Xi 640 LT USB

The Optris Xi640 LT USB is a high-resolution thermal camera that integrates the functions of a thermal imager and a pyrometer within a compact, durable structure. This thermal camera is designed for industrial settings requiring reliable, continuous temperature monitoring. Operating in the long-wave infrared spectrum from 8 to 14 µm, the camera measures surface temperatures ranging from –20 °C to 900 °C. These specifications enable its use in manufacturing, quality control, research, and process optimization, where non-contact and precise temperature measurement is necessary. The VGA detector resolution of 640 × 480 pixels generates detailed thermal images, facilitating accurate analysis of spatial temperature distribution. A 32 Hz frame rate enables real-time imaging, supporting the detection and analysis of rapid temperature changes and subtle thermal variations.

The Xi640 LT USB utilizes an uncooled microbolometer detector, providing a robust, cost-effective, and low-maintenance alternative to traditional cooled infrared detectors and line scanners. The thermal camera supports a range of optics, from wide-angle to telephoto, allowing adaptation to different installation distances and target sizes. Optics are factory-aligned and fixed, while the integrated motorized focus is adjustable remotely via the PIX Connect software. This software manages visualization, configuration, optical distortion correction, and advanced functions such as line scanning, image merging, and automated hot spot detection. To ensure measurement accuracy, the Xi640 employs a 4×4 pixel minimum field of view criterion, which defines each measurement area and supports reliable temperature readings.

The thermal camera is engineered for integration into industrial control systems. It operates via USB power. The process interface accommodates both analog and digital inputs and outputs, which can be configured to transmit measurement data, trigger alarms, or synchronize with external equipment. Inputs facilitate emissivity adjustment, triggered recordings, and other control functions. Dedicated software toolkits are available for developers to integrate the Xi640 LT USB into custom monitoring or control applications.</p>

The Xi640 LT USB

is constructed to operate reliably in demanding environments. Its stainless steel housing is rated IP67, providing protection against dust and water. The compact dimensions of 36 × 100 mm and a weight of approximately 220 g facilitate installation in confined spaces. The standard M30 mounting thread and adjustable bracket offer installation flexibility. Cable options up to 20 m support adaptable connections. For harsh environments, optional accessories enhance infrared camera usability. Water-cooled housings enable operation at ambient temperatures up to 250 °C, and air purge systems protect optics from dust, smoke, and fumes. Additional accessories include optical shutters and outdoor housings for exposed conditions.

Manufactured in Germany, the Optris Xi640 LT USB combines precision engineering, reliability, and cost-effectiveness. Its high resolution, real-time imaging, and integration capabilities support continuous non-contact temperature measurement. The Xi640 LT USB delivers detailed thermal data for efficient process control and enhanced product quality in automated production lines, research laboratories, and monitoring systems.

Thermography software optris PIX Connect is included and license-free.All infrared cameras are delivered with the thermography software optris PIX Connect, developed specifically for the extensive documentation and analysis of thermal images. The Windows-based PIX Connect software enables users to tailor the infrared cameras to meet specific requirements. It analyses live and recorded temperature data and triggers alarm signals for process integration.The key to leveraging the Optris infrared camera is a correct configuration. This includes detailed device-specific configurations such as frame rate, measurement range adjustments, external communication settings, and USB/Ethernet configurations. Moreover, PIX Connect facilitates firmware updates and the download of configuration files over the Internet. PIX Connect Optris offers several different SDKs for our Xi and PI thermal imaging cameras. Depending on the operating platform, the infrared camera, the coding language, and the hardware platform, different software interfaces can be utilized: SDK The Optris IRmobile 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 camera‘s field of view or adjusting the configuration. The app analyzes the connected infrared camera‘s 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 trust the temperature measurement of a single pixel?

Due to the diffraction-limited nature of infrared optics, the optical resolution and image quality are physically limited. As the dimensions of the individual pixels are in the same range as the infrared wavelength, users shall ensure that the target is larger than the camera’s MFOV.

What is the speed of the Xi640 LT USB thermal camera?

32 Hz

Can I use the Xi640 LT USB with an Ethernet connection?

The Xi640 is a USB infrared camera. For an Ethernet infrared camera, please review the Xi410 or use a W&T USB to Ethernet redirector.

Is the Xi640 LT USB export-controlled?

The Xi640’s high resolution qualifies it for export control in the EU and US markets. Check with local compliance authorities for procedures to manage exports outside the U.S. or European markets.

Can I use the Xi640 LT USB thermal camera to measure metal temperatures?

Most metal targets have low emissivity and tend to reflect heat to temperatures from any area incident upon the target. IR cameras with long-wave detectors like the Xi640 are particularly vulnerable to this low emissivity effect. For this reason, it is best to use a short-wavelength camera like the Optris Xi1M when measuring metal targets, unless it is possible to coat or paint the metal part to improve surface emissivity. Emissivity can also be improved on metal surfaces when they are rough-textured or when there are holes or crevices where measurements can be made inside the cavity.

Where is the Xi 640 LT USB thermal camera made, and does it contain memory components sourced from outside the U.S. or the European Union?

The Xi640 thermal camera is designed, manufactured, and calibrated in Berlin, Germany. Some electronic components may be sourced from outside the EU or the US. Still, it is important to note that the Xi640 does not store any thermal images or temperature values in non-volatile memory. The Xi640 only stores full thermal images, thermal video (.ravi files), and temperature values in the customer PC hosting the PIX Connect software necessary to operate the camera. The camera uses memory components inside the camera electronics, which may be sourced outside the EU or the US to store a reference picture (also called dark picture) of the non-uniformity correction paddle or flag and some reference temperatures used to correct temperature drift. All these memory elements are deleted when the power to the camera head is terminated.

Does the Xi640 LT USB thermal camera have any Wi-Fi or other communication capabilities?

The Xi640 LT USB has no electronic components that enable external communication.

Can the Xi640 LT USB thermal camera operate without a connection to a computer?

The Xi640 LT USB must be connected to a PC loaded with Optris PIX Connect software to produce thermal images and remote temperature measurements. By eliminating processing in the camera head and leveraging PC processing power, the camera head size can be reduced, and the ambient operating temperature can be increased. Autonomous operation (without the use of a PC) is supported in the Optris Xi ETH series of infrared cameras.

Can the Xi640 LT USB thermal camera send temperature information from spots or areas to my PLC?

The Xi640 can send temperature information or temperature alarms from the Process Interface connection on the back of the thermal camera. A cable with integrated electronics and a terminal block is included with the camera. It can be programmed in PIX Connect software as an Analog Input (AI) and Digital Input (DI) to control the thermal camera or as an Analog Output (AO) to control the process. The signal level is always 0-10 V (DI = 24 V). An optional industrial process interface is also available, delivering up to three independent temperature values or alarms to a user-supplied PLC. USB-RS485 adapters are available for applications with output requirements for more than three areas.

What are the associated part numbers for this product?

OPTXI64LTO22T090, OPTXI64LTO36T090, OPTXI64LTO65T090

Is your infrared camera long-wave (LWIR) or short-wave (SWIR/MWIR)? What’s the typical frame rate? What’s the IFOV (instantaneous field of view / pixel size)? And does it connect to a PC via USB, or what other platforms/interfaces are supported (e.g., Ethernet, etc.)?

Optris provides different types of IR cameras with different wavelengths. Here you can find an overview of the different camera types regarding the spectral ranges, the typical frame rates and the interface versions (USB or Ethernet (ETH)):
Long-wave (LWIR) cameras (spectral range 8-14 µm):
– PI400i LT (80Hz, switchable to 27 Hz),
– PI450i LT (80Hz, switchable to 27 Hz),
– PI640i LT (32 Hz (640×120 px @ 125 Hz),
– Xi80 LT ETH (50 Hz),
– Xi400 LT USB (80Hz, switchable to 27 Hz),
– Xi410 LT ETH (25 Hz (connected via Ethernet,4 Hz connected via USB),
– Xi640 LT USB (32 Hz)
Long-wave (LWIR) cameras (spectral range 7,9 µm):
– PI450iG7 (80Hz, switchable to 27 Hz),
– PI640iG7 (32 Hz (640×120 px @ 125 Hz)
Middle-wave (MWIR) cameras (spectral range 3,9 µm):
– Xi320MT (30 Hz)
Short-wave (SWIR) cameras:
– PI1M (0,85-1,1µm), 32 Hz (382×268 px @ 80 Hz, (switchable to 27 Hz)/ 72×56 px/ 764×8 px @1 kHz)),
– PI08M (780-820 µm), 32 Hz (382×268 px @ 80 Hz, (switchable to 27 Hz)/ 72×56 px/ 764×8 px @1 kHz)) ,
– PI05M (500-540 µm), 764×480 px @ 32 Hz/ 382×288 px @ 80 Hz (switchable to 27 Hz)/ 72×56 px/ 764×8 px @ 1 kHz,
– Xi1M ETH (0,85-1,1µm), 396×300 px, 20 Hz, 396×8 px (auton.: 396×1 px), 500 Hz, 0,85-1,1 μm, Ethernet, USB 2.0 (only 20 Hz), Auton. operation,
– Xi05M ETH (500-540 µm), 396×300 px, 20 Hz, 396×8 px (auton.: 396×1 px), 500 Hz, 500-540 nm, Ethernet, USB 2.0 (only 20 Hz), Auton. operation
The following digital interface kits are for the Xi 80/ 410/ 05M/ 08M cameras available:
– Ethernet TCP/IP / Modbus TCP interface kit
– EtherNet/IP interface kit
– Profinet kit
You can see the IFOV (instantaneous field of view / pixel size) for your IR camera with the different available optics in the optics calculator on the Optris website: Optris IR Camera Calculator (https://optris.com/optris-calculator/camera/)
Example:

What is the bit depth of our camera?

The bit depth of our cameras is 14 bit. The data has 16 bit but only 14 bit are used for the Temperature Data and the other 2 bits are not used

Can we send the raw ADU data from the camera to another commercial software for processing?

As a rule, we do not disclose any information about raw data. The only option is to use the Connect SDK to output the camera’s ADU values as a matrix. However, these ADU values are uninterpreted. The cameras can send the temperature information and the color information to another commercial software for processing.

Does changing the mode from Temperature to ADU in the Connect SDK change the way that the image is displayed?

No , the way the image is displayed does not change. You can see this in the software examples provided with the PIXConnect software (See the menu HELP => Connect SDK => Examples). Under the configuration menu => External communication => ConnectSDK you can change the mode from “Temperatures” to “ADU”. This has no influence on the displayed image.

Our company designs and supplies camera systems for steelmaking processes and is exploring different camera types. For this application, would you recommend long-range, near-infrared, or short-wave infrared models?

For steelmaking processes we recommend short-wave infrared cameras as the PI 1M camera, PI 08M camera, PI05M camera , Xi1M camera or Xi 05M camera. Use the lowest wavelength / spectral range as possible!

Which Optris infrared cameras support integration with machine learning frameworks? Do they provide raw thermal image data access via SDK/API (e.g., the OTC SDK), allowing developers to apply custom ML models for tasks like segmentation, classification, or predictive thermal analysis?

The IR cameras do not provide any raw thermal image data access. You get the temperature data via the SDK (OTC SDK) from the camera to your process.

Which Optris infrared camera is best for measuring temperatures during welding processes?

– The choose of the correct Optris infrared camera depends on the temperature range and the type of the welding process.
– For plastic welding , a PI/Xi LT camera can be used (8-14 µm)
– For metal (e.g. steel applications) a short wavelength camera PI 1M/08M/05M , Xi 1M , Xi05M should
be used (0.85-1.1 µm , 780-820 µm , 500-540 µm)
– For laser welding applications Optris provides IR cameras with a blocking filter.

• Infrared camera Xi 640
• USB cable (1 m)
• Cable for output/input (1 m)
• Mounting bracket with nut
• PIX Connect
• Quick Start Guide