Platinum Specifications


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 limitMaximum limit
PT-10214 K 873 K
PT-103 14 K873 K
PT-111 14 K673 K

SoftCal™ accuracy

 73 K to 305 K305 K to 400 K400 K to 475 K475 K to 500 K500 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 accuracy2Long-term stability3
 Calibrations to 800 KAll other calibrations
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 (
20 K 2.29130.0850.74
50 K9.38650.3601.90
77 K20.3800.4231.60
150 K50.7880.4091.20
300 K 110.3540.3871.10
600 K 221.5350.3721.00
800 K 289.7890.3601.00

Click here for expanded response table

PT-100 Series interchangeability

Physical specifications

 MassLead typeInternal atmosphereMaterials used Vacuum compatibleNon-magnetic packaging
250 mg2, platinum Partially filled powderPlatinum winding partially supported by a high temperature alumina powder inside a ceramic tube, platinum lead wires NoYes
PT-103120 mg2, platinum 95%, rhodium 5% alloyFully filled powderPlatinum winding fully supported by a high temperature alumina powder inside a ceramic tube, platinum/rhodium lead wiresNoYes
PT-11152 mg2, platinumSolid glassOne platinum band wound onto a glass tube which is protected from the environment by a layer of glaze, platinum coated nickel lead wires YesNo

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)


  1. Upper temperature of AL and AM packages is limited to 800 K.
  2. 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.
  3. 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.
  4. 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 T8 T14 T19 T

4 Recommended for use when T = 30 K

PT 102 package PT 103 package PT 111 package PT AL package PT AM package