What is an Infrared Thermometer?
An radiation thermometer, also called infrared laser thermometer or non-contact thermometer, is a device that measures temperature from a distance without requiring physical contact. It works by using infrared technology to detect the amount of infrared radiation emitted by the target object or surface. The object's temperature is then determined through analyzing this radiation without physically touching it.
How Does an Infrared Thermometer Work?
Infrared Thermometer detect infrared energy, also known as heat energy, which is emitted by all objects above absolute zero temperature according to their thermal radiation spectrum. The device contains a sensor that measures the strength of infrared rays being emitted from the target surface or object. This optic sensor focuses the infrared waves onto a thermopile, a type of thermoelectric device, which creates an electrical current proportional to the amount of radiation. This current is then converted to a temperature reading by an electronic circuitry and displayed digitally.
Advantages of Radiation thermometers
Non-Contact Temperature Measurement: Unlike traditional thermometers that require direct physical contact, radiation thermometers allow taking temperature readings from a distance without disturbing the target object or surface. This is extremely beneficial for hygienic measurements or measuring objects which are moving or inaccessible.
Fast Readings: Radiation thermometers provide instantaneous readings compared to traditional thermometers which need time to equilibrate to match the temperature of the object being measured. This makes radiation thermometers very useful for time-critical applications.
High Accuracy: Modern radiation thermometers feature high accuracy thermopile sensors and sophisticated calibration techniques to provide repeatable and reliable temperature measurements accurate to ±0.5°C or better.
Versatility: Radiation thermometers can be used to measure temperatures of gases, liquids, and solids both at high and low ranges. With their wide temperature range, from -50°C to +1000°C, they cover most industrial and commercial applications.
Applications of Radiation thermometers
Predictive Maintenance: Radiation thermometers are valuable tools for predictive maintenance of electrical equipment like motors, air conditioners, compressors etc. by detecting hot spots indicating early failure or overload conditions. This helps schedule repairs before breakdown occurs.
Food Safety: Food processing industries utilize radiation thermometers for Hazard Analysis and Critical Control Point monitoring to ensure food safety. They check internal cooking temperatures of food accurately without contaminating it.
Healthcare: Infrared non-contact thermometers are commonly used by clinics and hospitals to safely take patient temperature without risk of cross-contamination. They are also used for cryotherapy and thermal therapy.
HVAC Systems: HVAC technicians rely on radiation thermometers to inspect air ducts, HVAC equipment and building envelopes for thermal imbalances, air leaks or moisture issues. This improves energy efficiency.
Research & Development: Radiation thermometers help R&D teams analyze thermal properties of new materials, products and processes through non-contact temperature mapping and scanning.
Pricing and Models of Radiation thermometers
Radiation thermometers are available in a wide variety of models and price ranges depending on their accuracy, features and intended applications. Basic consumer-grade models start at $30-$100 range and medical-grade devices can cost over $1000.
Key factors affecting price are measurement range, operating distance, target size, response time, emissivity adjustment, data logging, programmability, communications interface etc. Additional options like interchangeable lenses, PC software, wireless data transmission also influence cost.
Common models include handheld point-and-shoot types, pistol grip designs, fixed mount industrial formats and thermal imaging cameras. Manufacturers such as Fluke, Klein Tools, Milwaukee Tool, Testo and Optris offer a comprehensive range to suit all commercial and industrial applications.
Assessories for Radiation thermometers
A variety of useful accessories are available to enhance the functionality of radiation thermometers:
- Protective cases and holsters protect devices on the field.
- Extension probes allow measuring recessed, confined or out-of-reach spots.
- Articulating arms facilitate aimed measurements at awkward angles.
- Attachment lenses alter optics for precise small-spot or wide-angle readings.
- Emissivity calibration plates aid adjusting emissivity parameter for different materials.
- Tripods provide stable support for scanning larger areas or fixed installations.
- Temperature data loggers record and download measurement histories.
Conclusion
Radiation thermometers have revolutionized non-contact temperature measurement in industries across various sectors. Their accuracy, versatility and convenience make them ideal for condition monitoring, quality control, process optimization and predictive maintenance tasks. With continuous technological advances, infrared thermometry will keep playing a vital role as industries move towards predictive analytics and Industry 4.0. Their applications will only continue to expand in the future.
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