우수한성능 높은가용성 FT702LT 초음파풍향풍속계는가혹한환경에서도견딜수있는견고성이우수한풍향풍속센서를설계해온 FT Technologies 사의 10 여년간경험의산물입니다. 초음파작동원리에기반을두고있어기존의센서가작동하지못하는혹독한환경에서도 99.9% 이상의데이터가용성을자

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1 FT702LT 초음파헤비듀티풍향풍속센서 풍향및풍속 견고한일체형센서 FT702LT 시리즈

2 우수한성능 높은가용성 FT702LT 초음파풍향풍속계는가혹한환경에서도견딜수있는견고성이우수한풍향풍속센서를설계해온 FT Technologies 사의 10 여년간경험의산물입니다. 초음파작동원리에기반을두고있어기존의센서가작동하지못하는혹독한환경에서도 99.9% 이상의데이터가용성을자랑합니다. 설계시부터초가속수명시험을통하여높은가용성을보장하고, 광범위한별도의시험프로그램을거쳐, 수명저하를유발하는움직이는부품이없는견고한고체기반센서의설계가이루어집니다. FT702 풍향풍속센서제품군은전세계에서아마도가장많이테스트된센서기술일것입니다. 모래, 먼지, 착빙, 진동, 추락, 침식, 우박및번개보호등과같은 28 개의독립적인증테스트를통과하였습니다. FT702LT 센서는본사의 Acu-Res 특허기술로구동되어다년간신뢰성을보장해드립니다. 모든센서는출고전완벽한검사를거치고자체윈드터널에서 100% 보정되므로긴수명과신뢰성이보장됩니다. 강력한착빙방지기능센서에자동온도조절식히팅시스템이장착되어센서바디전체의온도를유지합니다. 또한 0⁰C 에서 55⁰C 사이에사용자가지정하는온도를유지합니다. 3 개의지능형소프트웨어제어히터기를사용하여센서전체에걸쳐일정한온도분포를유지합니다. 표준상태작동시히터소모전력은 99W 입니다. 극한환경에서는 ( 전원장치및케이블이허용하는한도에서 ) 0.1 에서 6 암페어까지전류한계를조절할수있습니다. 히터를정지시킬수있으며이경우소모전력은 25mA 로떨어집니다. 안전한번개보호기능풍향풍속계는정전기방출및낙뢰의영향으로전자기간섭에많이노출되기도합니다. FT702LT 초음파풍향풍속센서는견고한보호회로를내장하여이러한환경에노출되어도아무런문제가없습니다. 4kA 8/20μs 이상의비손상번개발생서지에도정상적으로작동합니다. 다양한설치옵션 FT702LT 시리즈에는두가지종류의설치옵션이있습니다. 평면선단마운트옵션을사용하여금속대에설치할수도있고파이프마운트시스템을사용하여파이프에설치할수도있습니다. 파이프시스템을사용하는경우파이프내부에통신선과전력선을통과시켜외부환경으로부터안전하게보호할수있는장점이있습니다. 전천후환경사용 FT702LT 센서시리즈는지난 10 여년동안몽골부터알래스카까지전세계에걸쳐 65,000 개이상이사용되어왔습니다. 기상장비, 윈드터빈, 건물, 철도및군사용차량등에설치되어사용되고있으며남극과북극에서도사용되고있습니다. 파이프마운트시스템

3 품질보장 환경보호시스템 Acu-Res EPS 를사용하여어떠한외부환경에서도데이터의가용성이보장되도록설계되었습니다. EPS 는다음과같이구성됩니다. 시작 8 개의센서를선택하여개별적인보정을거친후다음과같은가속수명시험을수행하였습니다. 견고성및소형경량체구조내성 : 충격 시험방법및결과 : 추락내성 : EN (2008) 콘크리트바닥에 1 미터높이에서각각다른각도로 6 번낙하. 시험방법및결과 : 우박내성 : EN (2005) 23 m/s 의속도로 7.5 그램무게의우박 10 개충돌. 고경도양극산화합금바디내성 : 염분, 모래및수분 시험방법및결과 : 내식성 : ISO 9227 (2006) 및 IEC12944(1998) 1440 시간동안중성염분무를통한 C5M 클래스부식시험. 시험방법및결과 : 모래및먼지내성 : DEF STAN CL25 (2006) 공기속도 29 m/s 및농도 1.1g/m3 조건에서모래입자 3 시간및먼지입자 3 시간시험. 3 개의히터 : 완벽한온도조절내성 : 동계가혹기후 시험방법및결과 : MIL-STD-810G 내빙 : 15m/s 의풍속및 -14 C 의저온조건의저온실에서진눈깨비시험을거침. 센서정상작동확인. 태양방사선 55 C 에서 1120 W/m2 의 UV 방사선 24 시간시험. 통과 : EN (2000) 고도해발 3000 미터에상당하는저압에서 4 시간시험. 부가적인저압. 윈드터널시험에서 4000 미터까지정상적으로작동함. 통과 : EN (1999) 극한온도 -40 C 에서 16 시간노출. +85 C ( 건열 ) 에서 16 시간시험. -40 C 에서 +70 C 까지의 16 주기에서 74 시간시험. 통과 : EN (2007), EN (2007), EN (2009) 3 축정현파및무작위진동 Hz, 1 octave/min 정현파 Hz, 축당 90 분, g2/Hz 의무작위조건. 통과 : EN (2008), EN (2008) 방수및먼지내성먼지시험기에서 8 시간시험. 1 미터깊이물속에서 30 분시험. 통과 : EN (2000) - IP67 인증 시험방법및결과 : MIL-STD-810G 방빙 : 15m/s 의풍속및 -14 C 의저온조건에서 45mm 의착빙. 조건변화없이히터작동시 15 분내방빙확인. 서지보호전자장치내성 : 번개 시험방법및결과 : > 산업환경내성시험 EN > 정전기방전내성시험 EN > 전기적급속과도현상 / 버스트내성시험 EN > 서지내성시험 EN > 펄스자기장내성시험 EN > 직류전원의전압강하순간정전및전압변화내성시험 EN 부가적 EMC 시험및상세정보를제공해드릴수있습니다. 정적습도및반복습윤정적상대습도 : 240 시간 +93%. 매 24 시간 6 번반복, 최고온도 55 C. 통과 : EN (2002), EN (2005) 안개및강우 1-2 ml/80cm2 의안개강도에서 1 시간시험. 200 ±50 mm 의강우에서 1 시간시험. 통과 : DEF STAN Test CL26, DEF STAN Test CL27 위의시험을거친 8 개의센서는시험후에도성능에변함이없음이확인되었습니다. 종료

4 기술 Acu-Res 는 FT Technologies 사의음향공진특허기술입니다. 작은공동을이용하여정밀한측정이가능하므로센서의소형경량화가가능하고열전달이우수하며내구성과견고성이뛰어납니다. 따라서기계적방식의센서나타사의초음파풍향풍속센서와는차별화된, 전천후환경에서믿고사용할수있는측정솔루션을제공해드립니다. 센서는측정공동내부의초음파신호공진에그작동원리를두고있습니다. 공기가공동을지나가며발생하는초음파신호의위상차를측정함으로써공기흐름을감지합니다. 센서내부에는 3 개의변환기가정삼각형형태로각각상부반사판및하부반사판에설치되어있습니다. 송신변환기및수신변환기짝간의실제위상의차이로변환기짝의축방향공기흐름에대한정보를알아내고, 3 짝을모두측정하게되면변환기에의해형성되는삼각형의각변방향으로의공기흐름의성분벡터를결정할수있습니다. 이러한성분벡터들을합치면전체속도와방향을알수있습니다. 이러한계산을위해각측정단계마다복잡한신호처리및데이터분석을사용하고있습니다. 1. 변환기가측정공동에초음파신호를송신하여공진이발생합니다. 변환기가초음파를송신한다 2. 공진을위해송신신호의파장을공동내부의음향공진파장과일치시킵니다. 신호가공동에서공진한다 3. 음속변화에따른공진신호성질의변화를자동적으로감지하여디지털프로세싱엔진으로보정하게됩니다. 두번째변환기가수신한다 4. 송신된신호가수신변환기에도달하지않는경우에는자동적으로에러가감지되어사용자에게알려집니다. 공동의신호품질을평가한다 5. 초음파신호의주파수를항상조절하여공진을유지시키므로센서가다양한환경에서도정상적으로작동합니다. 초음파특성을선택한다 Hz 센서에는온도, 압력및습도변화에대한원천적보정기능이내장되어있습니다. 작은공간에서강력한음향공진이유지되므로신호강도가좋아측정이용이합니다. Acu-Res 는다른초음파기술에비해 40db 이상강한신호대잡음비를제공합니다. ACU-RES 는날씨에관계없이항상정상적으로작동합니다

5 사양 풍속 범위해상도정확도 0-50m/s 0.1m/s ±0.5m/s (0-15m/s) ±4% (>15m/s) 풍향범위 0 to 360 해상도 1 정확도 ±2 (±10 기준점내외 ) ±4 (±10 기준점이상 ) 센서성능 측정원리 음향공진 ( 온도, 압력및습도변화에대한자동보정 ) 측정단위 초당미터, 시간당킬로미터혹은노트 고도 m 작동범위 온도범위 -40 부터 +85 C ( 작동및보관 ) 습도 0-100% 침투보호 IP67, EN (1992) 히터설정 0 부터 55 C. 히터작동시작점을설정할수있음. 전력조건 공급전압 20V부터 30V DC (24V DC 공칭전압 ) 공급전류 ( 히터비사용시 ) 25mA 공급전류 ( 히터사용시 ) 4A ( 기본내정값 ), 6A ( 최고 ) 로제한 소프트웨어를통해0.1A씩변경가능. 히터전력소모는 센서온도를사용자설정온도로맞추는데필요한에너지에따라달라짐. 히터및센서소모 전력기본값은 99W로제한됨. 안전 UL 안전규격 및 CSAC22.2 No 전기안전표준에부합되는공인부품인증 물리적외관 센서무게 320g ( 최대 ) I/O 커넥터 5핀 (RS485 옵션 ), 8핀 (4-20mA 옵션 ) 다극커넥터. 디지털센서 인터페이스 RS485, 전력공급장치와케이스로부터전기적으로분리되어있음. 형식 ASCII 데이터, 폴링혹은연속적출력모드, NMEA 데이터업데이트속도 초당 5 번측정. 아날로그센서 0-180km/h knots 0.1km/h 0.1knots ±1.8km/h (0-54km/h) ±1knot (0-29knots) ±4% (>54km/h) ±4% (>29knots) 인터페이스 4-20mA, 전력공급장치와케이스로부터전기적으로분리되어있음. 형식풍속용 4-20mA 전류루프 1개 ( 다른비례인자가능 ). 풍향용 4-20mA전류루프 1개 ( 기준값 4mA나 12mA로설정가능 ). 풍속및풍향아날로그채널은모두초당 5번씩업데이트됨. 4-20mA 설정포트아날로그센서의내부세팅을변경시키거나진단시험을하는데사용됨. 데이터로거나기타장비에영구적으로연결하는목적으로사용하지마십시오. EMC 및환경시험 FT702LT 는부식, 착빙, 방빙, 충격, 우박, 추락, ESD, 단락및전력중단과같은 28 개의개별적환경시험을통과하여인증을받았습니다. 시험에대한자세한정보및시험보고서전문을제공해드릴수있으며또한본사웹사이트를통해서도볼수있습니다.

6 제품군 단위는모두 mm 입니다 디지털센서아날로그센서 평면선단 (FF) FT702LT-V22-FF FT702LT/D-V22-FF 파이프마운트 (PM) FT702LT-V22-PM FT702LT/D-V22-PM Acu-Test 평가팩평가팩에는 Acu-Vis 소프트웨어와함께윈도우 PC 및전력공급장치연결용특별제작케이블이제공됩니다. 아날로그센서의경우소프트웨어를통해센서작동을확인하고기본값을변경할수있습니다. 디지털센서의경우센서세팅값을표시하고실시간으로풍속및풍향값을표시하여주는기능이있습니다. FT089 파이프마운트어댑터파이프마운트시스템을사용하면풍향풍속센서를손쉽고안전하게파이프에설치할수있습니다. 또한접지향상및부가적인환경보호와전자기보호와같은장점도있습니다. 센서는탈착될수있으며재장착시별도의재정렬이필요없습니다. 파이프마운트시스템은완제품이나생산라이선스와함께설계도로도판매됩니다. 연락처 : 전화 : +44 (0) 팩스 : +44 (0) sales@fttech.co.uk FT Technologies Church Lane Teddington TW11 8PA England FT 와 Acu-Res 로고및 Acu-Res 명은 FT Technologies Ltd 사의등록상표입니다. FT Technologies Ltd 사가제공하는정보는정확하며신뢰할수있습니다. 그러나그사용에대해서는 FT Technologies Ltd 사는책임이면제됩니다. 또한이로인해발생될수있는제삼자의권리혹은특허침해에도책임이면제됩니다. FT Technologies Ltd 사는본사의특허권하에서어떠한명시적또는묵시적권리도부여하지않습니다. 1A4236

7 FT702LT U L T R A S O N I C HEAVY DUTY W I N D S E N S O R WIND SPEED AND WIND DIRECTION IN ONE TOUGH PACKAGE FT702LT series

8 Proven High Availability The FT702LT ultrasonic anemometer is the result of FT Technologies 10 years of experience in designing durable wind sensors for demanding environments. Users typically experience data availability of more than 99.9% as the ultrasonic anemometer keeps on working in many adverse environments where traditional sensors fail. These high levels of availability are achieved through the use of Highly Accelerated Lifecycle Testing during design, an extensive independent testing programme and a robust solid state design with no moving parts to degrade. The sensor is probably the most tested wind sensor in the world. It has passed over 28 independent tests including sand, dust, ice, vibration, drop, corrosion, hail and lightning protection. Powered by our patented Acu-Res technology the FT702LT delivers reliable measurements for many years. All our sensors are 100% wind tunnel checked before dispatch to ensure that the sensors will give long and reliable service. Powerful De-Icing The sensor is fitted with a thermostatically controlled all-body heating system. The sensor maintains its temperature at a user specified heater set point of between 0⁰C and 55⁰C. Three software controlled heaters are used to distribute heat intelligently over the entire sensor. In standard format the heaters draw a maximum of 99W. For extreme environments the current limit can be adjusted (power supply and cabling permitting) from 0.1 to 6 Amps. The heaters can also be switched off and then current draw falls to 25mA. Proven Lightning Protection Wind sensors may be exposed to high levels of electromagnetic interference from static discharges and nearby lightning strikes. The sonic FT702LT incorporates robust protection circuitry to shield it against these effects. The sensor will survive undamaged lightning induced surges in excess of 4kA 8/20μs. Installation Flexibility The FT702LT series has two physical mounting options. The flat front mounting for fitment to a bar or the pipe mount system for fitment to a pipe. The pipe mount system gives improved environmental protection as the communication and power cable is kept fully protected inside the pipe. Used Everywhere The FT702LT series has been in use for over 10 years. In that time more than 65,000 sensors have been installed all over the world from Mongolia to Alaska. The sensor is used in meteorology, on wind turbines, on buildings, on railways, on armoured vehicles and at both of the Poles. PIPE MOUNT SYSTEM

9 Reliable Environmental Protection System The Acu-Res EPS means the sensor works reliably in the most extreme conditions and helps to guarantee high data availability. The EPS incorporates: drop hail corrosion sand/dust freezing rain Robust, compact form Designed for: Impact Tested and Proven: Drop resistant: EN (2008) dropped 6 times at different angles from 1 metre onto steel faced concrete. Tested and Proven: Hail resistant: EN (2005) 10 hail stones, 7.5 grams each shot at the sensor at 23 m/s. Hard anodised alloy body Designed for: Salt, sand and water Tested and Proven: Corrosion resistant: ISO 9227 (2006) & IEC12944 (1998) corrosion class C5M High corrosion test in Neutral salt spray atmosphere for 1440 hours. Tested and Proven: Sand and Dust resistant: DEF STAN CL25 (2006) sand particles for 3 hours and dust particles for 3 hours, at 29 m/s air velocity, concentration 1.1g/m3. Three heaters: total temperature control Designed for: Harsh winters Tested and Proven: Ice resistant MIL-STD-810G: Sensor remains ice free when freezing rain applied in a chamber with temperature -14 C wind speed 15m/s. Eight sensors were independently calibrated prior to the following accelerated life tests. radiation altitude +85 C -40 operation vibration IP 67 ingress Start Solar Radiation 24 hours of UV radiation with an ambient temperature of 55 C, irradiance of 1120 W/m2. Passed: EN (2000) Altitude 4 hours at a constant low pressure typical to 3000 metres above sea level. Additional tests in a dedicated altitude wind tunnel have shown that the sensor measures accurately up to 4000m Passed: EN (1999) Heat and Cold 16 hours of cold air at -40 C. 16 hours dry heat at +85 C. 74 hours of heat and cold, 16 temperature cycles from -40 C to +70 C. Passed: EN (2007), EN (2007), EN (2009) 3 axis Sinusoidal & Random Vibration Hz, 1 octave/min sweep range for sinusoidal Hz, 90 mins per axis, g2/Hz for random. Passed: EN (2008), EN (2008) Water and Dust Protection Exposed to a dust chamber for 8 hours. Submerged in 1 metre depth of water for 30 mins. Passed: EN (2000) - Sealed to IP67 ice Tested and Proven: De-icing MIL-STD-810G: Sensor exposed to freezing rain in air flow of 15m/s and -14 C. Ice built up to 45mm. Heaters switched on. Airflow and temperature unchanged. The sensor was ice free in under 15 minutes. % 100% 0% humidity Stationary & Cyclic Humidity Stationary relative humidity +93% for 240 hours. Six 24 hour cycles, upper temperature 55 C. Passed: EN (2002), EN (2005) lightning Surge protection electronics Designed for: Lightning Tested and Proven: > Immunity for industrial environments EN > Electrostatic discharge immunity test EN > Electrical fast transient/burst immunity test EN > Surge immunity test EN > Pulse magnetic field immunity test EN > Voltage dips, short interruptions and voltage variations on d.c. input power port immunity tests EN Additional EMC tests and full details available on request. rain Fog and Rain Fog intensity of 1 to 2 ml/80cm2 for 1 hour. Rain at 200 ±50 mm for 1 hour. Passed: DEF STAN Test CL26, DEF STAN Test CL27 The eight sensors were checked again after the tests and their performance was unchanged. Finish

10 Technology This is FT Technologies patented Acoustic Resonance technology. Acu-Res enables our sensors to take accurate measurements in a small space. This means our sensors are small, easy to heat, durable and strong. Acu-Res sets FT sensors apart from mechanical and other ultrasonic wind sensing technologies to give a more robust and reliable measurement solution. The sensor works by creating a resonating ultrasonic signal inside the sensor s measurement cavity. The motion of air is sensed by measuring the phase change in the ultrasonic signal caused by the wind as it passes through the cavity. The sensor has three transducers arranged in an equilateral triangle. The net phase difference between a transmitting and receiving transducer pair is indicative of the airflow along the axis of the pair and by measuring all three pairs the component vectors of the airflow along the sides of the triangle are determined. These vectors are combined to give the overall speed and direction. The sensor uses complex signal processing and data analysis taking a sequence of multiple measurements to calculate regular wind readings. 1. Resonance is initiated by a transducer transmitting an ultrasonic signal into the measurement cavity. Transducer transmits ultrasound 2. In order to achieve resonance, the wavelength of the transmitted signal is made to match the resonance wavelength of sound inside the cavity. Signal resonates in cavity 3. Changes in the properties of the resonating signal caused by a change in the speed of sound are automatically detected and corrected by the digital processing engine. 2nd transducer receives 4. If for some reason the signal fails to arrive at the receiving transducers, the failure is detected automatically and an error flag is generated to alert the user. Signal quality in cavity assessed 5. The frequency of the ultrasonic signal is constantly adjusted so the sensor maintains resonance in varying operating environments. Ultrasound properties selected Hz The sensor inherently compensates for changes in the air s temperature, pressure or humidity. A strong resonating sound wave in a small space provides a large signal that is easy to measure. Acu-Res has a signal to noise ratio more than 40db stronger than other ultrasonic technologies. ACU-RES KEEPS WORKING REGARDLESS OF THE WEATHER

11 Specification Wind speed Range Resolution Accuracy 0-50m/s 0.1m/s ±0.5m/s (0-15m/s) ±4% (>15m/s) Wind direction Range 0 to 360 Resolution 1 Accuracy Sensor performance ±2 (within ±10 datum) ±4 (beyond ±10 datum) 0-180km/h knots 0.1km/h 0.1knots ±1.8km/h (0-54km/h) ±1knot (0-29knots) ±4% (>54km/h) ±4% (>29knots) Measurement principle Acoustic Resonance (automatically compensates for variations in temperature, pressure & humidity). Units of measure metres per second, kilometres per hour or knots Altitude m operating range Temperature range -40 to +85 C (operating and storage) Humidity 0-100% Ingress protection IP67, EN (1992) Heater settings 0 to 55 C. The heater set point can be configured. Power requirements Supply voltage Supply current (heater off ) Supply current (heater on) Safety Physical Sensor weight I/O connector 20V to 30V DC (24V DC nominal) 25mA Limited to 4A (default), 6A (max) configurable in software in 0.1A increments. Heater power consumption will depend on the energy required to keep the sensor s temperature at the user determined set point. The heater and sensor power consumption is limited by default to 99W. Certified as Recognized Component to UL and CSA electrical safety standards 320g (max) 5-way (RS485 option), 8-way (4-20mA option) multipole connector. Digital Sensor Interface RS485, galvanically isolated from power supply lines and case. Format ASCII data, polled or continuous output modes, NMEA Data update rate 5 measurements per second. Analogue Sensor Interface Format 4-20mA configuration port 4-20mA, galvanically isolated from power supply lines and case. One 4-20mA current loop for wind speed (different scaling factors are available). One 4-20mA current loop for wind direction (datum value configurable as 4mA or 12mA). Both analogue channels are updated five times per second. This port is for the user to change the internal settings of analogue sensors and to perform diagnostic testing. This interface is not intended for permanent connection to a data logger or other device. EMC and Environmental Tests The FT702LT has 28 different environmental test certificates including Corrosion, Icing, De-Icing, Shock, Hail, Drop, ESD, short circuit, power interruption and EMC. Further test details and full test reports available on request or via our website.

12 Product Range All dimensions shown in mm Digital Sensors Analogue Sensors Flat Front (FF) FT702LT-V22-FF FT702LT/D-V22-FF Pipe Mount (PM) FT702LT-V22-PM FT702LT/D-V22-PM Acu-Test Packs These comprise Acu-Vis software and a specially developed cable which allows connection to a Windows PC and to a power supply. For the analogue sensor the software allows the functioning of the sensor to be checked and configuration changes to be made. For the digital sensor the software displays the sensor s settings and shows wind speed and direction in real time. FT089 Pipe Mount Adapter This enables the pipe mount version of the wind sensor to be easily and securely mounted on to a pipe. It gives improved grounding and additional environmental and electromagnetic protection. The design allows the sensor to be removed and re-fitted without the need for re-alignment. The adapter is available as a finished product or as a set of drawings with a licence to manufacture. Contact: Tel: +44 (0) Fax: +44 (0) sales@fttech.co.uk FT Technologies Church Lane Teddington TW11 8PA England The FT and Acu-Res logos and the Acu-Res name are registered trade marks of FT Technologies Ltd. Information furnished by FT Technologies Ltd is believed to be accurate and reliable. However, no responsibility is assumed by FT Technologies Ltd for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No licence is granted by implication or otherwise under any patent rights of FT Technologies Ltd. 1A4236

우수한성능 높은가용성 FT702LT 초음파풍향풍속계는가혹한환경에서도견딜수있는견고성이우수한풍향풍속센서를설계해온 FT Technologies 사의 10 여년간경험의산물입니다. 초음파작동원리에기반을두고있어기존의센서가작동하지못하는혹독한환경에서도 99.9% 이상의데이터가용성을자

우수한성능 높은가용성 FT702LT 초음파풍향풍속계는가혹한환경에서도견딜수있는견고성이우수한풍향풍속센서를설계해온 FT Technologies 사의 10 여년간경험의산물입니다. 초음파작동원리에기반을두고있어기존의센서가작동하지못하는혹독한환경에서도 99.9% 이상의데이터가용성을자 FT702LT 초음파헤비듀티풍향풍속센서 풍향및풍속 견고한일체형센서 FT702LT 시리즈 우수한성능 높은가용성 FT702LT 초음파풍향풍속계는가혹한환경에서도견딜수있는견고성이우수한풍향풍속센서를설계해온 FT Technologies 사의 10 여년간경험의산물입니다. 초음파작동원리에기반을두고있어기존의센서가작동하지못하는혹독한환경에서도 99.9% 이상의데이터가용성을자랑합니다.

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