Non Contact
Non Contact
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Non Contact IR Laser Infrared Digital Thermometer NEW |  |
0 Bid | US $.99 | 26m |
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EXTECH DA30 Non contact AC Current Detector 200mA 1KA | |
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US $29.99 | 31m |
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Mini Wireless Non Contact Digital Temperature Infrared Thermometer DT 300 Black | |
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US $12.56 | 33m |
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Sinometer DCY25 Non contact AC DC Voltage Detector NEW | |
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US $7.99 | 1h 24m |
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ALLEN BRADLEY FERROGARD ACTUATOR NON CONTACT SWITCH | |
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US $19.99 | 1h 44m |
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MARINE PART LED BULB B15D DOUBLE CONTACT NON PARALLEL | |
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US $24.00 | 1h 53m |
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New MASTECH MS8900 Non contact 100V 240V AC Voltage Detector Sensor Tester Pen | |
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US $6.14 | 2h 23m |
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Infrared IR Laser Non Contact Thermometer XC XF Y334 | |
0 Bid | US $33.70 | 2h 31m |
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Infrared IR Non Contact Pocket Digital Thermometer Pen | |
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US $14.75 | 2h 36m |
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NEW Infrared Digital Thermometer Non Contact Surface Temperature Measurement | |
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US $139.99 | 2h 48m |
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NEW DIGITAL NON CONTACT LASER PHOTO TACHOMETER TACH RPM | |
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US $34.99 | 2h 50m |
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Infrared IR Laser Non Contact Thermometer XC XF M334 | |
0 Bid | US $33.70 | 2h 55m |
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NEW AC Voltage Detector w Infrared Thermometer IR Non Contact Data Hold | |
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US $56.99 | 3h 14m |
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Non Contact LCD Infrared Thermometer Temperature Gun | |
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US $74.96 | 3h 15m |
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NON CONTACT IR LASER TEMPERATURE GUN INFRARED DIGITAL THERMOMETER SIGHT HANDHELD | |
0 Bid | US $18.95 | 3h 48m |
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American Optical AO Non Contact II Tonometer 12415USED | |
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US $106.24 | 3h 54m |
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Raytek MT4 Mini Temp Non Contact Thermometer w Laser | |
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US $61.79 | 3h 54m |
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EXTECH DVA30 — Non Contact AC Volt Current Detector | |
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US $38.99 | 3h 57m |
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VICTOR Non Contact Voltage Pen AC Detector Live wire | |
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US $9.99 | 3h 58m |
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Cal Hawk Non Contact Voltage Tester New Free Shipping | |
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US $7.99 | 4h 2m |
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Mini Non Contact Infrared Thermometer DT 300 Black New | |
0 Bid | US $.01 | 4h 7m |
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Raytek MiniTemp MT4 Non Contact InfrarRed Thermometer | |
0 Bid | US $15.00 | 4h 12m |
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New Fluke 2AC Non Contact Voltage Detector Tester Meter VoltAlert Sensor Pen | |
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US $31.11 | 4h 25m |
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Victor VC305 Non Contact Infrared Thermometer 3 LED 81 | |
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US $56.86 | 4h 25m |
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New Fluke 2AC Non Contact VoltAlert Voltage Detector Pen Tester Meter Sensor AC | |
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US $25.00 | 4h 28m |
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New Fluke 2AC VoltAlert Voltage Detector Non Contact Tester Meter 90 1000 Volts | |
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US $25.11 | 4h 28m |
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Safety Standard Non contact Tester Sensor AC Voltage Detector 100 240V AC | |
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US $9.70 | 4h 29m |
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UNI T UT301A Infrared Thermometer Non Contact 121 | |
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US $64.50 | 4h 34m |
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wholesale Non Contact IR Laser Infrared Digital Thermometer | |
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US $30.03 | 4h 44m |
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MS5900 3 phase Non contact Rotation Field Indication Motor Direction Test Meter | |
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US $41.15 | 4h 52m |
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Non Contact IR Infrared Laser Digital Thermometer | |
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US $19.99 | 5h 17m |
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EXTECH EX330 12 Function MultiMeter Non Contact Voltage Detector w Test Probes | |
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US $49.99 | 5h 19m |
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Non Contact LCD Pocket IR Infrared Digital Thermometer | |
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US $9.21 | 5h 22m |
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Non Contact Pocket Laser Infrared IR Digital LCD Thermometer | |
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US $11.79 | 5h 23m |
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Pen Style Non Contact AC Electric Voltage Detector Sensor Tester 90V 1000V | |
0 Bid | US $4.99 | 5h 31m |
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Non Contact infrared Thermometer Gun Lazer sight temperature NEW SEALED | |
1 Bid | US $21.95 | 5h 44m |
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V3746 Non Contact LCD Infrared Digital Pen Thermometer Black | |
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US $10.28 | 5h 57m |
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Non Contact IR Diode Laser Gun Infrared Digital Thermometer for Baby Adult | |
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US $19.99 | 6h 7m |
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Non Contact IR Laser Infrared Digital Thermometer DT380 | |
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US $14.68 | 6h 20m |
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Pen Style Non Contact AC Electric Voltage Detector Sensor Tester 90V 1000V with | |
0 Bid | US $.99 | 6h 26m |
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DT 128M Non Contact Moisture Meter dampness indicator | |
0 Bid | US $99.95 | 6h 34m |
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Ultrasonic Motion Detector Sensor Module Security Non contact | |
1 Bid | US $8.90 | 6h 40m |
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Infrared IR Laser Non Contact Digital Thermometer 50 280°C 58 572°F 121DS | |
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US $19.90 | 7h 2m |
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Non Contact Infrared IR Digital LCD Thermometer °C °F | |
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US $11.79 | 7h 11m |
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2in1 Digital LASER Photo Non Contact Tachometer RPM | |
1 Bid | US $23.30 | 7h 12m |
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LCD Digital Laser Photo Tachometer Non Contact RPM Tach | |
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US $60.96 | 7h 15m |
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RAYTEK model ST80XBUS Professional Non Contact Thermometer Infrared | |
0 Bid | US $210.00 | 7h 17m |
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Non Contact Laser Point Infrared IR Digital LCD Thermometer | |
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US $12.39 | 7h 46m |
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Serial Ultrasonic Motion Detector Sensor Module Security Non contact | |
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US $15.90 | 8h 5m |
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Non contact Gooseneck Infrared IR Laser Thermometer NEW | |
0 Bid | US $34.95 | 8h 11m |
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UT 12A Uni t Non Contact AC Voltage Detectors UT12A | |
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US $11.80 | 8h 28m |
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Non Contact IR Infrared Digital Thermometer 32 380°C | |
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US $19.35 | 8h 47m |
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Digital Photo Laser Tachometer Non Contact Tool DG1 | |
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US $24.92 | 8h 52m |
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Digital Laser Photo Non Contact Tachometer Tester 25 99999 RPM Meter Measurer | |
1 Bid | US $19.90 | 8h 55m |
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Non Contact AC Voltage Pen Detector Tester Meter 500V | |
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US $2.95 | 9h 2m |
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Non latching Contact Blue Cap Lamp Push Button Switch | |
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US $7.72 | 9h 21m |
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NON CONTACT DIGITAL LASER PHOTO TACHOMETER | |
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US $34.95 | 9h 22m |
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Voltage Detector Pen Non Contact AC Tester Pen 90 1000V | |
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US $2.67 | 9h 30m |
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New NON CONTACT INFRATED THERMONETER MT 350 | |
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US $95.00 | 9h 42m |
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2in1 Digital LASER Photo Non Contact Tachometer 99999 RPM Meter Tester Measurer | |
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US $33.99 | 9h 43m |
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New Non Contact DT 380 IR Infrared Digital Thermometer Laser Red Laser Power | |
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US $19.40 | 9h 48m |
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Fluke Non Contact 2AC VoltAlert Voltage Detector | |
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US $25.75 | 9h 59m |
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Non Contact IR Infrared Digital Thermometer with Laser | |
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US $17.49 | 10h 16m |
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New AC Non Contact Voltage Tester w Voltbeat Technology Continuous Self Test | |
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US $38.54 | 10h 24m |
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MS8900 AC Non contact VOLTAGE DETECTOR | |
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US $15.90 | 10h 57m |
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VICTOR 305 Non contact Infrared thermometer 20C 500C | |
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US $62.50 | 10h 57m |
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Non Contact Digital IR Infrared Thermometer 50 550C | |
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US $26.12 | 10h 58m |
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Non Contact IR Infrared Laser Point Digital Thermometer | |
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US $20.97 | 10h 59m |
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AC 250V Single Action Non latching Contact Foot Pedal Switch | |
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US $14.39 | 11h 2m |
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MASTECH MS6530 Infrared Thermometer Non Contact IR | |
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US $82.00 | 11h 6m |
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GM700 Non Contact IR Infrared Thermometer Laser Point | |
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US $37.72 | 11h 19m |
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Thermohawk 220 Series IR Non Contact Thermometer Q3I TH220 | |
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US $30.43 | 11h 28m |
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SANPO ST350 Infrared Thermometer Non Contact | |
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US $26.99 | 11h 30m |
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UNI T UT12B Non Contact AC Voltage Detectors | |
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US $11.90 | 11h 34m |
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UNI T UT 301B Non Contact Infrared IR Thermometer | |
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US $84.90 | 11h 34m |
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UNI T UT 300A Non Contact Infrared IR Thermometer | |
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US $39.90 | 11h 34m |
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Mastech MS6550B Non Contact Infrared Thermometer | |
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US $409.49 | 11h 34m |
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DYZX 2 Non Contact 3 Phase Rotation Tester | |
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US $109.49 | 11h 34m |
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Fluke 117 Electricians Multimeter Non contact voltage | |
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US $165.00 | 11h 34m |
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SANPO DT2234C Non contact Tachometer laser | |
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US $33.49 | 11h 34m |
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UNI T UT 301C Non Contact Infrared IR Thermometer | |
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US $90.00 | 11h 38m |
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UNI T UT 301A Non Contact Infrared IR Thermometer | |
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US $64.50 | 11h 38m |
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UNI T UT 300B Non Contact Infrared IR Thermometer | |
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US $47.90 | 11h 38m |
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Mastech MS8211 Pen Multimeter Non Contact AC Voltage | |
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US $39.99 | 11h 38m |
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NON CONTACT IR LASER GUN INFRARED DIGITAL THERMOMETER | |
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US $26.98 | 11h 42m |
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Voltage Detector Pen Non Contact AC Tester Pen 90 1000V | |
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US $2.45 | 12h 3m |
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Contact And Non-Contact Varieties Of Temperature Sensors
Generally temperature sensors fall into two distinct categories, defined as contact and non-contact. It must be remembered that sensors and particularly those that measure temperature inherently have problems with accuracy. What is important to recognise is that the discrepancy estimates should be accurate and many readings should be made in order for the final results to have decent levels of accuracy.
Part of this is to calibrate your temperature sensors whether they are contact or non-contact with a known temperature, by doing this you can minimise any discrepancies in the readings, making your measurement extremely accurate; this process is fundamentally important before any measurement can take place.
Contact temperature sensors essentially measure their own temperature at any given time. They do this by creating a thermal equilibrium between the sensor and the substance being measured. Thermal equilibrium simply means that the two bodies have no heat flowing between them and are hence the same temperature. There are however a variety of errors that can occur when using these types of sensors, for instance surfaces are especially hard to measure with contact sensors, in such instances a non-contact method is more avoidable.
Contact sensors are by far the norm for temperature measurement in science and industry. Types of contact sensor include thermocouples and thermometers. Thermocouples use an electrical current with specific resistance levels that through variations of this resistance can measure temperature; this is widely termed the Seebeck effect. Out of the temperature sensors utilised in science and industry thermocouples are some of the most widely used due to their ease of operation, relative inexpensiveness and their ability to measure across a wide spectrum.
Thermometers as a means of measuring temperature differ greatly, not only in terms of accuracy but in terms of operation. Of course there is the most widely used sensor in the world the liquid glass thermometer; the one that measured your fever when you were a child. As well as these however there are filled system thermometers used in ovens to regulate cooking temperatures as well as bimetallic thermometers that have two metals contained within them that measure at different rates. However there is no need to use an expensive thermometer, it is even possible to measure temperature with the use of materials that change state at certain temperatures, scientifically these are known as phase change devices.
Less widespread is the use of non-contact sensors, as a result the manufacture and use of these devices is less standardised than the contact type. The situation is changing however; in the medical profession the use of the infra red ear thermometer is becoming extensive as a more efficient and effective way of gaining patient temperatures. The lack of standardisation of other forms of non-contact sensors has meant that they are struggling to be utilised across a wide variety of industry sectors.
Fundamentally they work on the principles of Plank's law; that is the thermal emission of radiation, although the names given to this type of sensors are extremely varied, adding to the confusion that surrounds their usage. Names such as pyrometer, radiometer and thermal imager are most common but are in no way a comprehensive list for this type of temperature sensor.
Today temperature sensors are used in all manner of industries and professions. Naturally the medical profession uses both varieties of sensor extensively but those in the manufacturing of foodstuffs such as the fermenting process as well as the manufacture of goods also use thermal measurement regularly. The large number of different varieties stands testament to the importance of this piece of equipment in the world currently, fundamental is that they should be calibrated so that accurate measurements can be made.
About the Author
Equipment expert Thomas Pretty looks into the different types of temperature sensors and the industries that use them.
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