All solid objects emit infrared energy above absolute zero. The amount of energy emitted is proportional to the body or target temperature. Wahl’s Heat Spy directs this energy by means of fixed focus optics into a sensitive detector, which is amplified and processed by the micro processor to temperature readings in °F or °C.
It is fast because it collects IR energy at the speed of light, and the detector has a very low mass. The time constant is 0.1 second, about 10 times faster than conventional contact methods.
Measurements are displayed in less than one second. Some Heat Spy’s offer an analog output option of 1mV/deg for recording, while others feature RS232 computer interface.
What Does The Heat Spy Measure?
Temperature at a Distance
You can stand 1 to 40 feet away and conveniently measure temperature of bearings, kiln and furnace walls, locate hot spots in reactor shells, steam piping, and insulation surfaces.
Specialty models can be used up to 300 feet away from your temperature target.
Temperature of Moving Material
Moving materials require two Heat Spy features not available by any other measurement method: non-contact with the process material, and fast measurement of rapidly moving materials. Measure continuously moving solid materials such as plastic film and extrusions, pulp and paper, textiles, rubber, steel sheet, coating, or paint.
Temperature of Small Low Mass Materials
Electronic components or other small or low mass items can be measured with a Heat Spy where a contact thermometer would change the measured condition through heat transfer.
Temperature of Areas Too Hot to Approach Safely
In foundries, forging shops, glass factories, and power plants, Heat Spy’s can allow you to stand away from heat or high voltage to measure temperature up to 5800°F (3200°C).
Temperature of Rough Surfaces
The Heat Spy does not require contact with the target. It measures rough and uneven surfaces and averages temperature readings of the observed target area. It affords users an efficient method of measuring the temperature of granular materials, rough castings, and forgings.
Temperature Requiring Quick Measurement
Opening and closing of injection molding dies requires temperature to be measured in less than 2 seconds. The Heat Spy is ideal for use with rotating machinery - large motor armatures and drive couplings for example.
Heat Spy Emissivity
Emissivity in IR measurement refers to the ability of the measured surface to emit radiation. Surfaces vary in emissivity and this must be taken into account before accurate readings can be obtained. The emissivity ratio represents the amount of radiated energy the measured surface allows to be returned to the instrument. A return of 100% of the energy is measured as 1.0 emissivity. If all the radiated energy is reflected and/or transmitted and none emitted, the emissivity ratio is 0.0. A perfect radiator, such as a black body, has a 1.0 emissivity ratio and a very shiny or highly polished surface has a ratio of 0.2 or lower. Most textured or painted surfaces have an emissivity ratio of around 0.95. Many Heat Spy thermometers feature adjustable emissivity from 0.10 to 1.00. Other Heat Spy’s without adjustment are set at 0.95.
It is fast because it collects IR energy at the speed of light, and the detector has a very low mass. The time constant is 0.1 second, about 10 times faster than conventional contact methods.
Measurements are displayed in less than one second. Some Heat Spy’s offer an analog output option of 1mV/deg for recording, while others feature RS232 computer interface.
What Does The Heat Spy Measure?
Temperature at a Distance
You can stand 1 to 40 feet away and conveniently measure temperature of bearings, kiln and furnace walls, locate hot spots in reactor shells, steam piping, and insulation surfaces.
Specialty models can be used up to 300 feet away from your temperature target.
Temperature of Moving Material
Moving materials require two Heat Spy features not available by any other measurement method: non-contact with the process material, and fast measurement of rapidly moving materials. Measure continuously moving solid materials such as plastic film and extrusions, pulp and paper, textiles, rubber, steel sheet, coating, or paint.
Temperature of Small Low Mass Materials
Electronic components or other small or low mass items can be measured with a Heat Spy where a contact thermometer would change the measured condition through heat transfer.
Temperature of Areas Too Hot to Approach Safely
In foundries, forging shops, glass factories, and power plants, Heat Spy’s can allow you to stand away from heat or high voltage to measure temperature up to 5800°F (3200°C).
Temperature of Rough Surfaces
The Heat Spy does not require contact with the target. It measures rough and uneven surfaces and averages temperature readings of the observed target area. It affords users an efficient method of measuring the temperature of granular materials, rough castings, and forgings.
Temperature Requiring Quick Measurement
Opening and closing of injection molding dies requires temperature to be measured in less than 2 seconds. The Heat Spy is ideal for use with rotating machinery - large motor armatures and drive couplings for example.
Heat Spy Emissivity
Emissivity in IR measurement refers to the ability of the measured surface to emit radiation. Surfaces vary in emissivity and this must be taken into account before accurate readings can be obtained. The emissivity ratio represents the amount of radiated energy the measured surface allows to be returned to the instrument. A return of 100% of the energy is measured as 1.0 emissivity. If all the radiated energy is reflected and/or transmitted and none emitted, the emissivity ratio is 0.0. A perfect radiator, such as a black body, has a 1.0 emissivity ratio and a very shiny or highly polished surface has a ratio of 0.2 or lower. Most textured or painted surfaces have an emissivity ratio of around 0.95. Many Heat Spy thermometers feature adjustable emissivity from 0.10 to 1.00. Other Heat Spy’s without adjustment are set at 0.95.
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