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UV Leak Detector
Inject a small amount of florescent dye into the system under test. The dye/system mixture
(refrigerant, for example) will escape and accumulate at all leak sites. Turn the blue UV LEDs on
in the Setting mode and scan the system. The residue of the dye at the leak can be easily
observed under the UV light. Dyes are available at most HVAC supply outlets.
Locating Hot or Cold Spots
To detect a hot or cold spot, aim the thermometer at a region beyond
the target and then scan the entire region in a slow, up/down motion.
Distance to Spot Ratio (Field of View)
The meter's field of view is 12:1 (distance to spot ratio). For example, if the meter is 60cm (24
inches) from the target (spot), the diameter of the target must be at least 5cm (2 inches). Other
distances are shown below in the field of view diagram.
Note that measurements should normally be made further than 60cm (24 inches) from the
target. The meter can measure from further distances but the measurement may be affected by
external sources of light. In addition, the spot size may be so large that it encompasses surface
areas not intended to be measured.
2.5cm @ 30cm
It is necessary to ensure that the size of the target is larger than the spot size. The smaller the
target, the closer the distance should be.
1" @ 12"
5cm @ 60cm
2" @ 24"
7
IR300UV‐en‐GB_V1.0 1/16
EXTECH INSTRUMENTS
10cm @ 120cm
4" @ 48"
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