1-28 PT-100 Platinum RTDs PT-100 Platinum RTDs * Follows Lake Shore extended standard curve from 30 K to 70 K * High reproducibility * Low magnetic field dependence above 40 K * Low susceptibility to ionizing radiation * Conforms to DIN 43760 and IEC 751 Standards down to 70 K * Lake Shore provides individual calibrations from 14 K to as high as 800 K * 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 of use as control elements in magnetic field environments where errors approaching a degree can be tolerated. PRTs are interchangeable above 70 K. The use of controlled-purity platinum assures uniformity from device to device. PT-111 PT-103 PT-102 See the Reference Section for a detailed description of 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 below illustrates platinum sensor conformance to the DIN 43760:1980 curve. 1. If your application requires more than one platinum resistor, up to five platinum resistors can be matched with one another to within 0.1 K at liquid nitrogen temperature with only one calibration being purchased. If absolute accuracy is required, one of these matched sensors can be calibrated. For larger quantities, or for different requirements, consult Lake Shore. At the time of order, add the suffix -LN to the sensor. Example: PT-102-14D-LN is a PT-102-LN sensor with a calibration range of 14 K to 100 K that is matched with at least one other uncalibrated PT-102 to within 0.1 K at liquid nitrogen temperature. 2. For metrological applications below 30 K, use a germanium resistor (page 1-22). PT-100 sensors are not useful below 14 K for metrology and are of limited use below 30 K for temperature control due to rapid decline in sensitivity. 3. For high temperature use anneal at Tmax +10 C. Self-heating Installation Uncalibrated sensors SoftCalTM Calibrated sensors CalCurve Sensor packages Typical Magnetic Field-Dependent Temperature Errors T/T (%) at B (magnetic induction) T(K) 2.5 20 40 87 300 20 0.5 0.04 -0.01 5 B (tesla) 8 19 - 100 250 1.5 3 6 0.14 0.4 1 0.001 0.02 0.07 - 8.8 1.7 0.13 Recommended for use when T 30 K. Long axis parallel to B; orientation effects exist. B.L. Brandt, L.G. Rubin and H.H. Sample, LowTemperature Thermometry in High Magnetic Fields. VI. Industrial-grade Pt resistors above 66 K; Rh-Fe and Au-Mn resistors above 40 K, Rev. Sci. Instrum. 59, 642 (1988). Platinum RTDs Typical Resistance and Sensitivity values for PT-100s. See page A-57 for tabular data. Lake Shore 14 (614) 891-2244 Fax: (614) 818-1600 www.lakeshore.com EMail: sales@lakeshore.com PT-100 Platinum RTDs 1-29 Specifications PT-102 PT-103 PT-111 14 K 873 K 500 K DIN 43760 See plots on previous page See plots on previous page See plots on previous page 10 mK (77 K to 305 K) See figure on previous page 14 K 873 K 500 K DIN 43760 See plots on previous page See plots on previous page See plots on previous page 10 mK (77 K to 305 K) See figure on previous page 14 K 673 K 400 K DIN 43760 See plots on previous page See plots on previous page See plots on previous page 10 mK (77 K to 305 K) See figure on previous page 250 mK (70 K to 325 K) 250 mK (70 K to 480 K) 20 mK at 100 K; 35 mK at 300 K 250 mK (70 K to 325 K) 250 mK (70 K to 480 K) 20 mK at 100 K; 35 mK at 300 K 250 mK (70 K to 325 K) 250 mK (70 K to 480 K) 20 mK at 100 K; 35 mK at 300 K Thermal response time Recommended recalibration schedule 10 mK (77 K to 305 K) 10 mK at 77 K 10 mK at 30 K to 273 K 1.75 S at 77 K; 12.5 S at 273 K Annual 10 mK (77 K to 305 K) 10 mK at 77 K 10 mK (30 K to 273 K) 1.75 S at 77 K; 12.5 S at 273 K Annual 10 mK (77 K to 305 K) 10 mK at 77 K 10 mK (30 K to 273 K) 2.5 S at 77 K; 20 S at 273 K Annual Excitation Recommended Maximum power before damage Dissipation at rated excitation Units range (ohms) Lead wire configuration (polarity) 1 mA 1 mA 5 mW, 3 mA or 1 V, whichever is less (all models) 100 W at 273 K 100 W at 273 K 0 to 300 0 to 300 Platinum, no polarity Platinum, no polarity Temperature Useful range Minimum Maximum Maximum storage temperature Standard curve Resistivity (typical) Sensitivity (typical) Dimensionless sensitivity (typical) Repeatability Accuracy (interchangeability) Accuracy (SoftCal) 2-point (77, 305) 3-point (77, 305, 480) Accuracy (calibrated) Stability Short-term Long-term (per year)(1) Physical Specifications Materials in the sensor/construction 1 mA 100 W at 273 K 0 to 300 Platinum, no polarity High stability of the PT-100 PRTs is achieved through production techniques that provide nearly strain-free, securely mounted elements rigidly encapsulated in ceramic or glass. All devices are carefully annealed after assembly (all models). 2 mm diameter x 20.3 mm long 1.6 mm diameter x 12 mm long 1.8 mm diameter x 5 mm long 250 milligrams 120 milligrams 52 milligrams Size in millimeters Mass Leads Size Number Material Insulation Internal atmosphere 0.25 mm diameter x 15 mm long Two (2) Platinum None Solid Environmental Radiation effects Magnetic fields 0.25 mm diameter x 15 mm long Two (2) Platinum None Solid 0.25 mm x diameter 10 mm long Two (2) Platinum/Nickel Alloy None Solid Recommended for use in radiation environments (all models). See Reference Section. 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 (all models). Not applicable Not applicable Not applicable None None None None None None Vacuum vs. liquid differences ESD sensitivity Noise sensitivity (1) If not heated above 475 K (2) The leads are moderately robust, but care should be taken when handling. What is SoftCal? For detailed information on SoftCal, CalCurve and Curve 10, see the Reference Section. Lake Shore For information on Packages for Sensor Installation, see pages 1-40 to 1-42. Adding lead length to sensors - see page 1-43. (614) 891-2244 Fax: (614) 818-1600 www.lakeshore.com EMail: sales@lakeshore.com Platinum RTDs SoftCal is a 2-point or 3-point calibration which offers improved accuracy without the cost of a full calibration. SoftCal is available for silicon diodes and platinum sensors. Using a 2-point SoftCal with fixed temperature points taken at 77 K and 305 K, Lake Shore can generate a temperature table for a platinum sensor which is accurate to 250 mK from 70 K to 325 K. Using a 3-point SoftCal with fixed temperature points taken at 77 K, 305 K, and 480 K, Lake Shore can generate a temperature table for a platinum sensor which is accurate to 250 mK from 70 K to 480 K. 1-30 PT-100 Platinum RTDs Ordering Information Uncalibrated sensor Specify the Model number in the left column only, for example PT-103. Calibrated sensor Add Calibration Range Suffix Code to the end of the Model number, for example PT-103-14L. Accessories suggested for installation (see Section 3) Stycast Epoxy CryoCable Apiezon Grease Manganin Wire IMI-7031 Varnish Indium Solder 90% Pb, 10% Sn Solder Phosphor-Bronze Wire Platinum RTD Model number PT-102 PT-103 PT-111 Calibration Range Suffix Codes Numeric figure is the low end of the calibration. Letters represent the high end: D = 100 K, L = 325 K, H = 475 K, J = 800 K. SoftCalTM 2S 3S 14D 14L 14H 14J 70L 70H 70J Platinum RTDs Accessories available for sensors ECRIT Expanded interpolation table SCR Special calibration report 8000 Calibration report on floppy disk COC-SEN Certificate of conformance Lake Shore (614) 891-2244 Fax: (614) 818-1600 www.lakeshore.com EMail: sales@lakeshore.com