optris BR 20AR, Operator'S Manual

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The accuracy of the measurement can be increased to ±0.5 °C by using the optional BR 20AR ambient
reference black body.

Eyewear and sunglasses are opaque in the 8-
14 μm infrared spectral range. Therefore they should
be removed before the individual screening. Contact lenses need not be removed as these do not
cover the tear duct.
4.5 Influences on external skin temperatures

Medications including aspirin, acetaminophen/ paracetamol and ibuprofen or other antipyretics will
reduce the human core and also skin temperature and make it impossible for screening a fever
condition.

The evaporative cooling effect from perspiration will decrease outside skin temperatures particularly
when a subject is positioned below air flow vents. Subjects visibly perspiring will not deliver
temperature measurements useful for fever screening with an IR camera or any remote infrared
device.

Vascular dilatation can occur after alcohol consumption increasing skin temperatures.

High blood pressure, pregnancy and other physical conditions can also result in increased skin
temperature.