3.3 Sighting Methods
The Modline 5 Sensor is a precision electro-optical instrument that senses infrared radiation. This signal
is processed by the unit’s digital circuits to provide an output proportional to the temperature being
measured. The Sensor’s linear analog current output and RS-485 digital temperature signals are brought
out through a connector on the bottom of the Sensor with a shielded cable. The output signals are then
connected to compatible devices within the process measurement system.
3.3.1 Sighting and Focusing
The Modline 5 is a variable focus instrument that features visual through-the-lens sighting by means of
a viewing sight at the rear panel of the Sensor. An optional internal Laser for through-the-lens aiming
is available. Focusing with either the visible or laser sight is accomplished using the rotating rear section
of the Sensor.
3.3.2 Visual Sight
The Modline 5 visible sight is aimed and focused onto the target to be measured as simply as an ordinary
camera. The rear focus is smooth, utilizing almost one turn of the focusing section.
A circular reticle is contained within the Sensor’s optical system and is visible when viewing through
the sight. During temperature measurement, the target image is superimposed on the reticle. Focusing
is performed by adjusting the rear focusing section while viewing the scene until the target area is clear
and well defined. Illustrated below is a properly focused Sensor viewing an induction heated rod. The
visible sight rear panel is shown below.
Focuses the Sensor optical
system on the target.
Lens Lock Thumb Screw
Locks the focusing section in
place after focusing.
(Do Not Use Tools)
Rear Protection / Visual Sight
Window. Threads on focusing
section to cover rear panel
display and keypad. Provides
NEMA 4 (IP65) environmental
rating. See note below about
EP-5 window.
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