Optris CTratio 1M Ratio Pyrometer


Optris CTratio 1M Infrared Ratio Pyrometer

The CTratio is an innovative pyrometer for the measurement of metals in applications where there may be fumes and dust present and where the lens may become soiled over time. It is also possible to measure objects that do not completely fill the sensing spot, in fact they may be as small as just 5% of the measuring spot area and this makes it ideal where a complete view of the object is difficult or for fast moving applications.

It is easy to connect our innovative USB interface which allows simple configuration and on screen measurement with the included Compact Connect Windows software.

Calibration as well as a full range of accessories are available for the Optris High Performance infrared pyrometers.


Measuring range: 700 to 1800°C
5 ms fast temperature measurements of hot objects
Due to ratio principle insensitive to certain dust and partially observed targets; in general suppression of object emissivity changes
Rugged sensing head withstands 250°C without cooling
Built-in laser marks the actual spot size at any distance
Programmable 1 or 2 colour mode

General Specifications

Environmental rating: IP 65 (NEMA-4)
Ambient temperature: Sensing Head: -20°C to 250°C (70°C with laser ON) Electronics: 0 – 85°C
Storage temperature: Sensing Head: -40°C to 250°C Electronics: -40 – 85°C
Relative humidity: 10 – 95%, non condensing
Vibration: IEC 68-2-6: 3 G, 11-200 Hz, any axis
Shock: IEC 68-2-27: 50 G, 11 ms, any axis
Weight: Fibre cable (3m) with head: 375 g, electronics: 420 g

Measurement Specifications

Temperature range: 700°C to 1800°C (scalable via programming keys or software)
Spectral range: 0.7 – 1.1 μm
Optical resolution (90 % energy): 40:1
System accuracy: ± (0.5% of reading + 1°C) (at ambient temperature 23 ±5°C)
Repeatability: ± (0.2% of reading + 1°C) (at ambient temperature 23 ±5°C)
Temperature resolution (NETD): 0.1 K
Response time (90%): 5 ms – 10 s (95 %)
Slope: 0.800 – 1.200 (adjustable via programming keys or software)
Emissivity: 0.050 – 1.000 (adjustable via programming keys or software)
Signal processing: 1 colour/2 colour mode, attentuation monitoring/alarms, hold, valley hold, average; extended hold function with threshold and hysteresis
Software: optris Compact Connect (for configuration only)

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

Electrical Specifications

Output/analogue: 0/4 – 20 mA, 0-5/10 V
Output impedances: mA max. 500Ώ (with 5-36 V DC) mV min. 100 kΏ load impedance
Optional: relay: 2 x 60 V DC/42 V ACeff; 0.4 A; optically isolated
Digital Interface (optional): USB (Only for Programming)
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
Fibre optics length: 3m (standard), 6m, 10m, 15m, 22m stainless steel armour
Current draw: max. 200 mA
Power supply: 8 – 36 V DC or USB powered
Aiming laser: Laser 650 nm, 1mW, ON/OFF via electronic box or software
Power supply: 8 – 36 V DC
Laser 635 nm: 1mW, ON/OFF via electronic box or software

Optical Specifications

CTratio Optical Specifications


CTratio Dimensions

Compact Connect Software

Compact Connect Software