Thermocouple Wire a Ni-Cr alloy (Chromel) as the positive thermoelement. This thermocouple is more widely used because of its relatively high thermoelectric sensitivity among the three standard thermocouple types typically choice for temperatures down Thermocouple Wire Thermocouples are used in a variety of cryogenic applications, but special techniques must be employed to approach temperature accuracies of 1% of temperature, even without consideration for the effects of high magnetic fields or high radiation fluxes. The problems are further complicated by exposure to variable gradient conditions Many Lake Shore temperature controllers offer inputs that accommodate most common types of cryogenic Heat conduction down the thermocouple wire is the same as with lead wire going to any other sensing device. Refer to Appendix C: Conduction (Lead Attachment) for more detailed information. curve data. Typical Magnetic Field-Dependent (magnetic induction) ' Data taken with entire thermocouple in field, cold junction at 4.2 K, errors in hot junction temperature ' Useful when T> 10 K. Refer to comments for ' Upper limit dependent on wire size; to achieve higher than 473 K, insulation must be removed Ordering Information Thermocouple Wire 36 AWG = 0.005 in (0.127 mm) diameter wire, excluding insulation 30 AWG = 0.010 in (0.254 mm) diameter wire, excluding insulation All thermocouple wire is Teflon® insulated - 76.2 /urn wall Model number Type Wire gauge * Minimum order 1.5 m (5 ft) length ** Minimum order 3 m (10 ft) length Lake Shore Cryotronics, Inc. e-mail: [email protected]