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Note: The cooling cavity is isolated from internal surface of explosion-proof
enclosure. See Appendix E Engineering Drawing 613-816, Service Connections.
3.4.2
Vortex Air Cooling
Connect a V208-15-H Vortex Air cooler to the cooling cavity built into the underside of the
explosion-proof enclosure. Provide filtered, dry, compressed air from a minimum 90 psig source
with a sustained flow rate capability of at least 10 SCFM to the vortex air cooler. This will result
in a temperature reduction up to 27 °F (3 °C) lower than the supply air. It is not necessary to over
cool the instrument. Instead, reduce the enclosure temperature to its specified operating limits
by adjusting the upstream pressure to the Vortex Cooler. If over cooling does occur, the heater
built into the system will activate and keep the electronics within limits.
Note: The cooling cavity is isolated from internal surface of explosion-proof
enclosure. See Appendix E Engineering Drawing 613-816, Service Connections.
3.5 Viewport Air Purge Requirements
A source of sustained dry instrument air with a flow rate through a regulator or needle valve
capable of sustaining 1 SCFM flow rate from a 20 psig or greater supply is required to keep the
lens clean.
3.6 Target Size and Focusing Range
The target size of the QUASAR M8100-EXP is a function of the distance from the lens to the
object under observation and the optical resolution set at the factory. The target area is a circle
reticle as viewed through the QUASAR M8100-EXP's sight-through optics. The diameter of the
detection area (Target Size) is represented by the reticle circle and is calculated using the
formula:
Target Size = D
Where D = the distance from the lens to the target.
R
R = the appropriate value from the following table
The resolution of the optics is application-
specific and determined at time of order.
3.7 Focusing on the Target (Adjust Lens)
The objective lens locking and focusing screw and the eyepiece are both located on the top of
the infrared electro-optical package inside the explosion-proof enclosure (see Figure 6).
To focus, first rotate the eyepiece lens (Figure 6, item 1) in or out until the reticle is clear and
sharp. Next, slowly loosen the lens locking and focusing screw (see Figure 6, item 2). Move the
objective lens (see Figure 6, item 3) in or out with the focusing screw until the target is clear and
sharp. Tighten the screw; the focus is now set.
E
T QUASAR Flare Monitors Operation Manual
2
Resolution
37.5
60
75
150
300
Mechanical Installation • 20
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