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RoxTM RTDs
1-23
RoxTM Ruthenium Oxide
* Useful to below 50 mK * Model RX-202A is monotonic to room temperature * Interchangeable to a standard curve * Good radiation resistance * Low magnetic fieldinduced errors Ruthenium oxide temperature sensors are thick-film resistors used in applications involving magnetic fields. These sensors are composite materials consisting of bismuth ruthenate, ruthenium oxides, binders, and other compounds to obtain the necessary temperature and resistance characteristics. Ruthenium oxide temperature sensors have some unique advantages over other temperature resistors. Each model of the Lake Shore RoxTM temperature sensor adheres to a single resistance versus temperature curve. The RX-102A and RX-202A are useful temperature sensors to below 50 mK.
RoxTM Model RX-102A TM (1000 at room temperatures) is useful down to 50 mK and has better interchangeability than the Model RX-202A in addition to low magnetic field-induced errors. Packaging All models are available in Lake Shore's standard copper A-can (3 mm diameter by 8.5 mm long). Two of the models are available as bare chips for applications requiring a physically smaller sensor or a faster response time. The Model RX-102A-BR is a bare chip version of the Model RX-102A. Dimensions for this bare chip version are 1.4 mm long by 1.27 mm wide by 0.25 mm thick. This bare chip features wrap-around noble metal contacts which can be soldered to using standard lead/tin solder. The Model RX-103ABR is a bare chip version of the Model RX-103A. This bare chip has wrap-around pretinned contacts which can be soldered to using standard lead/tin solder. Dimensions for the bare chip version are 1.45 mm long by 1.25 mm wide by 0.25 mm thick. The pretinned contacts increase the sensor thickness from 0.25 mm to 0.41 mm. Leads are not attached to these models, so they are not available as matched or calibrated sensors.
RoxTM Model RX-202A TM (2000 at room temperature) is a unique ruthenium oxide temperature sensor, with specific advantages over other ruthenium oxide temperature sensors. The RX-202A is a factor of four (4) improvement in magnetic fieldinduced errors over other commercially available ruthenium oxide temperature sensors with similar resistances and sensitivities. Most ruthenium oxide sensors have a maximum useful temperature limit well below room temperature where the sensitivity changes from negative to positive. The RX-202A however, is designed to have a monotonic response from 0.05 K up to 300 K. RoxTM Model RX-103A TM (10,000 at room temperature) has a unique resistance and temperature response curve. The RX-103A is the best choice for interchangeability from 1.4 K to 150 K combined with low magnetic field-induced errors.
TM TM TM RoxTM RTDs TM
Typical Resistance and Sensitivity values for RoxTM RTDs. See page A-56 for tabular data.
Lake Shore
(614) 891-2244 Fax: (614) 818-1600 www.lakeshore.com EMail: sales@lakeshore.com
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RoxTM RTDs
Specifications
Temperature Useful range Minimum Maximum Maximum storage temperature Standard curve Resistance (typical) Sensitivity (typical) Dimensionless sensitivity (typical) Accuracy (interchangeability) Matched Unmatched Accuracy (SoftCalTM) Accuracy (calibrated) Stability Short-term Long-term Thermal response time (A-can) Recommended recalibration schedule Excitation Recommended Maximum power before damage Dissipation at rated excitation Units range (volts or ohms) Lead wire configuration Physical Specifications Materials in the sensor/construction Size in millimeters Mass Leads Size Number Material Insulation Internal atmosphere RX-102A-AA 0.05 K 40 K 300 K Yes (0.05 K to 20 K) See plots on previous page See plots on previous page See plots on previous page See table See table 40 mK at 4.2 K, 300 mK at 20 K 5 mK at 0.05 K, 6 mK at 1.4 K 15 mK at 4.2 K, 110 mK at 20 K 15 mK at 4.2 K 30 mK/yr at 4.2 K 0.5 seconds at 4.2 K, 2.5 seconds at 77 K Annual 10 mV or less for T>1 K, 30 V with AC bridge, 50 mK to 1 K 10-5 W, 0.1 mA or 1 V, whichever is less 7.5 x 10-8 W at 4.2 K 1000 at 273 K to 70,000 at 0.05 K Two lead, no polarity RX-202A-AA 0.05 K 40 K 300 K Yes (0.05 K to 20 K) See plots on previous page See plots on previous page See plots on previous page See table See table 60 mK at 4.2 K, 400 mK at 20 K 5 mK at 0.05 K, 7 mK at 1.4 K, 13 mK at 4.2 K, 77 mK at 20 K 13 mK at 4.2 K 50 mK/yr at 4.2 K 0.5 seconds at 4.2 K, 2.5 seconds at 77 K Annual 10 mV or less for T>1 K, 30 V with AC bridge, 50 mK to 1 K 10-5 W, 0.1 mA or 1 V, whichever is less 7.5 x 10-8 W at 4.2 K 2000 at 300 K to 100,000 at 0.05 K Two lead, no polarity RX-103A-AA 1.2 K 40 K 300 K Yes (1.2 K to 100 K) See plots on previous page See plots on previous page See plots on previous page See table See table 30 mK at 4.2 K, 150 mK at 20 K 7 mK at 1.4 K, 11 mK at 4.2 K, 65 mK at 20 K 10 mK at 4.2 K 15 mK/yr at 4.2 K 0.5 seconds at 4.2 K, 2.5 seconds at 77 K Annual 10 mV or less (1.2 K to 175 K) 10-5 W, 0.1 mA or 1 V, whichever is less 3.2 x 10-9 W at 1.4 K, 5.5 x 10-9 W at 4.2 K, 9.6 x 10-9 W at 77 K 10,000 at 273 K to 31,000 at 1.4 K Two lead, no polarity
Thick ruthenium dioxide and bismuth ruthenate films with palladium silver contacts, indium solder, aluminum oxide substrate, sapphire header and copper canister with epoxy seal. 3 mm diameter x 8.5 mm long 3 mm diameter x 8.5 mm long 3 mm diameter x 8.5 mm long -350 milligrams -350 milligrams -350 milligrams 0.24 mm diameter x 15 cm long Two; user should branch to four wires Copper Heavy build FormvarTM Air Recommended Recommended Not applicable Not applicable 0.24 mm diameter x 15 cm long Two; user should branch to four wires Copper Heavy build FormvarTM Air Recommended Recommended Not applicable Not applicable 0.24 mm diameter x 15 cm long Two; user should branch to four wires Copper Heavy build FormvarTM Helium-4 Recommended Recommended Not applicable Not applicable
TM RoxTM RTDs
Environmental Radiation effects Magnetic fields ESD sensitivity Noise sensitivity
Magnetic Field Data for Sample RoxTM RTDs
Lake Shore
(614) 891-2244 Fax: (614) 818-1600 www.lakeshore.com EMail: sales@lakeshore.com
RoxTM RTDs
1-25
Temperature (kelvin)
0.05 K 0.3 K 0.5 K 1.4 K 4.2 K 20 K 40 K
RX-102A-AA-M Matched
5 mK 15 mK 20 mK 25 mK 75 mK 500 mK 1.5 K
RX-102A-AA Unmatched
10 mK 20 mK 25 mK 50 mK 125 mK 1.25 K 4 K
RX-202A-AA-M Matched
10 mK 20 mK 25 mK 50 mK 150 mK 1 K 2 K
RX-202A-AA Unmatched
15 mK 25 mK 30 mK 100 mK 250 mK 2.5 K 5 K
RX-103A-AA-M Matched
RX-103A-AA Unmatched
50 mK 100 mK 700 mK 1.5 K
150 mK 400 mK 2 K 4 K
Ordering Information
RoxTM RTD Calibration Range Suffix Codes Numeric figure is the low end of the calibration; alpha character corresponds to high end. B = 40 K; D = 100 K; M = Matched (Calibration of matched sensors are available - consult factory) Model number RX-202A-AA, CD RX-202A-AA-M RX-102A-AA, CD RX-102A-AA-M RX-103A-AA, CD RX-103A-AA-M Uncal 0.05B 0.3B 1.4B
Other packaging available through special order. Consult Lake Shore.
Accessories suggested for installation (see Section 3): Stycast(R) Epoxy Apiezon(R) Grease IMI-7031 Varnish Indium Solder 90% Pb, 10% Sn Solder Phosphor-Bronze Wire Manganin Wire CryoCableTM
Bare Chip Models
Laser Trim Cut
Models RX-102A-BR RX-103A-BR
A (chip length) 1.45 mm (0.057") 1.40 mm (0.070")
B (pad width) 0.30 mm (0.012") 0.21 mm (0.010")
C (chip width) 1.27 mm (0.050") 1.23 mm (0.060")
D (thickness) 0.65 mm (0.022") 0.41 mm (0.016")
B
C
D
For information on Packages for Sensor Installation, see pages 1-40 to 1-42. Adding lead length to sensors - see page 1-43.
A
TM TM TM RoxTM RTDs TM
See the Reference Section for a detailed description of Self-heating Installation Uncalibrated sensors Calibrated sensors CalCurveTM Sensor packages
Lake Shore
(614) 891-2244 Fax: (614) 818-1600 www.lakeshore.com EMail: sales@lakeshore.com

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