17
Humidity
Noncontact thermometers (IRTs) are not
intended for use in extremely humid or con-
densing environments. Condensation on the
lens window will impede the optical perform-
ance and prevent accurate temperature meas-
urements. If this occurs, allow the window to
dry by evaporation or wipe with a soft cloth
and resume measurements.
Emissivity
A noncontact thermometer (IRT) determines
temperature by measuring the emitted energy
of an object. Emissivity (E value) is the measure
of an object’s ability to emit infrared energy.
This noncontact thermometer is specially cali-
brated for high emissivity targets and is preset
to an E value of 0.97. This setting is the most
advantageous for capturing the emitted energy
from water, oils, shortening, fat, vegetables, as
well as frozen, partially frozen and refrigerated
products in boxes and plastic containers.
Note:
Shiny metal surfaces (such as polished
or stainless steel) have low emissivities and
reflect the energy of their surrounding, result-
ing in inaccurate temperature readings. The
emissivity of shiny metal surfaces can be
enhanced to provide more accurate readings
by covering the measurement area with mask-
ing tape, flat black paint, or a coating of short-
ing or oil. Blackened cooking surfaces such as
griddles and cast iron pans make good targets.
