Features

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 800°C when powered with 8 watts for the standard IR-12 source 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 glass.

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 identical.

These popular units have been in production since 1980. They are considered rugged and reliable.

Operating Specifications IR-12

	Voltage: 4.5 Volts (AC or DC)
	Temperature: 800°C
	Current: 1.8 Amps
	Power: 8.0 Watts
	Active area: 3.5 mm x 3.5 mm
	Emissivity: 0.80
	Lifetime: 3+ years at 825°C, typical

Operating Specifications IR-12K

	Voltage: 6.0 Volts (AC or DC)
	Temperature: 975°C
	Current: 1.8 Amps
	Power: 11.0 Watts
	Active area: 3.5 mm x 3.5 mm
	Emissivity: 0.80
	Lifetime: 3+ years at 975°C, typical

Spectral Radiance

Spectral radiance output for a perfect black body of various temperatures. The IR-12 and IR-12K produce approximately 80% of these figures in the 1µm to 22µm range.

Ordering Information

Accessories

The combination of the IR-12K and the MC-233 Elliptical reflector creates an output image as shown below. The majority of optical output is concentrated within an approx 8mm circle 12mm from reflector. Please note, the output is easily strong enough to char paper.

By using an IR-12K, an MC-233 elliptical reflector and a piece of fax paper, it is possible to monitor how quickly the IR-12K heats up. Full power is reached approximately 30 seconds from switch on. (Approx 2.5 second exposure at each point.)

Useful Documents

IR Source Series 12 Data Sheet - pdf (75K)