IR-FA Series

The IR-FA series is a fiber optic radiation thermometer featuring multi-function and high-speed response. Three types, single-color type for low temperature, single-color type for medium/high temperature and two-color type, are available. Parameter setting function, signal modulation and analog output are built in. Various options including lens assembly with finder, laser-spotting function, analog input and communications interface are available.


  • Low temperature type with high-speed response (10ms) and short wavelength enables to measure objects with low emissivity like as metals.
  • Medium/high temperature type with high accuracy (±0.5 to 1% for 1000 to 2000°C) and high-speed response (10ms) is for various temperature measurement fields.
  • Two-color type is stable with less effectiveness of smoke, vapor, dust and lack-of-view.
  • Digital temperature display and settings of parameters by key operation
  • Small and lightweight (90 x 90 x 60mm, about 250g), DIN-rail installation
  • Temperature measurement of inductive heating object, measurement in explosion-proof environment, measurement in vacuum equipment and other measurement are possible.
  • By using heat-resistive fiber optic, measurement the environment at 150°C is possible without any water-cooling.
  • By signal modulation function, the stable temperature measurement is possible.
  • Laser function for easy spotting of measuring point (option)
  • A lens assembly with finder for spotting of measuring point with eyes is available from accessories.
  • By the communications interface (RS-485), the data logging and parameters setting are enabled from a personal computer.
  • Emissivity setting (emissivity ratio for two-color type) by analog input or automatic emissivity computation function is selectable. (option)
  • CE conformance


♦ Thermometers

Elements Models
Cooling type PbS IR-FAC□□□
InGaAs IR-FAI□□□
Si IR-FAS□□□
Hybrid element IR-FAQH□□

Lens assembly

♦ Core diameter 400µm

Measuring diameter/measuring distance Models
Φ1mm at 100mm IR-FL0□□□
Φ12mm at 1000mm IR-FL1□□□
Φ5mm at 500mm IR-FL2□□□
Φ2mm at 200mm IR-FL3□□
Φ4mm at 200mm IR-FL4□□
Φ5mm at 150mm IR-FL5□□
Φ20mm at 600mm IR-FL6□□
Φ8mm at 1000mm IR-FL8□□

♦ Core diameter 800µm (for low temperature)

Measuring diameter/measuring distance Models
Φ10mm at 150mm IR-FL5□□□
Φ40mm at 600mm IR-FL6□□□
Φ13mm at 200mm IR-FL7□□□

Power unit

Name Model
Power unit IR-ZFEP

Standard Ranges

Types Elements Measuring ranges Lens assemblies
Single-color Cooling type PbS 70 to 250°C IR-FL5□,IR-FL6□,IR-FL7□core dia 800µm)
100 to 300°C
250 to 800°C IR-FL0□,IR-FL1□,IR-FL2□,IR-FL3□,IR-FL4□(core dia 400µm)
150 to 500°C IR-FL5□,IR-FL6□(core dia 400µm)
250 to 800°C
InGaAs 150 to 450°C IR-FL5,IR-FL6
200 to 700°C
250 to 1000°C
300 to 1300°C
250 to 1000°C IR-FL0,IR-FL1,IR-FL2,IR-FL3,IR-FL4,IR-FL8
300 to 1300°C
350 to 1600°C
Si 400 to 900°C IR-FL5,IR-FL6
500 to 1200°C
600 to 1800°C
700 to 2400°C
600 to 1800°C IR-FL0,IR-FL1,IR-FL2,IR-FL3,IR-FL4,IR-FL8
700 to 2400°C
800 to 3000°C
2-color type Hybrid element 500 to 1000°C IR-FL5,IR-FL6
600 to 1500°C
700 to 2000°C
1000 to 2400°C
600 to 1500°C IR-FL0,IR-FL1,IR-FL2,IR-FL3,IR-FL4,IR-FL8
700 to 2000°C
800 to 2400°C
1000 to 3000°C


♦ Thermometer

Measuring system Single color type Two- color type
Element PbS (cooling type) InGaAs Si Hybrid Element
Wavelength 2.0µm 1.55µm 0.9µm 0.9 / 1.55µm
Accuracy ratings 70°C to 300°C: ±4°C
300°C to 500°C: ±5°C
Higher than 500°C: ±1.0 % of measured value
Lower than 1000°C: ±5°C
1000°C to 1500°C: ±0.5% of measured value
1000°C to 1500°C: ±0.5% of measured value
1500°C to 2000°C: ±1.0% of measured value
Higher than 2000°C: ±2% of measured value
Resolution 70°C to 100°C: About 3°C
100°C to 200°C: About 3°C
Higher than 200°C: About 0.5°C
0.5°C 1.0°C
Response time 0.01 second 0.04 second
Emissivity (ratio) compensation 1.999 to 0.050 (*1) Emissivity: 1.999 to 0.050 Emissivity ratio: 1.999 to 0.050
Signal modulation DELAY,PEAK
Display LCD 4-digit (Temperature display, parameter display), °C/°F (key selection)
Analog output 4 to 20mADC isolated output (load resistance: 500Ω or lower)
Contact output 2-point 1-point
Contact input 1-point, peak hold reset or sample hold, Dry contact or open collector
Parameter setting by keys Operator mode and Engineering mode
Working temperature 5 to 40°C 0 to 50°C
Rated power supply 24VDC (Allowable voltage fluctuation range: 22 to 28VDC), Recommended power unit: IR-ZFEP
Power consumption Maximum 15VA Maximum 3VA
Mounting DIN rail mounting or wall mounting
Outside Dimensions, Weight W140 x H110 x D65mm About 1.0kg W90 x H90 x D60mm. About 250g
CE EN61326 + A1
Emission: Class A
Immunity: Table A.1
Stability under EMC test environment ±10°C ±10°C or ±1% of measuring range, whichever is larger
Condition of CE conformance See Note *2.       
*1: The effective compensation range is e = 1.0 to 0.8 for the measured temperature of 70 to 80°C and ε = 1.0 to 0.6 for 80 to 90°C.

*2: Condition of CE conformance for IR-FAC
(1) The connection cable is up to 30m.
(2) An individual DC power unit for thermometer is required. (Recommended power unit: IR-ZFEP)
(3) All of the thermometer, the connection cable, and a DC power unit should be used indoors.

♦ Fiber optics

Core 400µm Core 800µm (IR-FAC)
Fiber optics Single core quartz
Sheath Without metallic protective tube (Heat resistive sheath/glass wool braid)
With metallic protective tube (Heat resistive sheath/glass wool braid + SUS flexible tube)
Working temp. 0-150°C 0-50°C at measured value of 70-120°C 0-80°C at measured value of 120°C or higher
Length 4m (standard) for IR-FAC (max.5m)
Specify 2-50m for IR-FAI, S or QH
Allowable bending R100mm R150mm

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