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 900°C when powered
with 10 watts for the standard IR-12 and IR-12R sources or 975°C when powered with 11
watts for the IR-12K. 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
The IR-12 part uses a high
stability wire where as the IR-12K uses Kanthal resistance wire for operation
at higher temperatures. Apart from the wire used, the IR-12 and IR-12K are
The IR-12R is a standard IR-12 fabricated with the header flange in the reverse direction.
These popular units have been in production since 1980.
They are considered rugged and reliable.