Standard thermocouple

Platinum rhodium thermocouple is a thermocouple with high accuracy, good physical and chemical properties, excellent oxidation resistance at high temperatures, and good stability and reproducibility of thermoelectric potential in the thermocouple series. Therefore, standard thermocouples, as standard measuring instruments, are used for temperature value transmission in the temperature range of (419.527-1500) ℃, and are also used for precise temperature measurement within this temperature range. First class standard thermocouples are used to calibrate second-class standard thermocouples; Second class standard thermocouples are used to calibrate industrial thermocouples and accurately measure temperatures within the range of 300 ℃ to 1500 ℃.

1、 Overview

Platinum rhodium thermocouple is a thermocouple with high accuracy, good physical and chemical properties, excellent oxidation resistance at high temperatures, and good stability and reproducibility of thermoelectric potential in the thermocouple series. Therefore, as a standard measuring instrument, standard thermocouples(419.527～1500)The ℃ temperature range is used for temperature value transmission; It is also used for precise temperature measurement within this temperature range.

Standard Platinum Rhodium 10Platinum thermocouple,Its positive pole(SP)Containing rhodium10%Platinum rhodium alloy, negative electrode(SN)For pure platinum.

Second class standard platinum rhodium30-Platinum and rhodium6Thermocouples are mainly used as standard devices1100-1500The ℃ temperature range is used for temperature value transmission and also for precise temperature measurement in this temperature range.

Second class standard platinum rhodium30-Pt-Rh6thermocouple(Hereinafter referred to as standard double platinum rhodium thermocouple)Its positive pole(BP)Containing rhodium30%Platinum rhodium alloy, negative electrode(BN)Containing rhodium6%Platinum rhodium alloy.

2、 The purpose of standard thermocouples:

First class standard thermocouples are used to calibrate second-class standard thermocouples; Second class standard thermocouples are used for verifying industrial thermocouples and precision measurements300℃—1500The temperature within the temperature range of ℃.

3、 Main technical parameters of standard thermocouples

modelname	accuracy class	Main technical parameters
WRPB-1 First class standard platinum rhodium10Platinum thermocouple	first-class	Use temperature zone:300-1300℃ Platinum rhodium wire diameter:0.5-0.015mm， Length not less than1000mm E(tCu)=10.575±0.015mV E(tAl)=5.860+0.37[E(tCu)-10.575]±0.005mV E(tZn)=3.447+0.18[E(tCu)-10.575]±0.005mV Stability: Copper dots（1084.62℃）≤5μV
WRPB-2 Second class standard platinum rhodium10Platinum thermocouple	second	Use temperature zone:300-1300℃ Platinum rhodium wire diameter:0.5-0.015mm， Length not less than1000mm E(tCu)=10.575±0.015mV E(tAl)=5.860+0.37[E(tCu)-10.575]±0.005mV E(tZn)=3.447+0.18[E(tCu)-10.575]±0.005mV Stability: Copper dots（1084.62℃）≤10μV
WRRB-2 Second class standard platinum rhodium30-Platinum and rhodium6Thermocouple	second	Use temperature zone:1100-1500℃ E（1100℃）=5.780soil0.025mV E（1500℃）=10.099scholar0.040mV Second class standard platinum rhodium30-Platinum and rhodium6The stability of thermocouples depends on their1500The change in thermoelectric potential at ℃ determines that the annual variation does not exceed18μV.

Cover of Standard Thermocouple User ManualSample of Product Qualification Certificate

national standard:JJG75-1995Standard Platinum Rhodium10-Verification Regulations for Platinum Thermocouples

JJG167-1995Standard Platinum Rhodium30Platinum rhodium6Thermocouple Verification Regulations

Note: Waste platinum resistance thermometers, standard thermocouple wires, and industrial waste platinum rhodium wires can be exchanged for new or recycled at a fixed price.