Presentation; Operation - Emissivity; Description - Chauvin Arnoux C.A 1871 Manual De Instrucciones

1. PRESENTATION

The C.A 1871 infrared temperature sensor is a temperature
measuring tool that does not require contact and is used
connected to an mV calibre multimeter with a 10MΩ input
impedance.
To measure the temperature of an object, simply point the probe
at the surface of the object and the sensor will give out a voltage
signal proportional to the temperature measured.

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 1871 probe, the emissivity is preset at
0.95, the most frequent value, enabling approximately 90% of
applications to be covered.

3. DESCRIPTION

See § 8. Attachment (at the end of this user's manual)
Œ
Infrared measurement sensor

Connecting lead with two Ø 4mm safety plugs
Ž
Battery status indicator:

Measurement activation pushbutton
Note: If a button is pressed and the indicators are not lit, the
battery is either missing or not functioning correctly.
9
on → low
off → status OK
1