Table Des Matières; Operation - Emissivity - Chauvin Arnoux C.A 870 Notice De Fonctionnement

CONTENTS
1. PRESENTATION ................................................................ 9
2. OPERATION - EMISSIVITY ............................................... 9
3. DESCRIPTION .................................................................10
4. USE ..................................................................................10
5. SPECIFICATIONS ...........................................................11
6. MAINTENANCE ................................................................. 6
7. TO ORDER .......................................................................13
8. APPENDIX .......................................................................32
1. PRESENTATION
C.A 870 and C.A 872 infrared thermometers are temperature
measurement instruments that do not require contact.
The C.A. 872 allows greater measuring accuracy, thanks to its
LASER sight.
To measure the temperature of an object, simply point the probe
at the surface of the object and the temperature will be displayed
on the digital display, the thermometer will switch off
automatically.

2. OPERATION - 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 constituted
by a stack of thermocouples. This detector transmits a voltage
signal proportional to the amount of energy received, which
means that it is 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 870 and C.A. 872 thermometers, the
emissivity is preset at 0.95, the most frequent value, enabling
approximately 90% of applications to be covered.
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