AccuMac – AM1968 Capsule SPRT
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Description
- Rtpw Drift < 1 mK after thermal cycle
- Temperature range: -260 ?C (13K) to 100 ?C (373K)
- Short term stability < 1 mK
- Nominal Rtpw: 25 ohm at 0 ?C
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 0.003925Ω/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
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-260°C to 100°C
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Resistance at 0.01 °C
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Nominal 25 Ω
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Temperature Coefficient
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0.003925 Ω/ Ω/°C
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Drift of R(tpw)*
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< 0.003°C at TPW after 1 year, < 0.001°C typical
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Short Term Stability
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±0.001°C
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Thermal Shock
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±0.001°C after thermal cycles from minimum to maximum temperatures
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Self-heating
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0.0015 °C at 1 mA current
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Resistance Ratios
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W(Ga)>=1.11807, W(Hg)<=0.844235
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Measurement Current
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1 mA
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Sensor Length
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42 mm
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Filling Gas
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Helium
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Sheath Material
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Platinum
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Dimension
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Sheath diameter 5mm, glass head diameter 7mm, length 60mm
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External Leads
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Teflontm –4 platinum wires, 30mm
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Additional information
Brands | AccuMac |
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