BB 660/25.5 is the Standard Platinum Resistance Thermometer jointly developed with National Institute of Advanced Industrial Science and Technology (AIST/NMIJ) as an interpolation device for measurements from -190℃ to approximately +660℃. Employing a sensing element with a single helix coil structure (Japan Pat. No.3380523) provides superior stability at high temperature and high resistance to vibration. It can also provide smaller self-heating temperature rise and high response.
|Single helix coil wound in a quarts sensing frame at noninductive winding (L ≦ 40mm)
|Platinum (4-wires connection)
|φ7mm x approx.570mm length
|φ19mm x approx.100mm, Aluminum outer casing
|4 Teflon insulated copper wires jacketed with cross-linked polyethylene x 2.5m
|from -189.3442℃(Ar TP) to +660.323℃(Al FP)
|approx. 25.5Ω R0