Temperature Measurement Products

Impac ISR 50-LO

Digital, Two-Color Infrared Infrared Thermometers, 700 to 3000°C

Advanced Energy's Impac ISR 50-LO is a digital, two-color pyrometer with fiber optic for non-contact temperature measurement on metals, ceramics, graphite, etc.

  • Temperature Ranges: Between 700 and 3000°C
  • Short exposure time
  • Very small spot sizes
  • Built-in LCD display
  • Digital interface RS232 / RS485 (switchable)
  • Overview
  • Technical Specs
  • Documents
  • Accessories
  • Service & Support
  • Distributors


The Impac® ISR 50-LO is a digital, highly accurate two-color pyrometer with fiber optic for non-contact temperature measurements in temperature ranges between 700 and 3000°C. The pyrometer measures in the two-color principle (ratio principle) in which two adjacent wavelengths are used to calculate the temperature. Additionally, this pyrometer can be switched to one-color mode and used like a conventional pyrometer. 


  • Adjust all settings at the instrument or via interface
  • Utilize test current output for diagnostics
  • Measure objects smaller than the spot size
  • Eliminate worry about dust or other contaminants affecting your measurements
  • Digitally display and store temperature readings


  • Heavy duty fiber connector for rough application conditions
  • Short exposure time
  • Very small spot sizes
  • Built-in lens contamination control system
  • Built-in LCD display

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

  • Temperature Ranges

    ISR 50-LO

    700 to 1800°C (MB 18)
    800 to 2500°C (MB 25)
    1000 to 3000°C (MB 30) 
    Any range adjustable within the temperature range, minimum span 51°C


  • Measurement

    Spectral Ranges

    Channel 1: 0.9 µm
    Channel 2: 1.05 µm

    Measurement Uncertainty

    Up to 1500°C: 0.5% of measured value in °C + 2°C
    Above 1500°C: 1% of measured value in °C
    ε = 1, t90 = 1 s, Tamb. = 23°C


    0.2% of measured value in °C + 2°C
    ε =1, t90 = 1 s, Tamb. = 23°C

    Exposure Time t90

    10 ms; adjustable to 0.01 s; 0.05 s; 0,25 s; 1 s; 3 s; 10 s

    Emissivity ε

    5 to 100% adjustable in steps of 0.1%

  • Optical


    Four-fixed optics

    Distance Ratio (FOV)

    Minimum 200:1 (minimum 1.7 mm)

  • Interface and Communication


    Internal LC display for temperature indication or parameter settings


    Adjustable or readable at the instrument or via interface: Measuring temperature, operation mode (ratio/ mono), emissivity slope or emissivity, exposure time, clear times for maximum value storage, hold function, analog output 0 to 20 or 4 to 20 mA, temperature sub range, switch-off level, contamination limit, RS485 address, baud rate, RS485 wait time, temperature display in °C or °F, error status, maximum internal temperature

    Analog Output

    0 to 20 mA or 4 to 20 mA (linear), switchable; test current 10 mA or 12 mA by pressing test key

    Digital Interface

    RS232 or RS485 addressable (half duplex), switchable
    Baud Rate: 1200 up to 115200 Bd

  • Environmental

    Protection Class

    IP65 (DIN 40050)

    Ambient Temperature

    0 to 50°C on the converter; 0 to 250°C on side of the optical head

    Storage Temperature

    -20 to 60°C

    Relative Humidity

    Non-condensing conditions


    Converter: ~600 g (~1.32 lb)
    Optical Head: ~140 g (~0.31 lb)
    Fiber (2.5 m): ~630 g (~1.39 lb)

    CE Label

    According to EU directives about electromagnetic immunity

  • Electrical

    Power Supply

    24 VDC (18 - 36 VDC), ripple < 500 mV

    Power Consumption

    Maximum 1 W


    0 to 500 Ω


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

    Switch Contact

    Switch contact for dirty window alarm 0 to 500 Ω
    Opto Relay (AC / DC): max switch current: 0.5 A; max switch supply 60 VAC / DC

  • Typical Applications

    • Induction heating
    • Annealing
    • Welding
    • Forging
    • Sintering
    • Melting
    • Rolling mill
    • Rotary kilns
    • Pouring stream
    • Research and development
    • Laser application

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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Global Support & Services

Maximize fab productivity and capital equipment ROI with world-class support through each product lifecycle stage — from startup to long-term operation. Our service offerings are based on more than three decades of precision power and applications expertise.

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Applications Support & Consulting

Accelerate tool installations and process development programs, or address specific applications concerns with Advanced Energy's dedicated applications consultants and engineering staff. Benefit from on-site reviews, analyses, and consultations.

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Decrease variability in maintenance costs and provide additional cost protection. Advanced Energy offers whole-box extended warranties.

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Product Support

Inside the U.S.: 1.800.446.9167 (option 2)
Outside the U.S.

Thin Film Support
Thermal Product Support
Other Technical Support


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