RTD Temperature Sensors Explore Ashcroft RTD temperature sensors for your specific application. Ashcroft RTD sensor assemblies monitor temperature in industrial, process and hazardous installations. Available with Pt 100 and Pt 1000 RTDs, they are designed for use with either DIN 43772/T.2 or ISA-ds 49 style thermowells along with DIN and ASME type lag extensions. A wide selection of aluminum and 316 stainless steel connection heads make these devices configurable to the requirements of nearly any installation.