Process control sensors can be used to measure temperatures in ovens, liquids, gases, and surfaces. The assemblies can be used as replacement sensors for systems that have thermowells in place or as stand alone sensors. Typical applications include environment, heaters, ovens, bearings, motors, liquids, and surfaces. The mounting methods include spring loaded, threaded, bolt on, clamp on, stick on, weld on, and insertion. The applications and mounting solutions are endless.