Temperature Measurement Products

Impac ISR 320 and IGAR 320

Stationary, Digital Ratio Pyrometer for Non-Contact Temperature Measurement, 300 to 2500°C

Advanced Energy's Impac ISR 320 and IGAR 320 pyrometers measure via the two-color (ratio) method.

  • Internal digital signal processing for high accuracy
  • Built-in LED target light for easy alignment
  • Thermal intensity alignment
  • Integrated dirty-window warning
  • Overview
  • Technical Specs
  • Documents
  • Accessories
  • Service & Support
  • Distributors


The Impac® ISR 320 and IGAR 320 use two adjacent wavelengths for temperature determination, which is also known as the two-color (ratio) method.

Using the two-color method, temperature measurement is largely independent of the object’s emissivity. And in wide ranges, measurement is unaffected by dust and other contaminants in the field of view. The measuring object can be smaller than the spot size. Measurements can be made through dirty-viewing windows up to a certain contamination point.


  • Use like a conventional pyrometer when needed by switching to the one-color mode
  • Measure objects smaller than the spot size
  • Store measurement values
  • Easily set up pyrometer parameters
  • Make measurements through dirty-viewing windows


  • Small housing dimensions for easy installation
  • Fast 10 ms response time for dynamic processes
  • RS485 interface for connection to a PC via USB converter or machine control (PLC)
  • Analog output adjustable to 0 to 20 mA or 4 to 20 mA for connection of standard analyzing instruments
  • InfraWin software is included

Select specifications are shown below. Please see product data sheet for additional specifications.

  • Temperature Ranges

    ISR 320

    700 to 1700°C (MB 17)
    900 to 2500°C (MB 25)

    IGAR 320

    300 to 1300°C (MB 13)

  • Measurement

    Spectral Ranges

    ISR320: Channel 1: 0.9 μm | Channel 2: 1.05 μm
    IGAR 320: Channel 1: 1.5 to 1.6 μm | Channel 2: 2.0 to 2.5 μm

    Measurement Uncertainty


    ISR 320: 0.2% of reading in °C + 2°C
    IGAR 320: 0.3% of reading in °C + 2°C
    ε = 1, t90 = 1 s, Tamb. = 25°C

    Exposure Time t90

    10 ms adjustable to min; 0.01 s, 0.05 s, 0.25 s, 1 s, 3 s, 10 s

    Emissivity ε

    0.100 to 1.000 in steps of 1/1000 (one-color mode)

    Emissivity Slope K

    ISR 320: 0.800 to 1.250 in steps of 1/1000 (two-color mode)
    IGAR 320: 0.600 to 2.000 in steps of 1/1000 (two-color mode)

    Transmittance τ

    0.100 to 1.000 in steps of 1/1000 (one-color mode)

  • Optical


    Built-in LED target light and LEDs for intensity alignment


    Two fixed optics

    Distance Ratio (FOV)

    Minimum 100:1 (3 mm)

  • Interface and Communication


    8-pin connector


    Analog Output

    Adjustable 0 to 20 mA or 4 to 20 mA, linear with temperature

    Digital Interface

    RS485 addressable (half-duplex)
    Baud rate: 1200 to 115.2 kBd

    Dirty-Window Warning

    Opto relay contact, max continuous current 0.2 A, 50 VDC, Pmax = 300 mW

  • Environmental

    Protection Class

    IP 65 (DIN 60 529) (value in mated condition)

    Operating Position


    Ambient Temperature

    0 to 70°C (32 to 158°F) at housing

    Storage Temperature

    -20 to 80°C (-4 to 176°F)

    Relative Humidity

    Non-condensing conditions


    0.3 kg (~0.661 lb)


    Stainless steel

    CE Label

    According to EU directives about electromagnetical immunity

  • Electrical

    Power Supply

    24 VDC ± 25%, ripple must be less than 50 mV

    Power Consumption

    Maximum 1 W (including LED)


    0 to 500 Ω


    Power supply, analog output, and digital interface are galvanically isolated from each other

  • Typical Applications

    • Metal induction processes: Hardening, welding, forging, brazing, soldering
    • Metal processes: Noble metals melting and purifying, wire / rod mill water box measurement, laying head and air cooling conv., vacuum processes (e.g., coating, brazing, sintering, etc.)
    • Solar industry: Icon processing polycrystalline casting in vacuum melting furnace, silicon ingot growth in CVD reactors (Siemens process), crystal pulling of monocrystalline silicon (Czochralski process)
    • Glass industry: Gob temperature measurement
    • Cement industry: Clinker temperature measurement

Specifications are subject to change without notice. Not all options and accessories are available for all models and configurations. Dimensions listed generally refer to standard configurations and module bodies only. Please confirm technical specifications and customizations with a sales representative. Advanced Energy is not responsible for errors or omissions.


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Product Support

U.S.: +1 800 446 9167
Asia: +86 29 8874 1895
China: 400 8899 130
EMEA: +44 800 032 1546
U.K.: 08000 321 546

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