CTi Series

What makes the CTi series the right choice for automation and control applications?

• Industrial leading compact pyrometer with modular two-piece architecture
• Competitive price point without compromising the excellent measurement accuracy
• Wide range of spectral response options to optimize for any application
• Extreme ambient temperature resilience up to 250 °C
• ATEX version
• Proven Reliability – Built for harsh industrial environments
• Built-in USB interface for commissioning via PC or smartphone
• Multiple analog and alarm outputs: 0/4–20 mA, 0–5 V, 0–10 V, thermocouple type K
• Extensive digital communication protocols: EtherNet/IP, Profinet, IO-Link, EtherCAT, Ethernet TCP/Modbus TCP, Modbus RTU, RS485, RS232
• Made in Germany

The optris CTi is a modular, high-performance infrared pyrometer platform designed for precise non-contact temperature measurement in tough industrial environments. Built for flexibility and strength, the CTi series combines reliable infrared sensing technology with modern communication options and a wide range of spectral options to tackle almost any temperature measurement challenge.

At the heart of the CTi design is its two-piece structure: a compact stainless-steel sensing head (IP65 / NEMA 4) and a separate electronic box made of die-cast zinc. This setup allows for quick head exchange, easy maintenance, and maximum installation flexibility without losing calibration accuracy. Each sensing head has a unique Head ID with stored calibration data, ensuring reliable and traceable measurement performance.

The CTi platform covers a wide variety of applications through its different model variants. It includes long-wave 8–14 µm models for non-metallic surfaces (LT and LThot), ultra-fast LTfast models for dynamic processes, 5.0 µm sensors for glass (G5), and specific wavelengths for thin plastic films (P3 at 3.43 µm and P7 at 7.9 µm). The CTi series is optimized for the emissivity behavior of different materials. It also offers short-wave xM versions (1M, 2M, 3M, 4M) for hot and fast metal processes, delivering microsecond response times and temperature ranges up to 2200 °C. This range makes accurate measurements possible even in tough emissivity and ambient conditions.

Built for industrial reliability, some CTi LThot models work at ambient temperatures up to 250 °C at the sensing head, making them suitable for furnaces, kilns, and high-temperature machinery. Optical resolutions of up to 75:1 allow for precise measurement of small targets from greater distances. Optional close-focus lenses enable spot sizes in the millimeter range for detailed inspection tasks.

Integration into automation systems is easy. The CTi supports adjustable analog outputs (0/4–20 mA, 0–5 V, 0–10 V, thermocouple type K), alarm outputs, and a wide range of digital interfaces, including USB, RS232, RS485, Modbus RTU/TCP, Ethernet TCP, Profinet, EtherNet/IP, EtherCAT, and IO-Link. Optional relay modules and programmable I/O pins offer more flexibility for alarm management and process control.

Pyrometer settings can be adjusted via on-device keys or software. This allows for stable readings in changing processes. Otherwise, setup and commissioning can be done via USB using the CompactPlus Connect software or the IRmobile app, making parameterization and servicing easier.

With its modular design, extensive spectral options, durable mechanics, and wide array of interfaces, the optris CTi is more than just a standard infrared pyrometer. It is a scalable temperature measurement platform designed to integrate seamlessly into modern industrial automation while delivering reliable, traceable, and application-specific performance.