AM1968 Platinum Capsule SPRT covers temperatures from -260°C to 100 °C. The capsule construction makes this SPRT a preferred primary standard for cryogenic applications and other applications where space is limited or stem conduction is a concern for a long stem SPRT.
The sensing element is made of pure platinum wires with a temperature coefficient of 0.003925O/O/°C.
The coiled platinum wires are mounted in a way that is strain free and enclosed in a platinum capsule, which is sealed by glass. The special sealing glass has a thermal expansion coefficient that matches with that of the platinum wire to ensure the capsule SPRT is sealed permanently in the entire temperature range. A uniquely designed support structure provides excellent performances of stability, mechanical shock, and thermal cycle performance. The SPRT achieves a high level of stability and repeatability in performance and fully meets ITS-90 criteria for reference thermometers.
· Temperature range: -260 °C to 100 °C
· Long term drift: <0.003°C at TPW after 1 year, <0.001°C typical
· Short term stability: 0.001°C at 0.01°C
· Temperature Coefficient 0.003925 O/O/°C
· W(Ga)>=1.11807
· W(Hg)<=0.844235
· Platinum sheath
