K20-8-509 is a thermocouple thermopile with an integral 3-pin connector made by Watlow. It is comprised of an RTD (resistance temperature detector) sensor, thermopile element, strain relief, wire guard and J-type thermocouple junction. The thermopile acts as a thermocouple emulator, allowing users to take advantage of a variety of temperature monitoring capabilities. The device also comes with a 3-pin connector, making it convenient to attach and disconnect from various sources – ideal for applications that require frequent exchange of sensor elements.