Presentation; Operation - Emissivity - Chauvin Arnoux C.A 876 Bedienungsanleitung

CONTENTS
1.

PRESENTATION ........................................................................ 15

2.

OPERATION - EMISSIVITY ....................................................... 15

3. DESCRIPTION ........................................................................... 16
4. USE ........................................................................................... 17
5. SPECIFICATIONS ...................................................................... 20
6. SENSORS ................................................................................. 21
7. MAINTENANCE .......................................................................... 22
8. TO ORDER ................................................................................ 23
9. EMISSIVITY TABLE...............................................................24
10. FRONT PANEL......................................................................24
1. PRESENTATION
The C.A 876 is a temperature measurement instrument, portable, easy to
use, with an interchangeable K-type thermocouple sensor also enabling
remote temperature measurement using infrared technology.
It uses an infrared sensor with an emissivity coefficient that can be
parameterised by the user according to the material. To remotely measure
the temperature of a body, it suffices to point using the laser pointer to
the surface of the body to be measured.
The K-type thermocouple sensor may also be used in the other cases.
The thermometer is fitted with a programmable alarm, high or low, and a
MIN/MAX function. It is supplied as standard with an anti-shock sheath
and a type SK6 flexible thermocouple sensor (from -50° to +285°C).
The CA876 features a backlit LCD screen, a HOLD function and a timed
Auto Power Off system.
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 thermometer CA876, we recommend the use of an emissivity
coefficient of 0.95, current value that covers about 90% of applications.
In other cases, adjust the emissivity to an adequate value according to
the target material (See § 9 - Emissivity Table)
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