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 | Cobra XRS 9645 15 Band Radar/Laser Detector with New DigiView Data Display |  |  | US $93.95 | 16d 21h 18m |
 | Cobra ESD-7100 9-Band LaserEye Radar Laser Detector w/ UltraBright Data Display | | | US $46.84 | 29d 5h 21m |
 | COBRA ULTRA BRIGHT DATA DISPLAY 360 RADAR LASER DETECTOR UNDETECTABLE BY SPECTRE | | | US $51.99 | 24d 9h 7m |
 | COBRA XRS 9645 15-BAND RADAR/LASER DETECTOR W/DATA DISPLAY DIGITAL COMPASS | | | US $137.49 | 24d 12h 20m |
 | Cobra 15-Band Radar/Laser Detector with Voice Alert and DigiView Data Display | | | US $137.01 | 20d 17h 1m |
 | Cobra 9-Band Radar/Laser Detector with UltraBright Data display | | | US $56.84 | 20d 17h |
 | Cobra Electronics 9 Band Extra Sensory Radar Laser Detector Bright Data Display | | | US $82.88 | 17d 11h 23m |
 | 9-Band Radar/Laser Detector with UltraBright Data display-COBRA | | | US $47.00 | 15d 31m |
 | Cobra 9-BAND RADAR/LASER DETECTOR WITH ULTRABRIGHT DATA DISPLAY | | | US $54.95 | 3d 7h 57m |
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 | COBRA 15-Band Radar/Laser Detector with Voice Alert and DigiView Data Display | | | US $149.95 | 9d 17h 37m |
 | COBRA 9-Band Radar/Laser Detector with UltraBright Data display | | | US $59.95 | 12d 11h 47m |
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Detector Data
How & where to get "Portable Fingerprint Detector"? And What price?
The portable USB Fingerprint Reader with built-in smart card to allow greater security for laptops and other mobile devices. The device carries a personal profile of the registered user and compares the data received on the reader for verification. If the two match, the device will send an authentication certificate to the computer to allow access by the user.
The fingerprint identification software is based on an algorithm developed by Technoimagia Co., Ltd. The algorithm utilizes a process known as "Minutia Processing" that reduces the fingerprint features. The actual plate that one's finger is placed on is coated and mounted by Dai Nippon Printing
http://search.ebay.com/search/search.dll?ht=1&from=R4&satitle=fingerprint&sacat=58058%26catref%3DC6
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| Cobra XRS 9645 15 Band Radar/Laser Detector with New DigiView Data Display | | | US $93.95 | 16d 21h 18m |
| Cobra ESD-7100 9-Band LaserEye Radar Laser Detector w/ UltraBright Data Display | | | US $46.84 | 29d 5h 21m |
| COBRA ULTRA BRIGHT DATA DISPLAY 360 RADAR LASER DETECTOR UNDETECTABLE BY SPECTRE | | | US $51.99 | 24d 9h 7m |
| COBRA XRS 9645 15-BAND RADAR/LASER DETECTOR W/DATA DISPLAY DIGITAL COMPASS | | | US $137.49 | 24d 12h 20m |
| Cobra 15-Band Radar/Laser Detector with Voice Alert and DigiView Data Display | | | US $137.01 | 20d 17h 1m |
| Cobra 9-Band Radar/Laser Detector with UltraBright Data display | | | US $56.84 | 20d 17h |
| Cobra Electronics 9 Band Extra Sensory Radar Laser Detector Bright Data Display | | | US $82.88 | 17d 11h 23m |
| 9-Band Radar/Laser Detector with UltraBright Data display-COBRA | | | US $47.00 | 15d 31m |
| Cobra 9-BAND RADAR/LASER DETECTOR WITH ULTRABRIGHT DATA DISPLAY | | | US $54.95 | 3d 7h 57m |
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| COBRA 15-Band Radar/Laser Detector with Voice Alert and DigiView Data Display | | | US $149.95 | 9d 17h 37m |
| COBRA 9-Band Radar/Laser Detector with UltraBright Data display | | | US $59.95 | 12d 11h 47m |
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| Cobra XRS 9645 15 Band Radar/Laser Detector with New DigiView Data Display | | | US $93.95 | 16d 21h 18m |
 | New GQ GMC-300 Nuclear Radiation Detector Data recorder Beta Gamma Ray detection | | | US $178.00 | 3d 6h 2m |
| Cobra ESD-7100 9-Band LaserEye Radar Laser Detector w/ UltraBright Data Display | | | US $46.84 | 29d 5h 21m |
 | KJB TDG028 Tele-Data Guard Tap Detector Privacy Module | | | US $16.75 | 21d 10h 10m |
 | DATA INSTRUMENTS 3SMC-BXQD4H-1 DETECTOR | | | US $250.00 | 27d 10h 5m |
| COBRA ULTRA BRIGHT DATA DISPLAY 360 RADAR LASER DETECTOR UNDETECTABLE BY SPECTRE | | | US $51.99 | 24d 9h 7m |
 | NEW DATA INSTRUMENTS SAFELY LIGHT CURTAIN DETECTOR LC12 | | | US $999.99 | 27d 2h 29m |
 | Tele-Data Guard Phone Tap Detector Privacy Home Security Module NEW KJB TDG028 | | | US $24.00 | 26d 20h 45m |
 | New! Cobra Performance Radar/Laser Detector with Ultra Bright Data Display | | | US $59.99 | 26d 5h 31m |
 | Data Instruments 3LC12-3WS Detector 3 #9676002 (UVG) | | | US $200.00 | 25d 11h 3m |
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| | The Performance of the Atlas Detector (Hardcover) $197.69 The ATLAS detector at the CERN Large Hadron Collider is an apparatus of unprecedented complexity, designed to probe physics in proton-proton collisions at centre-of-mass energies up to 14 TeV. It was installed in its underground cavern at the LHC during the period 2004 to 2008. Testing of individual subsystems began immediately with calibration systems and cosmic rays, and by 2008 full detector systems could be operated with the planned infrastructure, readout, and monitoring systems. Several commissioning runs of the full detector were organized in 2008 and 2009. During these runs the detector was operated continuously for several months with its readout triggered by cosmic ray muons. At the same time, regular calibrations of individual detector systems were made. In the course of these runs, signals from tens of millions of cosmic ray events were recorded. These commissioning runs continued until the first beam-beam collisions in late 2009.This volume is a collection of seven performance papers based on data collected during this commissioning period. Five papers deal with the response of individual detector systems. One paper describes the performance of the simulation infrastructure used to model the detector`s response to both cosmic rays and to the later beam-beam collisions. The final paper describes measurements drawing on the integrated performance of several detector systems. It studies lepton identification, the response to low energy electrons, muon energy loss in the calorimeters, missing ET effects, and the combined performance for muons when both the muon spectrometer and the inner tracking detector are used. These papers summarize the studies of the ATLAS detector performance and readiness prior to the start of colliding beam data. They are reprinted from The European Physical Journal C where they have been published between summer 2010 and spring 2011. |
| | Cobra 9-Band Performance Radar/Laser Detector with UltraBright Data Display - ESD7100 $59.99 The Cobra 9-band performance radar/laser detector with UltraBright Data Display provides reliable detection of 4 radar signals, 4 laser signals and Safety Alert warning signals from systems equipped with Safety Alert transmit.Product Features:14-band detection, including X Band, K Band, Ka Superwide, Ku Band, VG-2, Spectre I and Spectre IV+ radar signals; LTI 20-20, Ultra Lyte, ProLaser, ProLaser III, Stalker LIDAR and Speedlaser laser signals; Safety Alert Traffic Warning SystemXtreme Range Superheterodyne technology for improved radar detection; LaserEye provides 360 detection of laser signalsUltraBright Data Display provides easy recognition of the band detected by use of band identification icons; dim mode dims the display for night drivingIntelliMute Pro relative speed-sensing auto shutdown feature renders your detector undetectable by radar detector-detectors; Safety Alert warns of approaching emergency vehicles, railroad crossings and road hazardsOther features include POP mode radar gun detection, auto mute, digital signal strength meter, city/highway modes and stay-set electronic memoryIncludes straight 12V DC power cord, windshield mounting bracket with suction cups and instruction manual. Most Electronics products are available for in-store pickup from Advance Auto Parts. |
| | Cobra ESD7400 9 Band ExtraSensory RadarLaser Detector with UltraBright Data Display $69.32 The ESD7400 is an affordable radar/laser detector with reliable and proven performance. The unit detects all radar frequencies and laser signals currently used in United States and Canada. It comes with the UltraBright Data Display and much more. Spectre 1 Undetectable provides complete immunity to Spectre I radar detectordetectors and VG2 Undetectable provides complete immunity to VG2 radar detectordetectors. UltraBright Data Display provides easy recognition of band detected by use of band identification icons. LaserEye provides 360degree detection of laser signals VG2 Alert alerts the user when they are under surveillance of VG2 radar detectordetectors. Safety Alert warns drivers of the presence and/or approaching emergency vehicles railroad crossing and road hazard locations equipped with Cobra s exclusive Safety Alert transmitters. Auto Mute automatically mutes the alert tone for enhanced driver convenience |
| | Cobra XRS-9550G Radar Detector $145.99 1 Year Limited 1.30" Height x 2.80" Width x 4.40" Depth 360° 5.30 oz Voice alert Pop detection IntelliMute Pro Safety Alert System (SAS) Stores up to 1,000 user alert locations Xtreme Range Superheterodyne technology DigiView Data Display The XRS 9550G provides total protection and peace of mind with the Xtreme Range Superheterodyne technology, detecting all 14 radar/laser bands with reliable and proven performance. The unit provides extra detection range and the best possible advance warning to even the fastest of POP mode radar guns. It comes with a GPS Locator and Lifetime Subscription to AURA Database to alert you to verified Speed and Red Light Camera locations, dangerous intersections, and reported Speed Trap locations. Other features include Cobra exclusive GPS 8-point compass, Voice Alert, text display, and more. City Cobra Cobra Electronics Corporation Highway K-band Ka Band Ku Band Laser Radar Detector Spectre Alert VG-2 Alert X-band XRS-9550G XRS-9550G Radar/Laser Detector www.cobra.com |
| | VEHICLE DETECTOR $182.99 VEHICLE DETECTOR |
| | Heartbeat Detector $6.99 Heartbeat Detector |
| | Detector,Counterfeit $9.99 DETECTOR,COUNTERFEIT |
| | Cobra ESD 7100 Digital Radar Detector $39.99 0" - ± 50 1 Year Limited 1.30" Height x 2.76" Width x 3.86" Depth 360° 4.27 oz UltraBright Data Display City Cobra Cobra Electronics Corporation Dim ESD 7100 Digital Radar Detector ESD-7100 Highway K-band K-band 24.13 GHz ± 125 MHz Ka Band Ka Band 34.70 GHz ± 1.30 GHz Laser Radar Detector Spectre Immunity VG-2 X-band X-band 10.53 GHz ± 50 MHz www.cobra.com |
| | Garmin ecoRoute HD Speed Detector $88.99 010-11380-00 Automobile Navigators: nuvi 1260T nuvi 1370T nuvi 1390T nuvi 1490T nuvi 1690 Transform your compatible nüvi into a real-time diagnostic computer with ecoRoute HD. This easy-to-install device not only provides fuel and mileage reports, but you get more accurate fuel consumption/conservation data by tapping into your vehicle's diagnostic system. Calculate your carbon footprint, engine performance and more all through your nüvi. With ecoRoute HD, you not only save fuel, but the vehicle diagnosing capabilities could also save a trip to the mechanic. After completing a simple setup, you can use your nüvi to run diagnostic testing on vehicle systems, such as the battery and drive train, and you can monitor engine data, including temperature and emissions. You'll also receive diagnostic trouble codes and be able to reset your check engine light. Engine Monitor Garmin Garmin, Ltd Speed Detector ecoRoute HD ecoRoute HD Speed Detector www.garmin.com |
| | Multi-Channel Wireless RF Detector $1000 What's in the Box Multi-Channel Professional Wireless RF Detector 2 Antennas 2x AAA Batteries Flathead Screwdriver User's manual Are You Being Electronically Spied on Without Your Knowledge? The Professional Wireless Radio Frequency Detector is a low-cost, highly effective bug sweeping device that detects a wide range of illegal spying devices such as hidden wireless cameras, digital audio recorders, wire taps, Bluetooth, GSM, DECT and CDMA data link and mobile network connecting devices. Uses/Benefits: Wireless Communications Security Information Technology Security Personal Identity and Corporate Information Security Protection from Identity Theft and Fraud Business Financial Data Leaks, Corporate Brand Damages Keep Personal Activities, Business Conversations, Family Discussions Private Intellectual and Organizational Privacy Key Features: Compact & Portable Professional Frequency Detector Detects Data Link and Network Connection Technologies and a Wide Spectrum of Wireless Eavesdropping Devices 6-channel wireless (data link, network and channel access method) frequency detection range Detects GSM, CDMA, 3G, Bluetooth, WiFi and WiMax transmitters Detects Cell Phone Recorders, GPS Trackers, Wireless Cameras, Hidden Spy Cameras, Digital Audio Recorders, Body-Worn Surveillance, Digital Cordless Phones, Conferencing Telephones, VoIP (Internet)Phones, Baby Monitors, FRS/GMRS 2-Way Radios, Bluetooth and even WiMax technologies, WiFi Blu-ray Disc Players, Internet TVs, and more 6-bar graph indicator with (each with 10 signal strength levels) for quick, precise detection of illegal RF recorders and listening devices 4-Convenient Operating Modes: Silent, Vibration, Visual, Beep Detection 2-Levels of Frequency Type/Sensitivity Adjustment Control Extra Display Shows a More Reliable Source of Probable Wireless Networks and Bugs Durable, Damage-resistant Metallic Housing State-of-the-Art Microprocessor delivers highly accurate source-signal readings, making it faster and easier to find the precise location of electronic bugging devices Simplified Use Professional Bug Sweeper with Superior Microprocessor Virtually Eliminates False Positives Detects Harmful Radiation Emissions from Common Household Appliances like Microwaves |
| | Cobra 9Band Radar/Laser Detector With Ultrabright Data Display $69.32 Spectre I And Vg2 Undetectable. Spectre I Undetectable Provides Complete Immunity To Spectre I Radar Detectors. Vg2 Undetectable Provides Complete Immunity To Vg2 Radar Detectors. Ultrabright Data Display Provides Easy Recognition Of Band Detected By Use Of Band Identification Icons. Lasereye 360 Detection. Vg2 And Safety Alert. Vg2 Alert Warns Drivers Of The Presence And/Or Approaching Emergency Vehicles Railroad Crossing And Road Hazard Locations Equipped. Auto Mute. City/Highway Modes |
| | Xrs 9545 14 Band Radar/laser Detector $110.94 Cobra XRS-9545 Digital Radar/Laser DetectorThe XRS-9545 provides total protection and peace of mind with the Xtreme Range Superheterodyne technology, detecting all 14 radar/laser bands with reliable and proven performance. It comes with the DigiView Data Display, Voice Alert, and much more.14 Band High Performance Digital Radar/Laser DetectorVoice Alert / Digital Signal Strength Meter and DigiView Data DisplayIntelliMute Pro Relative Speed Sensing Auto Shutdown FeatureVG-2 Undetectable / Provides Complete Immunity to VG-2 Radar Detector DetectorsPOP Mode Radar Gun Detection and Ku Band DetectionUltraBright Data Display |
| | Cobra Electronics 9 Band Radar/Laser Detector $70.95 Provides 360? detection of laser signals Safety Alert warns driver of emergency vehicles and road hazards from systems equipped with Safety Alert transmitters VG-2 Alert alerts the user when they are under surveillance of VG-2 radar detector-detectors VG-2 undetectable provides complete immunity to VG-2 radar detector-detectors Ultra-Bright Data Display provides easy recognition of band detected by use of band identification icons City/highway selector allows the user to select operating mode, reducing the frequency of falsing in densely populated urban areas Auto mute automatically mutes the alert tone for enhanced driver convenience Spectre Undetectable provides complete immunity to Spectre I radar detector-detectors Backed by full manfufacturer 12 month warranty Dectects: 4 radar signals: X band radar, K band radar, Ka superwide radar, VG-2 radar 4 laser signals: LT1 20-20 laser, ultra lyte laser, ProLaser, ProLaser III Includes: Radar/ Laser detector Windshield mounting bracket Power cord Manual |
| | Xrs 9345 14 Band Radar/laser Detector $78.94 Cobra XRS-9345 Digital Radar/Laser DetectorThe XRS-9345 provides total protection and peace of mind with the Xtreme Range Superheterodyne technology, detecting all 14 radar/laser bands with reliable and proven performance. It comes with the UltraBright Data Display, LaserEye 360 degrees detection and much more.14 Band High Performance Digital Radar/Laser DetectorSpectre I Undetectable and Spectre Alert I/IVplusIntelliMute Pro Relative Speed Sensing Auto Shutdown FeatureVG-2 Undetectable / Provides Complete Immunity to VG-2 Radar Detector DetectorsPOP Mode Radar Gun Detection and Ku Band DetectionUltraBright Data Display |
| | Xrs 9445 14 Band Radar/laser Detector $90.94 Cobra XRS-9445 Digital Radar/Laser DetectorThe XRS-9445 provides total protection and peace of mind with the Xtreme Range Superheterodyne technology, detecting all 14 radar/laser bands with reliable and proven performance. It comes with the UltraBright Data Display, Voice Alert and much more.14 Band High Performance Digital Radar/Laser DetectorSpectre I Undetectable and Spectre Alert I/IVplusIntelliMute Pro Relative Speed Sensing Auto Shutdown FeatureVG-2 Undetectable / Provides Complete Immunity to VG-2 Radar Detector DetectorsPOP Mode Radar Gun Detection and Ku Band DetectionUltraBright Data Display |
 | Quantum entanglement apparatus Photo Mugs |
DescriptionQuantum entanglement experiment. Face of a quantum physicist refracted in the lens of a receiver in a quantum entanglement experiment. Entanglement is a property of a pair of particles in which a change to one has an instantaneous effect on the other, no matter how far apart they are... |
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DescriptionAvailable in red or yellow. |
 | Extech EX330 Autoranging Mini Multimeter with Built In Thermometer with Type K Remote Probe List Price: |
DescriptionCombines a multimeter with a built-in noncontact AC voltage detector. Functions include capacitance, frequency, duty cycle and temperature. Cat. III-600V. UL listed. Large display and a host of features... |
 | Handheld MD812 MD-812 Digital Wood Moisture Content Meter with Lcd Display |
DescriptionMD812 Digital Wood Moisture MeterDigital large size LCD displayMeasuring Range: 5%~40%Accuracy: 1%Date hold and can hold valueBattery: One 9V batteryLow power indicating and can select in 2pins sensor or 4pins sensor... |
 | Microlife 3MC1-PC Ultimate Automatic Blood Pressure Monitor with Irregular Heartbeat Detection List Price: |
DescriptionThe Microlife Ultimate Automatic Blood Pressure Monitor meets all of the American Heart Association's recommendations for home blood pressure monitors: third party validations for accuracy, the ability to take 2 or more readings and average them, and the ability to store readings and transmit them to your doctor... |
 | Timex Digital Transmission Heart Rate Sensor and Strap List Price: |
DescriptionAccurately measure your heart rate every time with the Timex digital heart rate sensor chest strap. Compatible with all Timex digital heart rate monitors and Bodylink systems, the elastic strap fits most body types, with a comfortable, fully adjustable design... |
 | Ultralife 9V Lithium Battery For Smoke Detectors Garage Openers Etc Cardboard Card 1 Pack List Price: |
DescriptionBest in general 9V applications. |
 | Photo Jigsaw Puzzle of Quantum entanglement apparatus from Science Photo Library |
DescriptionPhoto Puzzle, Quantum entanglement apparatus. Quantum entanglement experiment. Face of a quantum physicist refracted in the lens of a receiver in a quantum entanglement experiment. Entanglement is a property of a pair of particles in which a change to one has an instantaneous effect on the other, no matter how far apart they are... |
 | Wild Planet Spy Gear Spy Video Trakr Bundle |
DescriptionThe Wild Planet Spy Gear Spy Video Trakr Robot is the first app-enabled robotic toy, a remote-controlled vehicle that digitally transmits color video, audio and data and allows users to create, download and share custom programs... |
 | Cobra ESD7400 Performance Radar/Laser Detector with Ultra Bright Data Display, Safety Alert and VG2/Spectre Surveillance Undetectable List Price: |
DescriptionSpectre I Undetectable - Provides complete immunity to Spectre I radar detector-detectors : VG-2 Undetectable - Provides complete immunity to VG-2 radar detector-detectors : UltraBright Data Display - Provides easy recognition of band detected by use of band identification icons : LaserEye - Provides 360-degree detection of laser signals : VG-2 Alert - Alerts the user when they are under surveillance of VG-2 radar detector-detectors : Safety Alert - Warns drivers of the presence and/or approaching emergency vehicles, railroad crossing, and road hazard locations equipped with Cobra's exclusive Safety Alert transmitters : Auto Mute - Automatically mutes the alert tone for enhanced driver convenience : City/Highway Modes - Allows the user to select operating mode, reducing the frequency of falsing in densely populated urban areas : In the box - : ESD 7400 Detector Unit : Straight 12V DC Power Cord : Windshield Mounting Bracket with suction cups : Instruction manual : Unit Dimensions - 1... |
 | Beltronics RX65-Red Professional Series Radar Detector List Price: |
DescriptionIf you are as serious about safety as you are about driving, then you need the Beltronics RX65 Professional Radar Detector . The Beltronics RX65 Features extreme sensitivity to all Radar and Laser bands with over 10 times the range of other imported detectors... |
 | Cobra XRS 9945 Voice Alert 15 Band Radar/Laser Detector with Full-Color DataGrafix Display, Digital Compass, and Upgradeable Features List Price: |
DescriptionThe XRS 9945 provides total protection and peace of mind with Super-Xtreme Range Superheterodyne Technology, detecting all 15 radar/laser bands with its super-fast lock-on detection circuitry. The unit provides extra detection range and the best possible advance warning to even the fastest of POP mode radar guns... |
 | PhantomALERT Red Light Camera, Speed Camera, and Speed Trap Detector Software for Select Garmin, TomTom, and Magellan GPS (1-Year Download Subscription) List Price: |
DescriptionPhantomAlert is a must-have accessory for any GPS navigation device (not included), especially if you will be traveling in areas you are unfamiliar with and may not be aware of the sudden changes in the speed limit... |
 | PhantomALERT Red Light Camera, Speed Camera and Speed Trap Detector Software for select Garmin, TomTom and Magellan GPS (Lifetime Subscription) |
DescriptionPhantomALERT turns ordinary personal GPS navigation devices and smart phones into powerful Red Light Camera & Speed Trap detectors. In minutes your GPS device will start saving you the money--and the headaches--from receiving costly traffic tickets... |
 | PhantomALERT Red Light Camera, Speed Camera, and Speed Trap Detector Software for Select Garmin, TomTom, and Magellan GPS (1-Month Download Subscription) |
DescriptionPhantomAlert is a must-have accessory for any GPS navigation device (not included), especially if you will be traveling in areas you are unfamiliar with and may not be aware of the sudden changes in the speed limit... |
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DescriptionAs networks have increased in complexity, so too have cable installations, with dozens and sometimes hundreds of cables running together throughout a home or office setting. As a result, it can be a serious hassle to add, replace, or even identify cables within a bundled voice, data and video installation... |
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Description- Multi-link 4 Port line sharing device- Automatically screens and routes all voice, fax, and modem calls to the right equipment- Allows up to 4 voice/data devices to share a single phone line- Compatible with virtually all phone/phone systems, fax machines/PC faxcards, internal/external modems and TDD phones- "Barge-In" protection- Factory-direct support& programming- The default factory programming(single ring) can be reprogrammed to 2 rings to accommodate Caller ID- Saves the average user 00 a year by removing only one phone line (multiple locations and lines really add up)- Auto fax detection (screens each call for CNG fax tones, pulse and touch tones, and routes the call automatically)- Programmable security access codes- Quality "ring back" tone- Non-volatile memory (saves programming in a power outage)- Maintains regular phone service in a power outage- Call override (overrides the Stick, can grab an inbound call from any extension)- Red LED status light- WhiteSTICK |
 | Command Communications Comswitch 5500 3-Port Phone/Fax Modem Line Sharing Device |
DescriptionThe ComSwitch 5500 fax switch to automatically route calls to your phone, answering machine, fax or modem - all on a single line! Choose Automatic or Semi-Automatic operation. (Telephone line sharing device - fax switch). |
 | Building Wireless Sensor Networks: with ZigBee, XBee, Arduino, and Processing List Price: |
DescriptionGet ready to create distributed sensor systems and intelligent interactive devices using the ZigBee wireless networking protocol and Series 2 XBee radios. By the time you're halfway through this fast-paced, hands-on guide, you'll have built a series of useful projects, including a complete ZigBee wireless network that delivers remotely sensed data... |
 | Getting Started with the Internet of Things: Connecting Sensors and Microcontrollers to the Cloud (Make: Projects) List Price: |
DescriptionWhat is the Internet of Things? It's billions of embedded computers, sensors, and actuators all connected online. If you have basic programming skills, you can use these powerful little devices to create a variety of useful systemsâsuch as a device that waters plants when the soil becomes dry... |
ICON DATA METAL DETECTOR DATA LOGGER.wmv
How much more sensitive is a TCD detector than an HID detector for carbon dioxide quantitation?
I would like to use a new MolSieve column from Restek, the ShinCarbon mol sieve, but all their paperwork shows detection with an HID detector, and I have a TCD. The TCD is listed as appropriate in the literature, but no data is shown.
Try this -
The TCD consists of four tungsten-rhenium filaments in a Wheatstone bridge configuration. Electric current flows through the four filaments causing them to heat up. Carrier gas ( typically helium which has very high thermal conductivity ) flows across the filaments removing heat at a constant rate. When a sample molecule with lower thermal conductivity exits the column and flows across the two sample filaments, the temperature of the filaments increase unbalancing the Wheatstone bridge and generating a peak as the sample molecules transit through the detector. The TCD detector is useful because it detects all molecules, not just hydrocarbons, so it is commonly used for fixed gas analysis ( O2, N2, CO, CO2, H2S, NO, NO2, etc. ) where the target analytes do not respond well on other more sensitive detectors. The TCD is able to detect concentrations from 100% down to about 100 ppm, but not lower. Even 100 ppm is only possible where the chromatography permits a sharp peak on a flat baseline. Where the peak is broad or the baseline is not perfectly flat, detection limits of 300 ppm are more realistic. For lower detection limits, the HID detector may be more suitable for inorganics, and of course the FID provides 1 ppm detection for hydrocarbon species.
