I would like to ask everyone: what thickness is appropriate for the platinum-rhodium wire used in S-type thermocouples?
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I would like to ask the experts here: Recently I received a shipment of S-type thermocouples, model WRPK-531, suitable for use in solid alkali furnaces and operating in temperatures ranging from 0 to 1600°C. I noticed that the thickness of the platinum-rhodium wire varied within this shipment, and the prices quoted by different suppliers were also different. I’m wondering if there is any standard regarding the thickness of platinum-rhodium wires, and what is the minimum thickness required for practical use. I’m a newcomer to this field, so I appreciate any guidance you can provide.
The thickness of thermocouples with the same division number is specified during production; when using them, it is necessary to choose based on the actual conditions of the user, such as the insertion depth and the size of the interfaces provided by the equipment or pipes. Generally speaking, for temperatures above 400 degrees, thermocouples are not considered; using thermal resistors provides higher accuracy.
It seems like the answer upstairs isn’t relevant to the question. Brother, I’m just meddling here because of swine fever. . Let’s think about it for a moment. In theory, the thickness of the wire in a thermocouple does not affect the magnitude of the thermoelectric potential generated. But if the wire is thin, it’s more prone to breaking and is less resistant to heat, so its lifespan will naturally be shorter. If someone were to make even silk as thick as a bracelet, I guess it would take 500 years of burning to burn it through. . . . . .
Friendly reminder: I’m not the one who makes thermocouples, nor am I the one who sells them; I’ve also never studied thermocouples. If I happen to be wrong, it’s up to you whether you believe me or not. Good luck getting scammed! . .
Suppliers can be asked to provide relevant standard specifications; at the very least, companies should have their own established standards. From this, you can find the answer you need.
The textbook states that the diameter should not exceed 0.5 mm; there are no specifications or requirements regarding the minimum diameter. However, S-type thermocouples are the most expensive among them, so manufacturers certainly try to make them as thin as possible in order to save costs. This does not affect the measurement accuracy, as long as the material of the protective sleeve is suitable.
This is a armored platinum-rhodium thermocouple. Identification completed. If you have any questions, you can @ me.
My question is very simple: for this model, does the use of platinum-rhodium wire with a thickness of 0.3 to 0.5 have a significant impact on the product?
Of course, the thicker, the better. But this one might be platinum-based, with a very high content of platinum, which makes its cost too high
S-type thermocouples, made of platinum-rhodium alloy – just think about it: the recycling price for these thermocouple wires is 220 yuan per gram, one gram at that! ! ! Reputable manufacturers use 0.5mm diameter core wires, but smaller factories use wires with a diameter of 0.2mm, at most 0.3mm. Therefore, you must specify in the technical agreement that the core wire diameter must be no less than 0.5mm! ! ! ! ! !
The national standard is 0.5, with an allowable error of 0.015; therefore, many manufacturers supply wire with a diameter of 0.485. If the diameter is too small, it’s definitely because you’ve encountered unscrupulous suppliers. Identification completed.