Hermocouples used for High Temperature applications are Pt/Pt Rh type . Pt/Pt Rh 13%, 10%, or 30% can be used depending upon the operating temperatures. German make Recrystallised High Alumina Pythogorous KER - 610, KER - 710, SS 310 or Inconel 600/800 grade tubes are provided as protection sheaths. High Alumina tubes can withstand temperatures upto 1850 Deg C.
Heavy duty K (Cr/Al)Type Thermocouples are used with outer SS310, Inconel 600 , Incolley 800 or Ceramic KER-610 tubes as protection sheaths. This sheathings posses good resistance to oxidation at higher temperature. Simplex or Duplex with straight or L type are available. Mineral Insulated Thermocouples with outer SS 316 or Inconel 600 grade sheath (Simplex and Duplex) in diameters 1.0mm , 1.5mm , 3.00mm , 4.5mm , 6.00mm , 8.00mm are also offered. Thermocouples with Single or Multibore Insulators and junction block are used in laboratory applications for air temperatures. Handheld Thermocouples connected to Portable indicators can be offered for sensing the temperatures of metal surfaces.
Thermocouples and RTDs are used as per the requirements. Different sheath materials are used depending on the application.
| Type | Limits of Error | Temperature Range |
| J (Fe - K) | +/- 2.2 Deg C or +/-0.75% | Upto 750 Deg C |
| K (Cr - Al) | +/- 2.2 Deg C or +/-0.75% | Upto 1250 Deg C |
| T (Cu - K) | +/- 1.0 Deg C or +/-0.75% | Upto 350 Deg C |
| R/S/B (Pt/Pt Rh) | +/- 2.2 Deg C or +/-0.75% | Upto 1850 Deg C |
| Pt-100 | +/- 1.0 Deg C or +/-0.75% | -200 to +600 Deg C |
