Infrared thermometers and thermal imagers - Optris products
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Ratio pyrometer optris CTratio 1M for high-temperature measurement of metals

Due to its short measuring wavelength the ratio pyrometer optris CTratio 1M is especially suited for measurement of extremely high metal temperatures and its very short response time allows for surveillance of very fast processes.

The ratio pyrometer is largely resistant against dust, steam and dirty observation windows. This allows for an accurate measurement in cases of window soiling of up to 90 percent. The pyrometer additionally measures reliably in cases where the measuring object only covers 5 percent of the measuring point or moves very fast.

Due to the fiber optic cable and the separate electronics box the ratio pyrometer furthermore allows employment in ambient temperatures of 200 °C without additional cooling and without influencing measurement results.

Important specifications

  • Temperature range:
    700 °C to 1,800 °C
  • Spectral range: 0.7 - 1.1 µm
  • Response time: 5 ms - 10 s
  • Starting at £2230

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Technical Details of the optris CTratio 1M


Measurement Specifications


  • Temperature range (scalable via programming keys or software): 700°C ... 1,800°C
  • Spectral range: 0.7 - 1.1 µm
  • Optical resolution (90% energy): 40:1 (1ML)
  • System accuracy1) (at Tamb= 23 ± 5°C): ± (0,5 % of reading +1 °C) 
  • Repeatability (at Tamb = 23 ± 5°C): ± (0,3 % of reading
  • Temperature resolution (>900°C): 0.1 K
  • Exposure time (95% signal)2): 5 ms - 10 s
  • Slope (adjustable via programming keys or analog input): 0.800 - 1.200
  • Emissivity (adjustable via programming keys or analog input): 0.050 - 1.000
  • Signal processing (parameter adjustable via programming keys or software, respectively): 
    1 color / 2 color mode; attenuation monitoring / alarms; peak hold, valley hold, average, extended hold function with threshold and hysteresis


General Specifications


  • Environmental rating: IP 65 (NEMA-4)
  • Ambient temperature: 
    sensing head: -20°C ... 200°C (optional to 315°C)
    electronics: 0°C ... 60°C
  • Storage temperature:
    sensing head: -40°C ... 200°C
    electronics: -40°C ... 85°C
  • Relative humidity: 10 - 95%, non condensing
  • Vibration (sensor): IEC 60068-2-6 (sinus shaped), IEC 60068-2-64 (broad band noise)
  • Shock (sensor): IEC 60068-2-27 (25G and 50G)
  • Weight:
    Fibre cable (3 m) with sensing head: 375 g
    electronics: 420 g


Electrical Specifications


  • Outputs / analog: 0/4 - 20 mA, 0 - 5/10 V
  • Digital interface (optional): USB (only for programming)
  • Optional: Relay: 2 x 60 V DC/42 V ACeff; 0,4 A; optically isolated
  • Output impedances:

    mA max. 500 Ω (with 5 - 36 V DC)
    mV min. 100 kΩ load impedance

  • I/O-Pins: Two programmable in-/outputs;selectable as alarm output (open collector 24 V/1 A), input for triggered signal output and peak hold function or as analog input for external emissivity or slope adjustment
  • Fibreoptics length: 3 m (standard), 8m, 15 m
  • Power supply: 8-36 V DC
  • Current draw: max. 200 mA
  • Aiming Laser: Laser 650 nm, 1 mW, ON/OFF via electronic box or software




Part number: temperature range / spectral range

  • OPTCTRA1MB: 700-1800°C / 0.7 - 1.1 μm

1) ε = 1, response time 1 s
2) with dynamic adaptation at low signal levels

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Areas of application for the ratio pyrometer optris CTratio 1M

The special feature of the optris CTratio 1M allowing it to deliver reliable measuring data even through heavy soiling and acquiring data even with low visibility of the measuring objects - makes it an ideal device for temperature control of the hard-to-access processing of metals.

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Infrared software optris Compact Connect included

The temperature analysis software optris Compact Connect has been developed specifically for the extensive documentation and analysis of temperature measurement data of our stationary infrared thermometers. It is license-free and included in every pyrometer shipment.    

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