Standard platinum-10% rhodium/platinum thermocouple PR1231/PR1232


PR1231/PR1232 10% Platinum-Iridium Standard Thermocouple Part 1 Overview: 10% platinum-iridium standard thermocouples made from first- and second-grade platinum-iridium alloys, featuring high accuracy and good physical characteristics.

10% platinum-iridium standard thermocouples feature high accuracy, good physical and chemical properties, good resistance to high-temperature oxidation, good stability, and reproducible thermoelectromotive force. Therefore, they are used as standard measuring instruments across the temperature range (419.527~1084.62°C), as well as for transmitting temperature quantities and accurately measuring temperatures across the entire range.

Parameter Index

First grade platinum-iridium 10-platinum thermocouples

Second grade platinum-iridium 10-platinum thermocouples

Positive and negative

The positive is platinum-rhodium alloy (platinum 90% rhodium 10%), the negative is pure platinum

Electrode

The diameter of the two electrodes is 0.5-0.015 mm and the length is not less than 1000 mm

Requirements for thermal electromotive force

The measured junction temperature is at Cu point (1084.62℃))Al point (660.323℃)

Zn point (419.527℃) and reference junction temperature 0℃

E(tCu ) =10.575±0.015mV      

    E(t Al )=5.860+0.37 [E(t Cu )-10.575]±0.005 mV

E(t Zn )=3.447+0.18 [E(t Cu )-10.575]±0.005 mV

Stability of thermoelectric electromotive force

3μV

5μV

Annual change of thermoelectric electromotive force at Cu point (1084.62℃))

≦5μV

≦10μV

Working temperature range

300~1100℃

Insulating sheath

Double hole porcelain tube or corundum tube

Outer diameter (3~4) mm, hole diameter (0.8~1.0) mm, length (500~550) mm

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