CThot LT

The Optris CThot LT pyrometer is engineered to thrive in extreme conditions within high-temperature environments, boasting exceptional temperature resistance of the sensing head. Operating in ambient temperatures of up to 250 °C without additional cooling presents no challenges for this infrared thermometer, making the pyrometer particularly suitable for integration into machines across various applications, including dryers, furnaces, heat-treating processes, plastics and textiles processing, and semiconductor production.

The Optris CThot LT series offers temperature measurement capabilities ranging from –40 °C to 975 °C with a response time starting from 100 ms. Selectable 10:1 or 2:1 optics and a compact sensor head size further enhance its versatility.

The separate control box of the CThot LT provides high variability with selectable analog outputs and several digital interfaces. Its unique advantages for installation in applications with high surrounding temperatures stem from a robust and ambitious design, allowing operation of the sensing heads for temperatures up to 250 °C without additional cooling. The compact stainless steel housing, measuring 29 mm in diameter and 55 mm in length, ensures durability in harsh conditions. The infrared pyrometer minimizes thermal gradients along the sensor head, optimizing thermal shock resistance for accuracy and repeatability in rapidly changing ambient temperatures.

Manufactured in Germany to meet stringent quality requirements, these pyrometers undergo meticulous calibration to government standards such as PTB or NIST. Customization options, including different cable sizes, are available for large-quantity OEM customers. Optris offers comprehensive support, including consultation on industrial applications and after-sales assistance. Additionally, upon request, the IR thermometers can be provided in an explosion-safe design with an ATEX certificate.

The Optris CThot LT series sets an industrial standard for non-contact temperature measurement, emphasizing precision and speed. Featuring a two-piece design, an optical resolution of up to 10:1, and a rapid exposure time of down to 100 ms, this infrared thermometer is optimized for efficient monitoring across diverse industrial applications. Its exceptional temperature resistance, precise non-contact temperature measurement, and adaptability underscore its utility and reliability in critical industrial processes. Optional accessories, such as mounting forks, sighting tubes, close-focus lenses, air purge accessories, and cooling jackets, further enhance its functionality, offering tailored solutions for varied industrial scenarios. In summary, the Optris CThot LT series pyrometer combines precision, adaptability, and durability to facilitate non-contact temperature measurements in diverse industrial applications.

The Optris CompactConnect software improves the functionalities of Optris fixed infrared pyrometers, offering various monitoring, analysis, and control features beyond basic temperature measurement. It includes features like visualizing temperature trends with temperature-time diagrams and documentation. The software enables data logging, automatic process controls, parameterization of the pyrometer via configuration settings, and setting up programmable outputs and inputs. Additionally, it provides advanced signal-processing functionalities. Compact Connect The Optris IR mobile allows users to set up and commission an Optris infrared pyrometer or infrared camera with an Android smartphone or tablet. This tool becomes handy for commissioning and aligning the infrared cameras field of view or adjusting the configuration. The app analyzes the connected infrared cameras live infrared image stream with auto hot and cold spot detection. For pyrometers, a temperature-time diagram or the video signal is displayed. This app works on most Android devices running 5.0+ with a USB port supporting USB-OTG (On The Go). Google Play

Can I shorten the cable between the sensor head and the electronics box?

It is recommended not to change the sensing cable length, as the cable’s impedance is part of the sensor calibration. However, in all CThot LT models, the sensing head cable can be shortened if absolutely necessary. Shortening the cable will cause an additional measuring error of about 0,1 K/m.

What distance-to-spot size ratio is correct for the application?

The measuring object’s size and the infrared thermometers optical resolution determine the maximum distance between the sensing head and the measuring object. To prevent measuring errors, the object should completely fill out the field of view of the optics. Consequently, the spot should always be at least the same size as the object or should be smaller than that.

Which changes have to be selected if an external close-focus lens is used?

The optional CF lens allows the measurement of small objects. If the CF lens is used, the transmission has to be set to 0.78. The assigned transmission (average value) is a characteristic value that may have a certain scattering. If required, the transmission has to be determined experimentally.

How can I improve the noise amplitude of the sensor?

On the CT models, the head cable must not be moved during the measurement. Use shielded cables only. The sensor shield has to be grounded. Avoid ground loops and related signal interferences in industrial environments. It might be necessary to interrupt the ground connections inside the electronics box. To do this, switch the jumper inside the electronics box to another position. Review the manual.

How do I exchange the sensor head?

From the factory side, the sensing head has already been connected to the electronics and the calibration code has been entered. Inside a certain model group, any exchange of sensing heads and electronics is possible. Every head has a specific calibration code, which is printed on the head cable. For correct temperature measurement and sensor functionality, this calibration code must be stored in the electronic box.

Can I use the CThot LT as 2-wire sensor?

Please do not connect a supply voltage to the analog outputs as this will destroy the output. The CThot LT is not a 2-wire sensor. Please review the CSmicro series as this is a two-wire sensor.

Can you connect two pyrometers to the same computer?

Yes, this is possible. For using the software CompactPlusConnect or CompactConnect (depends on which type of pyrometers you are using) you have to create different instances of the software. You can connect two pyrometers via the USB ports. It is also possible to connect the two pyrometers with a RS485 interface. You can connect the first pyrometer via the provided RS485-USB adapter to the PC.

• CThot LT with 3m cable
• 1x mounting nut
• CT Series Manual