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7.3. Locating a hot Spot
To find a hot spot aim the thermometer outside the area of
interest, then scan across with an up and down motion until you
locate hot spot.
Reminders
1. Not recommended for use in measuring shiny or polished
metal surface (stainless steel, aluminium, etc.) See
emissivity.
2. The unit cannot measure through transparent surfaces such
as glass. It will measure the surface temperature of the glass
instead.
3. Steam,
measurement by obstructing the unit's optics.
7.4 Emissivity
Most (90 % of typical applications) organic materials and painted
or oxidised surfaces have an emissivity of 0,95 (pre-set in the
unit). Inaccurate readings will result from measuring shiny or
polished metal surfaces. To compensate, cove the surface to be
measured with masking tape or flat black paint. Allow time for
the tape to reach the same temperature as the material
underneath it. Measure the temperature of the tape or painted
surface.
dust,
smoke,
etc.
can
-25-
prevent
accurate
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