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.
Sensing Element | Single helix coil wound in a quarts sensing frame at noninductive winding (L ≦ 40mm) |
Sensing Element | Platinum (4-wires connection) |
Quartz Sheath | φ7mm x approx.570mm length |
Sensing Handle | φ19mm x approx.100mm, Aluminum outer casing |
Lead Wires | 4 Teflon insulated copper wires jacketed with cross-linked polyethylene x 2.5m |
Temperature Range | from -189.3442℃(Ar TP) to +660.323℃(Al FP) |
Resistance Value | approx. 25.5Ω R0 |
Resistance Ratio | WGA (29.7646℃)≧1.11807 |
Reproducibility | within 1mK |