How to detect the platinum and rhodium content of the thermocouple?

For S grade thermocouple platinum-rhodium alloy wire, rhodium contains 10%; for R grade thermocouple platinum-rhodium alloy wire, rhodium contains 13%; for B grade thermocouple platinum-rhodium alloy wire, positive wire contains 30% rhodium, The anode wire contains 6% rhodium. Take a cup of engine oil, try to heat it, insert a glass tube mercury thermometer (200℃), heat the oil and keep it at 200℃. Insert the end of the thermocouple under test into the oil, and set it to the DC millivolt range with a 4.5-digit digital multimeter (of course, a high-precision millivoltmeter is better). 1. The reading measured by the digital multimeter is 1.441 millivolts, which is the S index thermocouple. The platinum-rhodium alloy wire (positive electrode) touched by the red test lead contains 10% rhodium. 2. The reading measured by the digital multimeter is 1.469 millivolts, which is the R index thermocouple. The platinum-rhodium alloy wire (positive electrode) touched by the red test lead contains 13% rhodium. 3. The reading measured by the digital multimeter is 0.178 millivolt, which is the thermocouple with B index. Negative electrode), containing 6% rhodium. Of course, the oil temperature can be raised to 300℃, and S and R thermocouples can be better distinguished. 1. The reading measured by the digital multimeter is 2.323 millivolts, which is the S index thermocouple. The platinum-rhodium alloy wire touched by the red meter pen contains 10% rhodium. 2. The reading measured by the digital multimeter is 2.401 millivolts, which is the R-graded thermocouple. The platinum-rhodium alloy wire touched by the red meter pen contains 13% rhodium. 3. The reading measured by the digital multimeter is 0.431 millivolt, which is the B index thermocouple, the platinum-rhodium alloy wire (positive electrode) contacted by the red test pen, contains 30% rhodium, and the platinum-rhodium alloy wire contacted by the black test pen ( Negative electrode), containing 6% rhodium.

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