The Smartec infrared sensor type SMTIR9902SIL is a standard Smartec
SMTIR9902 sensor equipped with a silicon lens for measuring radiation
temperatures within a small angle of view (7.27°). The SMTIR9902SIL
contains a NI1000 temperature sensor for measuring the temperature of
the sensor itself. The temperature range of this internal sensor is – 20
to 100 °C. The sensor is mounted in a modified TO-05 encapsulation.