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Steady State IR Thermal Source IR-21V Steady State IR Thermal Source IR-21, IR-21-P-1
Steady State IR Thermal Source IR-22 Steady State IR Thermal Source IR-21 with Reflector

Infrared Source IR-2X Series

Operating Parameters, Diagram, Features, Products

  • Rugged and Reliable
  • Long Life, Stable Properties
  • Supported, Coil Wound
  • Does not require operation in a sealed atmosphere
  • Can be mounted on a circuit board, alternative mounting available
  • Available mounted vertically or horizontally
  • Available on large or small base


IR-21 / IR-21V IR-22 / IR-22V
Voltage, V 5.0 (AC or DC) 5.0 (AC or DC)
Temperature, ° C 800 900
Current, A 0.8 0.8
Power, W 4.0 4.0
Life 30,000 Hours at 5 volts 30,000 Hours at 5 volts
Emissivity, % 80 80
Active Area 1.5 mm X 3.5 mm 1.5 mm X 3.5 mm


IR-21 Emitter Diagram

IR-21V Emitter Diagram


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 4 watts for the IR-21 and 3.4 watts for the IR-22. 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. Due to the reduced mass of this unit it can be pulsed at up to 1 hertz with a resultant temperature variation that can be detected though the depth of modulation is small. For electrically modulated infrared light source operation please see the pulsable sources. The unit does not require operation in a sealed atmosphere.

The header is available in two sizes. The larger, IR-21, has an 8.6 mm (0.341 in) diameter base. The smaller, IR-22, has a 4 mm (0.157 in) diameter base. The support pins, which are also the power leads, are hermetically sealed in glass.

The IR-2X Series is offered in two configurations: the IR-21 and IR-22 have the element mounted horizontally and the IR-21V and IR-22V have the element mounted vertically.


(other options / materials available upon request)

Reflector Parabolic* / Elliptical
(*to achieve optical gain up to 14x)
1" (25.4mm)
Window Transmitting Range (microns)
Sapphire 0.17 - 5.0
CaF2 0.15 - 9.0
ZnSe 0.55 - 20.0
AR Silicon 1.2 -10.0

To learn more about our available accessories, please click here.


Products # IR
Part #
IR-21 IR-21
IR-21V IR-21V
IR-22 IR-22
IR-22V IR-22V
IR-21-P-1 IR-21 Parabolic 1” (25.4 mm) 1" (25.4 mm) IR-RMC234 available
IR-21-E-1 IR-21 Elliptical 1" (25.4 mm) 1" (25.4 mm) IR-RMC233 available
IR-21V-P-1 IR-21V Parabolic 1" (25.4 mm) 1" (25.4 mm) IR-RMC234V available
IR-21V-E-1 IR-21V Elliptical 1" (25.4 mm) 1" (25.4 mm) IR-RMC233v available

* Please indicate Window type in your order.