AM1968 Capsule SPRT

Shortly:

• Rtpw Drift < 1 mK after thermal cycle
• Temperature range: -260 °C (13K) to 232 °C (505K)
• Short term stability < 1 mK
• Nominal Rtpw: 25 ohm at 0 °C

AM1968 Platinum Capsule SPRT covers temperatures from -260°C to 232 °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 0.003925Ω/Ω/°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.

Features:

• Temperature range: -260 °C to 232 °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 Ω/Ω/°C
• W(Ga)>=1.11807
• W(Hg)<=0.844235
• Platinum sheath