ircon Modline 4, Installation And Operation Manual

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2–7
Section 2 — INSTALLATION
2.7f
. Intervening Objects
Errors can be caused by objects between the
MODLINE 4 and target. Any such object that hap-
pens to be inside the Cone of Vision will be visible
to the detector, and will cause an error in the tem-
perature reading.
Before selecting the mounting location, consider
the sight path just as you do when you aim a cam-
era to take a photograph. Try to picture the Cone
of Vision, is within the cone, select a different view-
ing angle.
2.7g
. Reflections
Reflections from other radiating objects represent
a potential source of error in your temperature
readings. The total radiation seen by the MOD-
LINE 4 will be a combination of intrinsic radiation
plus reflected radiation.
Examples of interfering sources are hot furnace
walls and heating elements that are hotter than the
target object.
Most reflection problems can be eliminated by
changing the viewing angle or shielding the reflec-
tions. Suggestions for anticipating and eliminating
common reflection problems are provided in
Section 6. However, if you are faced with unusual
reflection problems, call IRCON Technical Service
for recommendations.
2,7h
. Use of Windows
If it is necessary to view the object through a win-
dow, as is the case when the object is being heat-
ed in a vacuum or inert atmosphere, be careful in
selecting the window material. The material must
have good transmission characteristics in the
wavelength band of the MODLINE 4 series.
A guide to appropriate windows for all MODLINE 4
Series is provided in Section 3.4.
MODLINE 4
PRODUIT CHAUD
ECRAN
THERMIQUE
TROU DE
VISEE
NOTE: Sight hole must be large enough so heat shield
does not obstruct sight path. (See Sections 2.9
and 2.10). Also, MODLINE 4 must not contact
heat shield.
WA-3
WATER COOLING
ACCESSORY
AA-3
AIR PURGE
ACCESSORY
FIG. 2.6 – MODLINE 4
(STANDARD ENCLOSURE)
WITH AIR PURGE
and WATER
COOLING SYSTEM
FIG. 2.7 – MODLINE 4
(STANDARD ENCLO SURE)
PROTECTED BY HEAT SHIELD
SIGHT HOLE
HEAT
SHIELD
MODLINE 4
HOT TARGET