Optris CT LT infrared non-contact temperature sensor

Optris CT miniature sensing head

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Optris CT LT Miniature Infrared Pyrometer

The Optris CT LT is an excellent general purpose miniaturised pyrometer with programmable electronic box. The IR sensing head is suitable for use at ambient temperatures of up to 180°C without cooling and with a choice of optical resolutions there is certain to be a version within the range to suit your application.
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 configurable outputs 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. The CT LT is available from stock so we can supply your sensor quickly too!

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

Learn more about the CT LT in just 60 seconds.


One of the smallest infrared sensors worldwide with up to 22:1 optical resolution
Rugged and usable up to 180°C ambient temperature without cooling
Separate electronics with easy accessible programming keys and LCD backlit display
Selectable analogue output: 0/4-20 mA, 0-5 V, 0-10 V, thermocouple type K or J
Optional USB, RS485, RS232 interface, relay outputs (2 x optically isolated), CAN-Bus, Profi bus DP, Ethernet
Installation of up to 32 sensing heads via RS485
CTex: Explosion proof version (ATEX)

General Specifications

Environmental rating: IP 65 (NEMA-4)
Ambient temperature: Sensing head:-20°C to 180°C (130°C for CT LT02)Electronics: -20°C to 85°C
Storage temperature: Sensing head:-20°C to 180°C (130°C for CT LT02)Electronics: -20°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: -50°C to 975°C (CT LT22)-50°C to 600°C (CT LT15)-50°C to 600°C (CT LT02)(scalable via software)
Spectral range: 8 – 14 μm
Optical resolution (90 % energy): 22:1 (precision glass optics)15:1 (precision glass optics)2:1 (with flat front window)
CF-lens (optional): 0.6 mm @ 10 mm (CT LT22)0.8 mm @ 10 mm (CT LT15)2.5 mm @ 23 mm (CT LT02)
System accuracy: ± 1% or ± 1°C at ambient temperature (1), (2)
Repeatability: ± 0.5% or ± 0.5°C at ambient temperature (1), (2)
Temperature resolution (display): 0.1°C
Response time (95%): 150ms
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) object temperature > 0°C; whichever is greater

2) at ambient temperature 23 ± 5°C

Electrical Specifications

Output/analogue: channel 1: 0/4 – 20 mA, 0-5/10 V, thermocouple J or Kchannel 2: sensing head temperature (-20°C – 180°C as 0-5 V or 0-10 V), alarm output
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 impedancethermocouple 20 Ω
Inputs programmable functional inputs for external emissivity adjustment, ambient temperature compensation, trigger (reset of hold functions)
Cable length: 1 m (standard), 3 m, 8 m, 15 m
Current draw: max. 100mA
Power Supply: 8-36 V DC

Optical Specifications

Optris-CT-LT-Optical Specifications