘浓度按试验条件要求值保持稳定；待试验持续时间达到试验条件设定值时停止粉尘注入，保持试验箱体关闭状态，使粉尘自由沉降4小时；(3) Install the above two fire detectors that have undergone initial measurement on the fire detector installation frame in the test box of the fire detector dust test device, and start the dust test after two hours of stable operation with power on: feed the heating wire Power on to make the temperature and relative humidity in the test chamber meet the requirements of the test conditions; adjust the pressure and flow of dust-laden compressed air so that the dust is evenly and continuously injected into the test chamber from the nozzle at the bottom of the test chamber. Keep basically the same, monitor the current dust concentration value in the test box through the dust concentration meter, and use manual closed-loop control to keep the dust concentration stable according to the required value of the test condition; stop dust injection when the test duration reaches the set value of the test condition, and keep The test box is closed, allowing the dust to settle freely for 4 hours;
（4）对经上述粉尘试验的火灾探测器进行测量：采用现场定量检测设备在试验箱体内测量火灾探测器的响应阈值；记录发生误报的时间和次数；(4) Measure the fire detectors that have passed the above dust test: use on-site quantitative testing equipment to measure the response threshold of the fire detectors in the test chamber; record the time and times of false alarms;
（5）分别计算出两个火灾探测器试验前和试验后的响应阈值比，两个阈值比均不大于1.6、且试验过程中两个火灾探测器均未发出报警信号和故障信号，则判定该火灾探测器在试验条件下其性能受粉尘长期累积影响试验合格。(5) Calculate the response threshold ratios of the two fire detectors before and after the test respectively, if the two threshold ratios are not greater than 1.6, and neither of the two fire detectors sends out alarm signals or fault signals during the test, then it is determined Under the test conditions, the performance of the fire detector is affected by the long-term accumulation of dust and passed the test.
火灾探测器抗粉尘短时间干扰能力试验方法，包括以下步骤：The fire detector anti-dust short-term interference test method includes the following steps:
（1）设定试验条件：根据火灾探测器实际使用环境空气粉尘情况，通过调查和统计确定粉尘间歇注入方式和注入粉尘的浓度；悬浮尘组成及粒径分布以A2尘为主；对粉尘浓度进行连续检测和控制；温度为正常实验室温度；相对湿度≤25%；通过接地克服静电积累；根据试验的严酷程度要求和粉尘浓度设定试验持续时间；(1) Set the test conditions: According to the actual use of the fire detector in the ambient air dust situation, determine the intermittent dust injection mode and the concentration of the injected dust through investigation and statistics; the composition and particle size distribution of the suspended dust are mainly A2 dust; the dust concentration Carry out continuous detection and control; temperature is normal laboratory temperature; relative humidity ≤ 25%; overcome static electricity accumulation by grounding; set the test duration according to the severity requirements of the test and the dust concentration;
（2）对火灾探测器进行粉尘试验前的初始测量：取两个火灾探测器样品，将一个设置为最高灵敏度，另一个设置为最低灵敏度，分别测量其响应阈值，并作记录；(2) Initial measurement before the dust test of the fire detector: take two fire detector samples, set one as the highest sensitivity and the other as the lowest sensitivity, measure their response thresholds respectively, and make records;
（3）将上述经过初始测量的两个火灾探测器样品安装在所述火灾探测器粉尘试验装置的试验箱体内的火灾探测器安装架上，通电稳定运行两小时后开始进行粉尘试验：给电热丝通电，使试验箱体内温度和相对湿度达到试验条件要求；调节含尘压缩空气的压力和流量，使粉尘按试验条件设定的浓度和间歇注入方式从试验箱体底部的喷嘴中向试验箱体内注入，试验箱体内气压与外部大气压基本一致，通过粉尘浓度计对粉尘浓度进行连续监测，并通过人工闭环控制，使粉尘浓度稳定在试验条件设定值；待试验持续时间达到试验条件设定值时停止粉尘注入，保持试验箱体关闭状态，使粉尘自由沉降4小时；(3) Install the above-mentioned two fire detector samples that have undergone initial measurement on the fire detector mounting frame in the test box of the fire detector dust test device, and start the dust test after two hours of stable operation with power on: The wire is energized to make the temperature and relative humidity in the test box meet the requirements of the test conditions; adjust the pressure and flow of dust-laden compressed air to make the dust flow from the nozzle at the bottom of the test box to the test box according to the concentration and intermittent injection method set by the test conditions. Injection in the body, the air pressure in the test box is basically the same as the external atmospheric pressure, the dust concentration is continuously monitored by the dust concentration meter, and the dust concentration is stabilized at the set value of the test condition through manual closed-loop control; the test duration is to reach the test condition setting When the value is reached, stop the dust injection, keep the test box closed, and allow the dust to settle freely for 4 hours;
（4）记录火灾探测器报警和报故障的时间和次数，火灾探测器在试验过程中如未发出报警，也未发生不可恢复的故障信号，则判定该火灾探测器灵敏度在试验条件下抗粉尘短时间干扰能力试验合格。(4) Record the time and times of the fire detector alarm and failure report. If the fire detector does not issue an alarm or an unrecoverable failure signal during the test, it is judged that the fire detector sensitivity is resistant to dust under the test conditions. Passed the short-term interference ability test.
本发明的有益效果：Beneficial effects of the present invention:
利用本发明试验装置和试验方法可对点型感烟火灾探测器性能受粉尘累积影响和抗粉尘短时间干扰能力进行定量测试，从而为正确评价火灾探测器抗粉尘能力提供可靠依据，解决了目前国内外对点型感烟火灾探测器抗短时粉尘干扰和长期粉尘累积影响无正确评价方法的技术问题，为火灾探测器的应用、研究开发和性能改进创造了有利条件。The test device and test method of the present invention can be used to quantitatively test the performance of point-type smoke fire detectors affected by dust accumulation and the ability to resist short-term dust interference, thereby providing a reliable basis for correctly evaluating the dust resistance of fire detectors and solving the current problem. There is no correct evaluation method for the short-term dust interference and long-term dust accumulation effect of point-type smoke fire detectors at home and abroad, which creates favorable conditions for the application, research and development and performance improvement of fire detectors.
附图说明Description of drawings
图1为本发明火灾探测器试验装置的结构和使用原理框图；Fig. 1 is the structure of the fire detector test device of the present invention and the principle block diagram of use;
图2为图1中试验箱体的结构示意图。Fig. 2 is a schematic structural diagram of the test box in Fig. 1 .
图中：1-上盖，2-试验箱体，3-引管。4-火灾探测器安装架，5-观察窗，6-粉尘浓度计连接法兰，7-喷嘴。8-走轮，9-进气管，10-温湿度计连接法兰，11-气压表连接法兰。In the figure: 1-top cover, 2-test box, 3-leading tube. 4-fire detector mounting frame, 5-observation window, 6-dust concentration meter connecting flange, 7-nozzle. 8-travel wheel, 9-intake pipe, 10-thermo-hygrometer connection flange, 11-barometer connection flange.
具体实施方式Detailed ways
以下结合附图和实施例对本发明作进一步说明。The present invention will be further described below in conjunction with drawings and embodiments.
如图1所示，本发明火灾探测器粉尘试验装置由试验箱体、与试验箱体相连接的粉尘源和试验参数监控装置三部分组成，使用时将被测火灾探测器置于试验箱体内。如图2所示，试验箱体2为圆柱形，直径100mm，高150mm，由2mm厚钢板制成，在试验箱体的上端盖1的中心焊接一内径10mm、长50mm的引管3（可采用钢管），用于将被测火灾探测器的电源线和信号线从试验箱体内引出，与火灾探测器的控制和显示设备相接；引管3的下端焊接圆盘形火灾探测器安装架4，试验时，被测火灾探测器可通过螺栓安装在该安装架上；在对应火灾探测器安装架的试验箱体的箱壁上开设一个由透明有机玻璃构成的方形观察窗5，用以试验时观察试验箱体内被测火灾探测器运行情况和粉尘状态；试验箱体2底部做成向上的喇叭口形，其中心设置喷嘴7，喷嘴通过由Φ8mm铜管构成的进气管9与粉尘源相接；试验参数监控装置包括粉尘浓度计、温湿度计、气压表和电热丝（图中未显示），其中粉尘浓度计、温湿度计和气压表分别通过安装在试验箱体箱壁上的粉尘浓度计连接法兰6（采用DN50法兰）、温湿度计连接法兰10（直径Φ10mm）和气压表连接法兰11（直径Φ10mm）与试验箱体相接；将电热丝通过绝缘护套缠绕在试验箱体的外壁上，并加以固定；试验箱体底面对称安装四个走轮8，用以移动试验箱体。As shown in Figure 1, the fire detector dust test device of the present invention is composed of three parts: a test box, a dust source connected to the test box, and a test parameter monitoring device. When in use, the fire detector to be tested is placed in the test box . As shown in Figure 2, the test box body 2 is cylindrical, with a diameter of 100 mm and a height of 150 mm. It is made of a 2 mm thick steel plate, and a
实施例1Example 1
利用上述火灾探测器试验装置，根据本发明试验方法，对用于某宾馆客房的某型号点型感烟火灾探测器性能受粉尘长期累积影响按以下步骤进行试验：Using the above-mentioned fire detector test device, according to the test method of the present invention, the performance of a certain type of point-type smoke fire detector used in a certain hotel room is tested by the long-term accumulation of dust according to the following steps:
（1）设定试验条件：根据对该宾馆客房粉尘状况的调查和统计确定试验粉尘浓度为0.3mg/m3；试验用粉尘源采用旋转式微量粉尘发生装置（由ZL200620093887.4号专利公开）形成，浮尘粒径分布以A2尘为主；试验箱体内悬浮尘要保持均匀；温度25℃；相对湿度25%；通过接地克服静电积累；试验持续时间为3天；(1) Set the test conditions: According to the investigation and statistics of the dust situation in the hotel room, the test dust concentration is determined to be 0.3mg/m3 ; the dust source used in the test adopts a rotating micro-dust generator (disclosed by patent No. ZL200620093887.4) Formation, the particle size distribution of floating dust is mainly A2 dust; the suspended dust in the test box should be kept uniform; the temperature is 25°C; the relative humidity is 25%; the static electricity accumulation is overcome by grounding; the test duration is 3 days;
（2）对火灾探测器进行粉尘试验前的初始测量：取试验型号火灾探测器样品两个，将其中一个灵敏度设置为最高值，另一个灵敏度设置为最低值，测量其响应阈值分别为0.31和0.52，将其记录；(2) Initial measurement before the dust test of the fire detector: Take two samples of the fire detector of the test model, set the sensitivity of one to the highest value and the sensitivity of the other to the lowest value, and measure the response thresholds of 0.31 and 0.31 respectively. 0.52, record it;
（3）将上述经过初始测量的两火灾探测器样品用螺栓安装在上述试验装置试验箱体内的火灾探测器安装架上，通电稳定运行两小时后开始进行粉尘试验：给电热丝通电，调节试验箱体内温度在25~35℃之间；相对湿度25%；调节含尘压缩空气的压力和流量，使粉尘从试验箱体底部的喷嘴中向试验箱内均匀注入，试验箱内气压与外部大气压基本一致，通过粉尘浓度计随时监视试验箱体内粉尘浓度值，通过人工闭环控制，使粉尘浓度在0.3mg/m3条件下保持稳定，试验持续时间达到3天后停止粉尘注入，保持试验箱关闭状态，使粉尘自由沉降4小时；(3) Install the above-mentioned two fire detector samples that have been initially measured on the fire detector mounting frame in the test box of the above-mentioned test device with bolts, and start the dust test after two hours of stable operation with power on: power on the heating wire, adjust the test The temperature in the chamber is between 25 and 35°C; the relative humidity is 25%; adjust the pressure and flow of dust-laden compressed air so that the dust is evenly injected into the chamber from the nozzle at the bottom of the chamber, and the air pressure in the chamber is the same as the external atmospheric pressure. Basically the same, the dust concentration in the test box is monitored at any time through the dust concentration meter, and the dust concentration is kept stable at 0.3mg/m3 through manual closed-loop control. After the test duration reaches 3 days, stop dust injection and keep the test box closed. , allowing the dust to settle freely for 4 hours;
（4）对经上述粉尘试验的火灾探测器进行阈值检测：利用英国NoClimb公司TureTest点型感烟火灾探测器阈值检测设备检测两个火灾探测器的响应阈值分别为0.23和0.42，将其分别与初始响应阈值0.31和0.52比较，响应阈值比（初始阈值与试验后阈值比）分别为1.35和1.24，均小于试验要求值1.6；且试验过程中两火灾探测器未发出报警信号和故障信号。由此判定该型号点型感烟火灾探测器性能受粉尘长期累积影响试验合格。(4) Threshold detection of the fire detectors that have passed the above dust test: use the British NoClimb company TrueTest point-type smoke fire detector threshold detection equipment to detect that the response thresholds of the two fire detectors are 0.23 and 0.42 respectively, and compare them with Compared with the initial response threshold of 0.31 and 0.52, the response threshold ratio (ratio of the initial threshold to the post-test threshold) is 1.35 and 1.24 respectively, both of which are lower than the test requirement value of 1.6; and the two fire detectors did not send out alarm signals or failure signals during the test. Therefore, it is judged that the performance of this type of point-type smoke fire detector is affected by the long-term accumulation of dust, and the test is qualified.
实施例2Example 2
利用上述火灾探测器试验装置，根据本发明试验方法，对用于某宾馆前厅的某型号点型感烟火灾探测器抗粉尘短时间干扰能力按以下步骤进行粉尘试验：Utilize the above-mentioned fire detector test device, according to the test method of the present invention, carry out the dust test according to the following steps on the anti-dust short-term interference ability of a certain type of point-type smoke fire detector used in the lobby of a certain hotel:
（1）设定试验条件：采用粉尘间歇注入方式，根据对类似环境空气粉尘情况的调查和统计，设定每相隔30分钟注入浓度为0.5mg/m3的试验粉尘30秒钟；粉尘的组成及粒径分布与实施例1相同；试验箱体内温度为25~35℃；相对湿度不大于25%；通过接地克服静电积累；试验持续时间为2小时；(1) Set the test conditions: adopt the dust intermittent injection method, according to the investigation and statistics of similar ambient air dust conditions, set the test dust with a concentration of 0.5mg/m3 for 30 seconds every 30 minutes; the composition of the dust And the particle size distribution is the same as in Example 1; the temperature in the test box is 25 ~ 35 ° C; the relative humidity is not more than 25%; the accumulation of static electricity is overcome by grounding; the test duration is 2 hours;
（2）对火灾探测器进行粉尘试验前的初始测量：取试验型号火灾探测器样品两个，将其中一个设置为最高灵敏度，另一个设置为最低灵敏度，测得其响应阈值分别为0.27和0.51；并作记录；(2) Initial measurement before the dust test of the fire detector: Take two samples of the fire detector of the test model, set one of them as the highest sensitivity and the other as the lowest sensitivity, and the measured response thresholds are 0.27 and 0.51 respectively ; and make a record;
（3）将上述经过初始测量的两个火灾探测器样品安装在试验装置试验箱体内的火灾探测器安装架上，通电稳定运行两小时后开始进行粉尘试验：给电热丝通电，使试验箱体内温度达到25~35℃，相对湿度不大于25%，通过电磁阀控制含尘压缩空气从试验箱体底部的喷嘴中每隔30分钟向试验箱内喷入浓度为0.5mg/m3的含尘气流，时间30秒，通过粉尘浓度计连续检测喷入试验箱体内粉尘的浓度值；试验箱内气压与外部大气压保持一致，连续5个循环后停止粉尘注入，保持试验箱关闭，使粉尘自由沉降4小时；(3) Install the above-mentioned two fire detector samples that have undergone initial measurement on the fire detector mounting frame in the test box of the test device, and start the dust test after two hours of stable operation with power on: energize the heating wire to make the test box The temperature reaches 25~35°C, the relative humidity is not more than 25%, and the dust-laden compressed air is controlled by the solenoid valve to spray dust with a concentration of 0.5mg/m3 into the test chamber every 30 minutes from the nozzle at the bottom of the test chamber. Air flow, time 30 seconds, continuously detect the concentration value of the dust sprayed into the test chamber through the dust concentration meter; the air pressure in the test chamber is consistent with the external atmospheric pressure, stop the dust injection after 5 consecutive cycles, keep the test chamber closed, and allow the dust to settle freely 4 hours;
（4）高灵敏度火灾探测器发出报警信号，低灵敏度火灾探测器正常工作，两只火灾探测器均未报故障，由此判定该型号火灾探测器在试验条件下高灵敏度抗粉尘短时间干扰能力试验不合格；低灵敏度抗粉尘短时间干扰能力试验合格。(4) The high-sensitivity fire detector sends out an alarm signal, the low-sensitivity fire detector works normally, and neither of the two fire detectors reports a failure, thus judging the high-sensitivity anti-dust short-term interference ability of this type of fire detector under the test conditions The test failed; the low-sensitivity anti-dust short-term interference ability test passed.
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| CN106935005B (en)* | 2017-05-09 | 2022-06-28 | 应急管理部沈阳消防研究所 | Test device and method for evaluating dust transient interference resistance of smoke detector |
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