Temperature Measurement Products

Impac ISR 12-LO and IGAR 12-LO Series

Digital, Two-Color Infrared Temperature Sensors, 300 to 3300°C

Advanced Energy's Impac ISR 12-LO and IGAR 12-LO are digital two-color pyrometers with fiber optics for non-contact temperature measurement.

  • Temperature Ranges: Between 300 and 3300°C
  • Analog Output: 0 to 20 mA or 4 to 20 mA switchable, load 0 to 500 Ohm, test current 10 mA by pressing the test key
  • Extremely fast exposure time
  • Very small spot sizes
  • Maximum value storage
  • Overview
  • Technical Specs
  • Documents
  • Service & Support
  • Distributors


The Impac® ISR 12-LO and IGAR 12-LO pyrometers use two adjacent wavelengths to calculate temperature (two-color method). This allows for temperature measurement to be independent of object emissivity in wide ranges and objects can be smaller than spot sizes.

You can switch the pyrometers to one-color mode and use like conventional pyrometers. The metal mode allows measurements of metals and alloys with unknown K-factor (emissivity slope).

The Impac ISR 12-LO/GS series is a special foundry system for pouring stream measurement. It's useful in automatic or semi-automatic pouring machines and displays the temperature after each pouring process.


  • Achieve extremely high accuracy and repeatability
  • Detect lens contamination quickly
  • Adjust parameters at the instrument (ISR 12-LO and IGAR 12-LO only)
  • Accurately measure cast iron pouring streams (ISR 12-LO GS only)
  • Automatically record pouring temperature (ISR 12-LO GS only)


  • Switchable digital interface RS232/RS485
  • Built-in laster targeting light
  • Ratio (two-color), one-color, or metal modes (switchable)
  • Lens contamination control system
  • Test current output for diagnostics
  • Measurements are unaffected by dust and other contaminants in the field of view or by dirty viewing windows


  • Temperature Ranges

    ISR 12-LO

    600 to 1300°C (MB 13)
    750 to 1800°C (MB 18)
    900 to 2500°C (MB 25)
    1000 to 3300°C (MB 33)

    IGAR 12-LO

    300 to 1000°C (MB 10)
    350 to 1300°C (MB 13)
    450 to 1700°C (MB 17)
    500 to 2200°C (MB 22)
    550 to 2500°C (MB 25)

    ISR 12-LO/GS

    600 to 1300°C (MB 13)
    750 to 1800°C (MB 18)
    900 to 2500°C (MB 25)

    Any range adjustable within the temperature range, minimum span 51 °C

  • Measurement

    Spectral Ranges

    ISR 12-LO
    Channel 1: 0.8 µm | Channel 2: 1.05 µm

    IGAR 12-LO
    MB 10: Channel 1: 1.52 µm | Channel 2: 1.64 µm 
    All Other MB: Channel 1: 1.28 µm  | Channel 2: 1.65 µm 

    ISR 12-LO/GS
    0.8 to 1.05 μm

    Measurement Uncertainty

    ISR 12-LO and ISR 12-LO/GS
    0.4% of reading in °C + 1°C (< 1500°C)
    0.6% of reading in °C + 1°C (> 1500°C)

    IGAR 12-LO
    0.5% of reading in °C + 1°C (< 1500°C)
    0.7% of reading in °C + 1°C (> 1500°C)
    The pyrometer must operate at least 30 min before these values are valid

    At K= 1, t90 = 1 s, Tamb. = 23°C


    ISR 12-LO and ISR 12-LO/GS: 0.2% of reading in °C + 1°C
    IGAR 12-LO: 0.3% of reading in °C + 1°C

    Exposure Time t90

    2 ms (with dynamical adaptation at low signal levels), adjustable to 0.01 s; 0.05 s; 0.25 s; 1 s; 3 s; 10 s

    Emissivity ε

    0.1 to 1 (adjustable in steps of 0.001, only in mono mode)

  • Optical


    Laser targeting light (maximum power level < 1 mW, λ = 630 to 680 nm, CDRH class II)
    Measurement is stopped while laser targeting light is switched on


    ISR 12-LO and IGAR 12-LO: Three optical heads
    ISR 12-LO/GS: Two optical heads with line shaped spot
    For additional specifications see data sheets

    Distance Ratio (FOV)

    ISR 12-LO and IGAR 12-LO
    Optics I: 100:1 (2.2 mm)
    Optics II: Minimum 200:1 (0.45 mm)

    ISR 12-LO/GS
    Minimum 210:1 (1.6 mm)

  • Interface and Communication


    Built-in four-digit, seven-segment LED


    Analog Output

    0 to 20 or 4 to 20 mA switchable, load 0 to 500 Ohm
    Test current 10 mA for inspection of wiring and connected instruments

    Digital Interface

    Switchable: RS232 or RS485 addressable, half duplex
    Baud Rate: 2.4 up to 115.2 kBd

  • Environmental Specifications

    Protection Class

    IP65 (according to DIN 40 050)

    Ambient Temperature

    ISR 12-LO and ISR 12-LO/GS Converter Housing: 0 to 60°C (32 to 140°F)
    IGAR 12-LO Converter Housing: 0 to 50°C (32 to 122°F)
    Optical Head: up to 250°C (482°F)

    Storage Temperature

    -20 to 70°C (-4 to 158°F)

    Relative Humidity

    Non-condensing conditions


    Converter: 2.2 kg (~2.20 lb)
    Optical head II: 140 g (~4.94 oz)
    Fiber (2.5 m): 250 g (~8.82 oz)

    CE Label

    According to EU directives about electromagnetic immunity

  • Electrical

    Power Supply

    24 VDC (15 to 40 VDC) or 24 VAC (12 to 30 VAC), 48 to 62 Hz

    Power Consumption

    Maximum 10 W


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

  • Typical Applications

    IS 12-LO and IGAR 12-LO

    Induction Heating, Welding, Casting, Forging, Annealing, Sintering, Rolling Mill, Rotary Kilns, Pouring Stream, Research and Development, Laser Applications

    ISR 12-LO/GS

    Pouring stream and casting and forging

Global Support & Services

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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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