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Platinum Specifications

General

Standard curve IEC 751

Recommended excitation 1 mA

Dissipation at recommended excitation 100 µW at 273 K

Thermal response time PT-102 & PT-103: 1.75 s at 77 K, 12.5 s at 273 K; PT-111: 2.5 s at 77 K, 20 s at 273 K

Use in radiation Recommended for use in ionizing radiation environments — more information

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 — more information

Reproducibility⁴ ±5 mK at 77 K

Soldering standard J-STD-001 Class 2

¹ Short-term reproducibility data is obtained by subjecting sensor to repeated thermal shocks from 305 K to 77 K

Range of use

	Minimum limit	Maximum limit
PT-102	14 K	873 K
PT-103	14 K	873 K
PT-111	14 K	673 K

SoftCal™ accuracy

	73 K to 305 K	305 K to 400 K	400 K to 475 K	475 K to 500 K	500 K to 670 K
2S	±0.25 K	±0.9 K	±1.3 K	±1.4 K	±2.3 K
3S	±0.25 K	±0.25 K	±0.25 K	±1.4 K	±2.3 K

2S: 77 K and 305 K
3S: 77 K, 305 K and 475 K

Calibrated accuracy

	Typical sensor accuracy²		Long-term stability³
	Calibrations to 800 K	All other calibrations	Long-term stability³
30 K	±10 mK	±10 mK	—
77 K	±12 mK	±12 mK	±10 mK
305 K	±23 mK	±23 mK	—
400 K	±210 mK	±41 mK	—
500 K	±210 mK	±46 mK	—
800 K	±310 mK	—	—

² [(Calibration uncertainty)² + (reproducibility)²]^0.5 for more information see Appendices B, D, and E

³ If not heated above 475 K—long-term stability data is obtained by subjecting sensor to 200 thermal shocks from 305 K to 77 K

Temperature response data table (typical)

	R (Ω)	PT-100 S (Ω/K)	(T/R) (dR/dT)
20 K	2.2913	0.085	0.74
50 K	9.3865	0.360	1.90
77 K	20.380	0.423	1.60
150 K	50.788	0.409	1.20
300 K	110.354	0.387	1.10
600 K	221.535	0.372	1.00
800 K	289.789	0.360	1.00

Click here for expanded response table

PT-100 Series interchangeability

Physical specifications

	Mass	Lead type	Internal atmosphere	Materials used	Vacuum compatible	Non-magnetic packaging
PT-102	250 mg	2, platinum	Partially filled powder	Platinum winding partially supported by a high temperature alumina powder inside a ceramic tube, platinum lead wires	No	Yes
PT-103	120 mg	2, platinum 95%, rhodium 5% alloy	Fully filled powder	Platinum winding fully supported by a high temperature alumina powder inside a ceramic tube, platinum/rhodium lead wires	No	Yes
PT-111	52 mg	2, platinum	Solid glass	One platinum band wound onto a glass tube which is protected from the environment by a layer of glaze, platinum coated nickel lead wires	Yes	No

Platinum calibration ranges

Add -LN* for matching PT sensors to ±0.1 K at 77 K
**Must be purchased with all matching sensors, as well as with the sensor to be matched (either SoftCal or full calibration, e.g., 2S or 14L)

NOTES:

Upper temperature of AL and AM packages is limited to 800 K.
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 the purchase of only one calibration.
For larger quantities, or for different requirements, consult Lake Shore. At the time of order, add -LN to the model number.
Example: PT-102-14L-LN is a PT-102-LN RTD with a calibration range of 14 K to 325 K that is matched with at least one other uncalibrated PT-102 to within ±0.1 K at liquid nitrogen temperature.
For metrological applications below 30 K, use a germanium RTD. 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.
For use above 500 K, anneal at Tmax +10 °C for 4 h.

Typical magnetic field-dependent temperature errors⁴ Δ T/T (%) at B (magnetic induction)

Package base parallel to field B
T (K)	2.5 T	5 T	8 T	14 T	19 T
20	20	—	100	250	—
40	0.5	1.5	3	6	8.8
87	0.04	0.14	0.4	1	1.7
300	-0.01	0.001	0.02	0.07	0.13

⁴ Recommended for use when T = 30 K