Thermocouples Are Typically Constructed Either As A Wire Welded Tip Junction Inside A Tube For Temperatures Up To 900°F, Or A Mineral Insulated Wire Junction In A Highly Compacted Stainless Steel Sheath Which Offers A Wider Variety Of Diameters, And Allows For The Sensors To Be Bent In The Field For Temperatures Up To 2200ºF. Thermocouple Sensors Are Available In A Huge Range Of Physical Shapes With A Variety Of Lead Wire, Housing, And Mounting Options. Resistance Temperature Detectors (RTDs) Are Characterized By A Linear Change In Resistance With Respect To Temperature. Compared To Thermocouples The RTD Is More Accurate With Repeatable Accuracy And Stability. Applications Cover A Wide Operating Range From -328°F Up To 1200°F.