Platinum Sensors
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58 Platinum RTDs Sensors PT-100 Series Platinum RTDs Features Temperature range: 14 K to 873 K (model dependant) Conforms to IEC 751 standards down to 70 K High reproducibility: ±5 mK at 77 K Low magnetic field dependence above 40 K Excellent for use in ionizing radiation SoftCal™ calibration available PT-100 platinum resistance thermometers (PRTs) are an excellent choice for use as cryogenic temperature sensing and control elements in the range from 30 K to 873 K (-243 °C to 600 °C). Over this temperature span, PRTs offer high repeatability and nearly constant sensitivity (dR/dT). Platinum resistors are also useful as control elements in magnetic field environments where errors approaching one degree can be tolerated. PRTs are interchangeable above 70 K. The use of controlled-purity platinum assures uniformity from one device to another. PRTs experience rapidly decreasing sensitivity below approximately 30 K. They should be calibrated in order to achieve maximum accuracy for use below 100 K. The plot illustrates platinum sensor conformance to the IEC 751 curve. PT-102 PT-103 PT-111 Matching If your application requires more than one platinum resistor, up to five platinum resistors can be matched to one another to within ±0.1 K at liquid nitrogen temperature with the purchase of only one calibration. AL, AM Typical Platinum Resistance Values www.lakeshore.com Typical Platinum Sensitivity Values Lake Shore Cryotronics, Inc. (614) 891-2244 Typical Platinum Dimensionless Sensitivity Values fax: (614) 818-1600 e-mail: info@lakeshore.com

Platinum RTDs Dissipation at recommended excitation Thermal response time Use in radiation Recommended for use in ionizing radiation environments—see Appendix B Use in magnetic field Because of their relatively low magnetic field dependence above 30 K, platinum sensors are useful as control elements in magnetic field applications when some error can be tolerated— ' Short-term reproducibility data is obtained by subjecting sensor to repeated thermal shocks SoftCal™ Accuracy Calibrated Accuracy for more information see Appendices B, D, and E * If not heated above 475 K—long-term stability...

Platinum RTDs To add length to sensor leads General tolerance of ±0.010 in (±0.254 mm) unless otherwise noted General tolerance of ±0.010 in (±0.254 mm) unless otherwise noted Uncalibratea sensor—Specify the model number in the left column only, for example PT-103. Calibrated sensor—Add the calibration range suffix code to the end of the model number, Platinum RTD Calibration Range Suffix Codes Numeric figure is the low end of the calibration Letters represent the high end: L=325 K, H = 500 K, J = 800 K *MUST be purchased with all matching sensors, as well as with the sensor to be matched...