Commissioning of resistance thermometers

Tem­per­a­ture is mea­sured with RTD tem­per­a­ture probes in the food indus­try, solar and wind ener­gy, HVAC‑R and a wide vari­ety of oth­er indus­tri­al appli­ca­tions. RTDs (Resis­tance Tem­per­a­ture Detec­tors) mea­sure tem­per­a­ture-depen­dent elec­tri­cal resis­tance, which increas­es with ris­ing tem­per­a­ture. This is referred to as a pos­i­tive tem­per­a­ture coef­fi­cient (PTC). The most wide­ly used nom­i­nal val­ues are Pt100, Pt500, and Pt1000. The var­i­ous nom­i­nal val­ues, tem­per­a­ture-depen­dent out­put char­ac­ter­is­tic, and tol­er­ances are spec­i­fied in DIN EN 60751.