Resistance sensors with connection heads are for solid, fluid or gaseous mediums. They are used for example at pipelines, within Heater and oven constructions. The interchangeable gauge slide is a standard Pt100 class B with two-wire circuit. Three- and four wire circuits resistance sensors class A as per IEC 751 are as well available. The B-shaped connection head is for surrounding temperatures up to 100 °C. BBK-heads goes up to 120 °C. The protection tube of the PWF 330 is reduced from Ø 12 mm down to Ø 9 mm and has a G 1” welded screw-in pivot at the protection tube for fastening.