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Pt-Pd-Thermocouple

NPL Platinum / Palladium Thermocouple

These Platinum / Palladium Thermocouples (Pt/Pd) are manufactured by the National Physical Laboratory (NPL) who have developed a novel physical mechanism which mitigates the mechanical stresses caused by the different thermal expansion of Pt and Pd wires. This dispenses with the fragile coil conventionally used with this type of thermocouple.

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NPL Platinum / Palladium Thermocouple

Features

  • Superior Stability
  • Gas Tight Assembly
  • Premium Grade Wire

Description

Platinum / Palladium thermocouples are more costly than Platinum / Platinum Rhodium types but benefit from superior performance, both in terms of stability (less de-calibration) and accuracy.

Gold / Platinum Thermocouples (Au/Pt) offer the best performance but are limited to a maximum temperature of 1000°C.

These Pt/Pd thermocouples offer lower drift than Platinum / Platinum Rhodium (Pt/Pt-Rh)and with higher operating temperatures than Au/Pt. They are suitable for a range of applications including transfer standards.

In addition to developing the novel structural design along with new annealing and construction procedures NPL have established the world’s first ISO 17025 (UKAS) accredited calibration services using metal-carbon eutectic fixed point cells.

Specifications

Temperature Range0 to 1500°C
Sheath Materials Measuring Junction4mm x 710mm fits into a removable 7mm x 700mm protective outer ceramic sheath
Reference JunctionEnclosed in a Quartz sheath
Applicable StandardIEC 62460 Edition 1.0
How to orderModel type: NPL Pt/Pd Thermocouple. Includes UKAS Calibration specify range from either:
How to order0°c to 1100°C uncertainty of ±0.2°C calibrated at fixed points Zn, Ag, and Cu. 0°C to 1330°C.
How to order0°C to 1330°C. Uncertainty of ±0.2°C from 0°C to 1100°C rising linearly to ±0.55°C at 1330°C. Calibrated at Fixed Points Zn, Ag and Pd-c.
How to order0°C to 1500°C. Uncertainty of ±0.2°C from 0°C to 1100°C rising linearly to ±0.7°C at 1500°C. Calibrated at Fixed Points Zn, Ag, Pd-c.

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