CT 3M sensing head

Optris CT LT infrared non-contact temperature sensor

Single point_interfaces resized 2

Optris CT 3M Miniature Infrared Pyrometer

The Optris CT 3M is a miniaturised pyrometer with programmable electronic box for applications which is specifically sensitive to short wavelength infrared making it ideal for the non-contact temperature measurement of metals at very high temperatures from 50°C up to 1800°C.

The sensor has the smallest sensing head available in the world at just 14mm diameter x 28mm long and allows the sensor to be installed in the applications where space is at a premium. The separate electronics enclosure provides a full range of outputs and inputs as standard including Voltage, mA and Thermocouple. It is also possible to incorporate an interface card which provides simple integration into your existing process control equipment. Options include Ethernet, Profibus, RS485 and USB interface and Compact Connect software.
Calibration as well as a full range of accessories are available for the Optris Compact infrared pyrometers.


Miniaturized Infrared Thermometer with 2.3 μm wave length range for measurements of metals, of secondary metal processing, metal oxides and ceramic materials
Very small sensing head of 14 mm diameter and 28 mm long fits anywhere and is usable up to 85°C ambient temperature without cooling
For measurements on metal surfaces with a very low start temperature of 50°C up to 1800°C
Measuring spot sizes up from 1.5mm
Response times up from 1 ms
Short measuring wave length of 2.3 μm reduces error of temperature readings on surfaces with low or unknown emissivity
High flexibility through selectable analogue outputs or various digital interfaces at the electronic box

General Specifications

Environmental rating: IP 65 (NEMA-4)
Ambient temperature: Sensing head:-20°C to 85°C Electronics: 0°C to 85°C
Storage temperature: Sensing head:-40°C to 85°C Electronics: -40°C to 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: sensing head 40g electronics 420g

Measurement Specifications

Temperature range (1): (scaleable via programming keys or software) 50°C to 400°C (3ML) 100°C to 600°C (3MH) 150°C to 1000°C (3MH1) 200°C to 1500°C (3MH2) 250°C to 1800°C (3MH3)
Spectral range: 2.3 μm
Optical resolution CT 1ML/2ML (90 % energy): 22:1 (3ML) 33:1 (3MH) 75:1 (3MH1-H3)
System accuracy: ±(0.3% of reading + 2°C) at ambient temperature (2)
Repeatability: ±(0.1% of reading + 1°C) at ambient temperature (2)
Temperature resolution: 0.1K
Response time (3): 1ms (90%) (2)
Emissivity/Gain : 0.100 – 1.100 (adjustable via 0-5 V DC input or software)
Transmissivity : 0.100 – 1.100 (adjustable via software)
Signal processing: peak hold, valley hold, average; extended hold function with threshold and hysteresis
Software: optris Compact Connect

1) Tobject > Tsensing head + 25°C 2) ε = 1, Response time 1 s 3) with dynamic adaptation at low signal levels

Electrical Specifications

Output/analogue: Channel 1: 0/4 – 20 mA, 0-5/10 V, thermocouple J or K, alarm.
Output/alarm: 24 V/50 mA (open collector)
Optional Alarm Output: relay: 2 x 60 V DC/42 V AC; 0.4 A; optically isolated
Outputs/digital (optional): USB, RS232, RS485, CAN-Bus, Profibus DP, Ethernet
Output impedances: mA max. 500 Ω (with 8-36 V DC) mV min. 100 kΩ load impedance thermocouple 20 Ω
Inputs programmable functional inputs for external emissivity adjustment, ambient temperature compensation, trigger (reset of hold functions)
Cable length: 3m
Current draw: max. 100mA
Power Supply: 8-36 V DC

Optical Specifications






CompactConnect Software

Compact Connect Software