AM1968 Capsule SPRT

AM1968 Capsule SPRT



  • 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.


  • 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

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Amtest-TM Kft. (HU) - Attila Polgar Amtest PL (PL) - Dariusz Koziello Amtest-TM ELTH srl (RO) - Bogdan Valcea ADELANTEST Ltd (RUS) - Igor Kozlov GIGA Electronic Ltd. - Danail Georgiev OÜ Est-Doma (EST) Promix Ltd. (UA) - Oleksandr Labuzov Vildoma (LT, LV)

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