Présentation; Emissivity - Chauvin Arnoux C.A 879 Notice De Fonctionnement

CONTENTS
1. PRESENTATION ................................................................. 9
2. EMISSIVITY ....................................................................... 9
3. DESCRIPTION ................................................................. 10
4. USE .................................................................................. 10
5. SPECIFICATIONS ........................................................... 12
6. MAINTENANCE ............................................................... 12
7. ORDERING ....................................................................... 13
1. PRESENTATION
The C.A 879 infrared thermometer is an instrument for
measuring temperature without contact. The C.A 879 provides
precision measurement, thanks to its LASER viewfinder
feature. To measure the temperature of an object, simply point
the probe at the surface of the object and the temperature will
appear on the digital display. The thermometer has an automatic
shut-off feature.

2. EMISSIVITY

All objects whose temperature is higher than absolute zero
(-273.15 K) emit infrared energy. This energy radiates in all
directions at the speed of light. When you point the probe at an
object, the probe's lens senses this energy and focuses it onto
an infrared detector comprised of a thermocouple stack. The
detector produces a voltage signal proportional to the amount
of energy received, and therefore proportional to the object's
temperature. Certain objects emit infrared energy, but also reflect
it. Unlike matt surfaces, shiny or highly-polished surfaces tend
to reflect energy. This reflection is represented by a factor
called emissivity, which may vary from 0.1 for a highly reflective
object to 1 for a black object. In the case of the C.A 879
thermometer, the emissivity is preset at 0.95, the most frequent
value, enabling approximately 90% of all applications to be
covered.
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