The Optris CT 3M infrared temperature sensor is designed for low-temperature measurement of metals, metal processing, metal oxides, and ceramic materials. It measures temperatures from 122 to 3272°F (50 to 1800°C) and functions in ambient temperatures up to 185°F (85°C) without additional cooling. The short wavelength of 2.3μm reduces the margin of error when measuring materials with unknown emissivity .

Selectable analog outputs and multiple digital interfaces offer high variability. Field selectable analog output options include 0/4-20mA, 0-5V, 0-10V, Type K or J thermocouples, and alarm. The sensor includes a programmable functional input for setting external emissivity, ambient temperature compensation, and reset of hold functions. It also features peak hold, valley hold, average, and an extended hold function with threshold and hysteresis .

Optical resolution options include 22:1 (3ML), 33:1 (3MH), and 75:1 (3MH1-3MH3) for targeting small objects at various distances. The response time is 1ms, suitable for fast-moving targets. Emissivity is adjustable from 0.1 to 1.1 .

Optional plug-in interfaces include USB, RS485, RS232, 2 optically isolated relay outputs, CAN-Bus, Profibus DP, and Ethernet. The Optris Compact Connect temperature analysis software is available as a free download for data documentation and analysis. The sensor operates on 8-36VDC power supply with 100mA max current draw and is IP65 NEMA-4 rated .