CT 3M

The Optris CT 3M is a reliable solution for non-contact temperature measurement, particularly excelling in handling challenging materials in low-temperature environments, with a focus on metal applications. Engineered to operate consistently in demanding industrial settings, this IR thermometer covers a wide temperature range from 50 °C to 1800 °C (122 °F to 3272 °F).

At the core of the Optris CT 3M lies an extended InGaAs detector operating at a 2.3 µm wavelength, enabling precise temperature measurements of metals, secondary metal processing, metal oxides, and ceramic materials. With temperature measuring ranges from 50 °C to 1800 °C (122 °F to 3272 °F) and exposure times as brief as 1 ms, the Optris CT 3M delivers exceptional accuracy and speed. The pyrometers short-wavelength spectral sensitivity minimizes measurement deviations resulting from changing emissivity, ensuring reliable performance across various materials and environments.

Designed to adapt seamlessly to various temperature requirements, the Optris CT 3M offers versatility for industrial settings. Whether it’s the 3ML model suited for temperatures between 50 °C to 400 °C (122 °F to 752 °F) or the 3MH3 model reaching up to 1800 °C (3272 °F), there’s an option to meet most temperature requirements, providing a reliable and adaptable solution for diverse industrial needs.

With a distance-to-spot size ratio supporting up to 75:1, the CT 3M ensures precise temperature measurements even from a distance. The infrared sensors compact size makes it suitable for integration into heavy machinery, while its rapid response time of just 1 ms enables monitoring of fast processes, offering quick and accurate measurements in industrial environments with low cycle times.

Featuring a two-piece sensor design comprising a measuring head and a separate electronic box, the Optris CT 3M prioritizes accuracy and versatility. The electronic box simplifies device configuration and offers various interface options, including analog and digital outputs such as 0/4 – 20 mA, 0 – 5 V, 0 – 10 V, thermocouple (type K or J), USB, RS485, RS232 interfaces, relay outputs (2 x optically isolated), Profibus DP, ProfiNet, and Ethernet, Ethernet/IP.

Whether in laboratory, factory, or field settings, the Optris CT 3M facilitates accurate temperature measurements with ease. The pyrometers compact sensing head, measuring 14 mm in diameter and 28 mm in length, withstands ambient temperatures of up to 85 °C (185 °F) without additional cooling.

Optional accessories further enhance the functionality of the infrared sensor, catering to diverse industrial needs. The mounting fork ensures secure and stable installation for continuous temperature monitoring, while the sighting tube enhances targeting precision and accuracy. The close-focus lens allows for detailed temperature measurements on small or distant objects, and the air purge accessory protects the temperature sensor from contaminants in harsh environments. Cooling jackets optimize performance in elevated temperature conditions, ensuring consistent and accurate readings. These optional accessories expand the versatility of the Optris CT 3M series, providing tailored solutions for various industrial scenarios.

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?

On the model CT 3M, the sensing head cable can be shortened by max. 3 m (9.8 ft)

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 fill out the optics field of view. 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 0.92. 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?

In 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. Any sensing heads and electronics exchange is possible inside a certain model group. Every head has a specific calibration code, which is printed on the head cable. This calibration code must be stored in the electronic box for correct temperature measurement and sensor functionality.

Can I use the CT 3M as a 2-wire sensor?

Please do not connect a supply voltage to the analog outputs, as this will destroy the output. The CT 3M is not a 2-wire sensor. Please review the CSmicro series, as this is a two-wire sensor.

• CT 3M with 3m (9.8 ft) cable
• 1x mounting nut
• CT Series Manual