Optris CTex LT IR sensor for Hazardous Areas

Optris CTex


Optris CTex LT

Optris CT miniature sensing head

Single point_interfaces resized 2

Optris CTex LT Infrared Pyrometer for Hazardous Areas

The Optris CTex LT is an intrinsically safe development of the proven CT LT sensor designed for use in hazardous areas. The sensor possesses all of the features of the CT LT but with the addition of ATEX approval for Zone 1 and 2 hazardous areas.
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.

Learn more about the CTex LT in just 60 seconds.


Sensing head as simple electrical device enables
installations in hazardous locations without problems
Energy limitation with appropriate zener barriers
(STAHL) with approval for zone 1 (PTB 01 ATEX 2053/
E II (1/2) GD [EEx ia/ib] IIC/IIB)
One of the smallest infrared sensors worldwide
with 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 analog 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)


Environmental rating: IP 65 (NEMA-4)
Ambient temperature: Sensing head:-20°C to 180°C (130°C for LT02)Electronics: -20°C to 85°C
Storage temperature: Sensing head:-20°C to 180°C (130°C for 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


Temperature range: -50°C to 975°C (LT22)-50°C to 600°C (LT15)-50°C to 600°C (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 (LT22)0.8 mm @ 10 mm (LT15)2.5 mm @ 23 mm (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
0.100 – 1.100 (adjustable via 0-5 V DC
input or software)
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


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/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


Optris-CT-LT-Optical Specifications