Optris CT Fast

Optris CT LT infrared non-contact temperature sensor

Optris CT miniature sensing head

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Optris CTfast LT Miniature Infrared Pyrometer

The Optris CTfast LT is an excellent general purpose miniaturised pyrometer with programmable electronic box for applications that demand the fastest possible response time. The Ctfast is capable of measuring temperature changes within 6ms (90% measurement) making it ideal for fast changing or fast moving applications.

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.


One of the smallest infrared sensors worldwide with extremely short response time down to 6 ms (90 % signal)
Fast analogue output (0/4 – 20 mA, 0 – 5/10 V) with smart real time data processing
Instant digital 0/10 V output with a response time of 4 ms (50% signal)
Continuous process monitoring with an unchoppered sensor system
Easy to assemble in multiple arrays for line scanning of small and fast objects (hot spot detection) using a RS485 bus communication
Rugged up to 120°C ambient temperature without cooling

General Specifications

Environmental rating: IP 65 (NEMA-4)
Ambient temperature: Sensing head:-20°C to 120°CElectronics: -20°C to 85°C
Storage temperature: Sensing head:-40°C to 120°CElectronics: -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 40gelectronics 420g

Measurement Specifications

Temperature range: -50°C to 975°C(scaleable via programming keys or software)
Spectral range: 8 – 14 μm
Optical resolution (90 % energy): LT15F 15:1LT25F 25:1
System accuracy: ± 1% or ± 2°C at ambient temperature (1), (2)
Repeatability: ± 0.75% or ± 0.75°C at ambient temperature (1), (2)
Temperature resolution (display): LT15F 0.2K (2), (3)LT25F 0.4K (2), (3)
Response time (4): analog output (90%):LT15F 9 msLT25F 6 ms
analog output (90%):LT15F 9 msLT25F 6 ms
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) whichever is greater with dynamic noise compression

2) at object temperatures 20°C

3) at time constant 100 ms with smart averaging and Tobj 25°C

4) with dynamic adaption at low signal levels

Electrical Specifications

Output/analogue: channel 1: 0/4 – 20 mA, 0-5/10 V, thermocouple J or K
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