ircon Modline 4, Installation And Operation Manual

Page: 58 / 88

Section 6 — APPLICATIONS GUIDE
6–3
6.2 EMISSIVITY TABLES
For accurate temperature measurements, you
must set the Emissivity (E) control of the
MODLINE 4 to the emissivity value of the material
you intend to measure. As explained in Section
3.3, one way to determine the correct control
setting is to refer to a set of Emissivity Tables. The
tables in this section of the manual are provided
for this purpose. They are based on actual tests on
samples of the materials listed. Tables are
provided for each MODLINE 4 instrument series.
The materials in each table are grouped according
to the classes of materials usually measured by
that series (e.g., Plastics; Glass; Building
Materials; etc. for Series 44).
To use the Emissivity Tables, go to the appropriate
table for your instrument series, and locate the
material of interest in that table. Note the value in
the Emissivity column and set the
ε
control to this
value.
Be sure to observe any notes or descriptions
included in the tables. If your material is not listed,
or if you are in doubt about any of the values,
contact IRCON Applications Engineering.
PRODUIT
ELEMENT
CHAUFFANT
Modifier l'angle de visée ou changer
le point de mesure pour que l'élément
chauffant ne soit pas dans le champ
de visée du MODLINE 4 Solution:
PRODUIT
MUR DU
FOUR
Les MODLINE 4 "voit" l'énergie
emise par le mur chaud du four
et transmise à travers le produit Problème: Le MODLINE 4 "voit" l'énergie
émise par l'élement chauffant et
transmise à travers le produit Problème:
Installer un écran thermique
entre le produit et le mur du four Solution:
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ECRAN
FIG. 6.2 – SOLVING COMMON TRANSMITTANCE PROBLEMS
WORKPIECE
FURNACE
WALL
Problem: MODLINE 4 “sees” radiation from hot
furnace wall transmitted
through workpiece.
WORKPIECE
HEATING
ELEMENT
Problem: MODLINE 4 “sees” radiation from hot
furnace wall transmitted
through workpiece.
SHIELD
Solution: Change viewling angle, or measuring
location, so heating element is
not in field of view of MODLINE 4.
Solution: Install heat insulating shield
between workpiece and
furnace wall.