AEMC CA876 User Manual

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Contents

AEMC CA876 User Manual Manual pdf 12 page image

10 Infrared K-Thermometer Model CA876CHAPTER 4OPERATION4.1 Infrared Measurement ConsiderationsMEASUREMENT THEORYEvery object emits infrared (IR) energy proportional to its temperature. Bymeasuring the amount of this radiant energy, it is possible to determinethe temperature of the emitting object. Infrared radiation is invisible light(electromagnetic radiation), which easily travels through air and is easilyabsorbed by solid matter. An IR thermometer, which operates by detectinginfrared radiation, can accurately measure an object surface temperaturewithout touching it and independently of the air temperature or the mea-surement distance.Infrared radiation, which is emitted from the object, is focused into an infra-red radiation sensor through an optical system. This system includes anoptical lens, which is transparent to infrared radiation, and a 5.3μm cutoff filter. The output signal from the infrared radiation sensor is input to anelectronic circuit, along with the output signal from a standard temperaturesensor, to calculate the temperature and display it on the meter display.EMISSIVITYAll objects emit invisible infrared energy. The amount of IR energy emittedis proportional to the object’s temperature and its natural ability to emit IRenergy. This ability, called emissivity, is based upon the object materialtype and its surface finish. Emissivity values range from 0.10 for a veryreflective object to 1.00 for a black body. Factory set emissivity value of0.95 will cover 90-95% of typical applications.If frost or other material/substance covers the measured surface, clean itto expose the surface. If the surface to be measured is highly reflective,apply dull masking tape or matte black paint over the surface. If the ther-mometer seems to be giving incorrect readings, check the front sensor.There may be condensation or debris obstructing the sensor. Only cleanper instructions.www. .com information@itm.com1.800.561.8187