This infrared light source is a thermal emitter with an emissivity of ~80%. It is appropriate for use in laboratory or field instrumentation due to its long life and stable properties.
The coiled filament operates at 975°C when powered with 11 watts. The radiating element is a coiled resistance wire which has a high emissivity in the infrared spectral region. The coil is supported on a cylindrical substrate of alumina, resulting in the windings being electrically insulated from each other. This contributes to a more uniform radiating source. The unit does not require operation in a sealed atmosphere. The header which is fabricated from cold-rolled steel has a diameter of 8.6 mm. The support pins, which are also the power leads, are hermetically sealed in glass.
The IR-12K uses Kanthal resistance wire for operation at high temperatures. Apart from the wire used, the IR-12 and IR-12K are identical.
These popular units have been in production since 1980. They are considered rugged and reliable.
An interactive pdf data sheet is available for all Hawkeye IR sources ( 8 MB ):