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IR Source IR-12 Series

IR12 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 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 glass.

IR12K + MC233 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.

 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.

Operating Specifications IR-12 & IR-12R

Voltage: 5 Volts (AC or DC)

Temperature: 900°C

Current: 2 Amps

Power: 10.0 Watts

Active area: 3.5 mm x 3.5 mm

Emissivity: 0.80

Lifetime: 30,000 hours at 5V, typical

Temperature vs Voltage

IR-12 Temperature vs Voltage


IR-12 Dimensions

Current vs Voltage

IR-12 Current vs Voltage

Power vs Voltage

IR-12 Power vs Voltage

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: 0.70

Lifetime: 30,000 hours at 6V

Temperature vs Voltage

IR-12K Temperature vs Voltage


IR-12K Dimensions

Current vs Voltage

IR-12K Current vs Voltage

Power vs Voltage

IR-12K Power vs Voltage

Spectral Radiance

Blackbody 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


 10 Watt IR Source - 900°C



 11 Watt IR Source - 975°C



 10 Watt IR Source - 900°C



IR12K + MC233 Powered


 Elliptical Reflector (IR-12, IR-12K, IR-21)


 Elliptical Reflector (IR-12, IR-12K, IR-21, IR-21V)


 Parabolic Reflector (IR-12, IR-12K, IR-21)


 Parabolic Reflector (IR-12, IR-12K, IR-21, IR-21V)

 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.

IR12K + MC233 Output IR12K + MC233 Burn Diagram

 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.)

IR12K + MC233 warm up burn diagram

Useful Documents


IR Source Series 12 Data Sheet - pdf (324K)


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