AM1968 Capsule SPRT
Product Description
AM1968 Capsule SPRT
- Rtpw Drift: < 1 mK after thermal cycle
- Temperature range: -260 °C (13K) to 100 °C (373K)
- Short term stability: <0.001 °C at 0.01 °C
- 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 0.003925 Ω/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 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 Ω/Ω/°C
- W(Ga) >= 1.11807
- W(Hg) <= 0.844235
- Platinum sheath
Specifications
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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 at 0.01 °C*
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< 0.003 °C 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 7.5mm, length 60mm
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External Leads
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4 platinum wires, 30mm
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*Long-term drift rate is for reference only. It could be affected by such facts as handling, application, and maintenance, etc.
Optional Accessories
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Model
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Description
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9007
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Carrying Case included
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Knowledge and Information
