Platinum sensor specifications

Calibrated platinum sensors deliver the highest accuracy across a broad temperature range. For applications at or above 70 K where ultra-high precision is not essential, SoftCal offers a practical alternative. This method uses a simplified calibration curve derived from either two (2-point SoftCal) or three (3-point SoftCal) temperature points. Each sensor calibrated with SoftCal has a unique temperature vs. resistance curve.

For applications requiring sensor interchangeability—where multiple sensors conform to a common temperature vs. resistance curve—two options are available: standard and matched. Standard interchangeable platinum are uncalibrated and conform to the default accuracy for 100 Ω Class B platinum sensors (refer to Figure 3). For improved accuracy at 77 K, matched platinum sensors are offered in sets of up to 50 sensors. Each set is aligned to a single, calibrated reference sensor—purchased with the batch—and all sensors in the group are individually verified to match the reference within ±0.1 K at 77 K, ensuring tight conformity across the set.

Typical sensitivity Ω/K

Figure 1 Typical sensitivity over temperature for platinum

Typical resistance Ω

Figure 2 Typical resistance curve of a platinum sensor

Interchangeable standard platinum

Figure 3 100 Ω accuracy for class B platinum sensors

Performance specifications

¹Short-term reproducibility data is obtained by subjecting sensor to repeated thermal shocks from 305 K to 77 K
²If not heated above 475 K—long-term stability data is obtained by subjecting sensor to 200 thermal shocks from 305 K to 77 K

Physical specifications

Typical magnetic field-dependent temperature errors³ ΔT/T (%) at B (magnetic field)

³Recommended for use when T ≥ 30 K

PT-103

PT-103-AM

PT-111

Calibrated platinum

PT-103-2S		2-point SoftCal
PT-103-3S		3-point SoftCal
PT-103-14L		Calibrated 14 K to 325 K
PT-103-14H		Calibrated 14 K to 500 K
PT-103-14J		Calibrated 14 K to 800 K
PT-103-AM-2S		2-point SoftCal
PT-103-AM-3S		3-point SoftCal
PT-103-AM-14L		Calibrated 14 K to 325 K
PT-103-AM-14H		Calibrated 14 K to 500 K
PT-103-AM-14J		Calibrated 14 K to 800 K
PT-111-2S		2-point SoftCal
PT-111-3S		3-point SoftCal
PT-111-14L		Calibrated 14 K to 325 K
PT-111-14H		Calibrated 14 K to 500 K

Lead extensions

Platinum sensors come standard with approximately 25 mm (1 in) lead wires. Extensions can be added to your device to extend lead length, with a variety of wire types available to suit your application. Below are the most common configurations. Refer to the Lead Extensions datasheet for the complete list.

Temperature controllers

Platinum sensors can be used with both the 336 and the 335 cryogenic temperature controllers.