The Siemens FK-T1K1 is a duct temperature sensor designed to provide reliable measurements within the range of 20 to 80 degrees Celsius. Featuring a 120 mm sensor probe and a response time constant of 30 seconds, this sensor is well-suited for monitoring air temperature in ventilation and HVAC systems. With an IP42 rating, it offers protection against solid objects and light splashing water, making it durable for typical duct environments. This sensor is available through BSP Automation, ensuring you have access to quality components for your automation needs.