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Features and Application Notes
NICROSIL is used as positive leg of the thermocouple N. For extension leads, NICROSIL is used for type NX.
The standardized temperature range of the different application possibilities of NICROSIL is available in the tables on pages 10 and 11 as well as 14 and 15 in our brochure.
Form of Delivery
NICROSIL (NP and NPX) is supplied in the form of bare wire with dimensions from 0.10 to 6 mm Ø, coated wires from 0.10 to 1.5 mm Ø. NICROSIL is also available in the form of stranded wire, ribbon, flat wire and rods. Please contact us for the range of dimensions.
Notes on Treatment
NICROSIL can be brazed without difficulty. All known welding methods are applicable. However, the alloy is difficult to soft-solder. The thermoelectric voltage of NICROSIL may change as a result of mechanical or thermal stress, see also “Special Remarks on the Alloy”.
Special Remarks on the Alloy
NICROSIL has been developed to eliminate known disadvantages with reference to the positive leg of thermocouple type K (ISATHERM® PLUS, Chromel®-P or NiCr10). An increase in the chromium concentration to approx. 14.6 % versus KP will essentially reduce the change in EMF due to the ordering state in the metal lattice.
Thermoelectrically, the alloy therefore is considerably more stable against temperature changes below 600 °C.
NICROSIL reacts corrosively at higher temperatures in the presence of varying oxidizing/ reducing gases. Partial oxidation of the chromium will cause green rot. Sulphur and carbon favor the development of the green rot. As a consequence, the thermoelectric voltage may change dramatically. This oxidation will also lead to brittleness of the material. An increase in silicon concentration will result in higher oxidation stability versus the positive leg of thermocouple type K.