S-type platinum rhodium thermocouple Jiangsu manufacturer brand: Jiangsu Yunyi

I. Overview

Platinum rhodium 10 platinum thermocouple (S-type thermocouple) is a precious metal thermocouple. The diameter of the thermocouple wire is specified as 0.5mm, with an allowable deviation of -0.015mm. The nominal chemical composition of its positive electrode (SP) is platinum rhodium alloy, which contains 10% rhodium and 90% platinum. The negative electrode (SN) is pure platinum, hence it is commonly known as a single platinum rhodium thermocouple. The maximum operating temperature of this thermocouple is 1300 ℃, and the short-term maximum operating temperature is 1600 ℃.

The S-type thermocouple has the advantages of high accuracy, stability, wide temperature measurement range, and long service life in the thermocouple series. It has good physical and chemical properties, stable thermoelectric potential, and excellent oxidation resistance at high temperatures, making it suitable for both oxidizing and inert atmospheres. Due to its excellent comprehensive performance and compatibility with temperature scales, the S-type thermocouple has been used as an interpolation instrument for temperature scales. Although "ITS-90" stipulates that it will no longer be used as an internal inspection instrument for temperature scales in the future, the Temperature Advisory Committee (CCT) believes that S-type thermocouples can still be used to approximate temperature scales.

The shortcomings of S-type thermocouples are thermoelectric potential, low thermoelectric potential rate, low sensitivity reading, decreased mechanical strength at high temperatures, high sensitivity to pollution, expensive precious metal materials, and therefore a large one-time investment. The S-type thermocouple, also known as the single platinum rhodium thermocouple, has an S division mark and is mainly used to measure the temperature of the medium between 0 and 1600 ℃. It is a category of precious metal thermocouples. Normal use in high-temperature environments such as coking plants and steel mills.

The S-type thermocouple has the highest measurement accuracy when the normal operating temperature is around 800~1300 ℃, but the temperature measurement accuracy within 800 ℃ is not high. However, when the operating temperature is above 1300 ℃, the thermocouple is easily damaged. Therefore, choosing the correct scale thermocouple is an important factor in ensuring temperature measurement accuracy.

2、 Main technical parameters

Electrical export: M20x1.5, NPT1/2

Accuracy level: I, II

Protection level: IP65

Wire diameter: Φ 0.5

Nominal pressure: atmospheric pressure

Product execution standards: IEC584, IEC751, JB/T5582-1991

3、 Model and specifications

Ordering instructions:

1. Indicate the thermocouple model, graduation number, and operating temperature range.

2. Thermocouple protection tube diameter, length, material, etc.

3. For those with fasteners and flange devices, the dimensions need to be provided first.