⎝⎛星力捕鱼⎞⎠

⎝⎛星力捕鱼⎞⎠ page Company Profile ⎝⎛星力捕鱼⎞⎠ Product center Quality system marketing network After sales service Recruitment contact us
Flow meter series
Temperature instrument series
Pressure instrument series
Calibration instrument series
Level instrument series
Digital display instrument series
Transmitter instrument series
Wire and cable series
Bridge instrument cabinet series
Pipe fitting valve series

Address: Xiongyi, Jinhe Road, Jinhu County, Jiangsu Province
Lunan
Phone: 0517-86900901
0517-86900921
0517-86900920
Fax: 0517-86900902
Postcode: 211600
http://zzyfwh.com
Email: chinadongxiang@163.com
technical article
Knowledge about thermocouple platinum rhodium wire
2011-10-25 8:49:20

热电偶 ( 也可以称之为 S型热电偶) 铂铑13-铂 热电偶 ( 也可以称之为 R型热电偶) 铂铑30-铂铑6 热电偶 (B型热电偶) 都属于 贵金属热电偶 Platinum-rhodium 10-platinum thermocouple ( also known as S-type thermocouple) , platinum-rhodium 13-platinum thermocouple ( also known as R-type thermocouple) , platinum-rhodium 30-platinum-rhodium 6 thermocouple (type B Thermocouples) are all precious metal thermocouples .

热电偶 First, S type thermocouple

偶丝直径 一般 规定为0.5 mm ,允许偏差-0.015mm, 它的 正极化学成分为铂铑合金,其中含铑为10%,含铂为90%, 负极为纯铂, 因此 之为 单铂铑热电偶。 The diameter of the S-type thermocouple wire is generally specified as 0.5 mm with an allowable deviation of -0.015 mm . Its positive electrode chemical composition is platinum-rhodium alloy, which contains 10% rhodium and 90% platinum, and the negative electrode is pure platinum. Called a single platinum rhodium thermocouple. 热电偶长期最高使用温度 一般 为1300℃,短期最高使用温度 可以达到 1600℃。 The maximum long-term use temperature of S-type thermocouple is 1300 ℃, and the short-term maximum use temperature can reach 1600 ℃.
     各类 热电偶系列中S型热电偶具有 以下优点: 准确度最高 ②稳定性最好 ③测温温区宽 ④使用寿命长等。 Among all types of thermocouple series, S-type thermocouples have the following advantages: ① the highest accuracy ; ② the best stability ; ③ wide temperature measurement temperature range ; ④ long service life. S型 热电势稳定性 及在高温下抗氧化性能 比较 好, 因此 适用于氧化性和惰性气氛中。 Because the S-type thermoelectric potential is stable and has good oxidation resistance at high temperatures , it is suitable for oxidizing and inert atmospheres. S型热电偶具有优良的综合性能,符合国际使用温标的S型热电偶,长期以来曾作为国际温标的内插仪器 At the same time, the S-type thermocouple has excellent comprehensive performance and meets the international temperature scale. The S-type thermocouple has long been used as an interpolated instrument of the international temperature scale .

    R型 热电偶 Second, R-type thermocouple
偶丝直径规定为0.5mm,允许偏差-0.015mm, 它的 正极化学成分为铂铑合金,其中含铑为13%,含铂为87%, 负极为纯铂,长期最高使用温度 一般 为1300℃,短期最高使用温度 可以达到 1600℃。 The diameter of the R-type thermocouple wire is specified as 0.5mm, and the allowable deviation is -0.015mm. Its positive electrode chemical composition is platinum-rhodium alloy, which contains 13% rhodium and 87% platinum, and the negative electrode is pure platinum, which has the highest long-term The use temperature is generally 1300 ° C, and the short-term maximum use temperature can reach 1600 ° C.
   
各类 热电偶系列中R型热电偶具有 以下优点: 准确度最高 ②稳定性最好 ③测温温区宽 ④使用寿命长等。 Among the various thermocouple series, the R-type thermocouple has the following advantages: ① the highest accuracy ; ② the best stability ; ③ wide temperature measurement temperature range ; ④ long service life. 热电势稳定性及在高温下抗氧化性能好, 因此也 适用于氧化性和惰性气氛中。 Due to its good thermoelectric potential stability and good oxidation resistance at high temperatures, it is also suitable for oxidizing and inert atmospheres. R型热电偶的综合性能与S型热电偶 差不多 在我国一直 难以 推广,除 在进口设备上的测温有所应用外,国内测温 则是 很少采用。 Although the comprehensive performance of the R-type thermocouple is similar to that of the S-type thermocouple , it has been difficult to promote in China . Except for the application of temperature measurement on imported equipment, domestic temperature measurement is rarely used. 国外一些 研究机构进行了一项合作研究结果表明,R型热电偶的稳定性和复现性比S型热电偶 From 1967 to 1971, some foreign research institutes carried out a cooperative research and found that the stability and reproducibility of R-type thermocouples are better than S-type thermocouples .     

热电偶 Three, type B thermocouple

偶丝直径规定为0.5mm,允许偏差-0.015mm, 它的 正极化学成分为铂铑合金,其中含铑为30%,含铂为70%, 负极为铂铑合金, 其中 含铑为量6%, 因此 双铂铑热电偶。 The diameter of the type B thermocouple wire is specified as 0.5mm, and the allowable deviation is -0.015mm. Its positive electrode chemical composition is platinum-rhodium alloy, which contains 30% rhodium and 70% platinum, and the negative electrode is platinum-rhodium alloy, where The amount of rhodium is 6%, so it is called double platinum rhodium thermocouple. 热电偶长期最高使用温度 一般 为1600℃,短期最高使用温度 可以达到 1800℃。 The long-term maximum use temperature of this thermocouple is generally 1600 ℃, and the short-term maximum use temperature can reach 1800 ℃.
    以下优点: 准确度最高 稳定性最好 测温温区宽 使用寿命长 ⑤测温上限高等。 In the thermocouple series, the B-type thermocouple has the following advantages: ① the highest accuracy ; ② the best stability ; wide temperature measurement temperature range ; long service life ; ⑤ high temperature measurement upper limit. 适用于氧化性和惰性气氛中,也可短期用于真空中,但 不适用于还原性气氛或 含有金属 非金属蒸气气氛中。 Type B thermocouples can be used in oxidizing and inert atmospheres, and can also be used in vacuum for a short time, but they are not suitable for reducing atmospheres or in atmospheres containing metal and non-metal vapors. 用补偿导线进行补偿,因为 在0~50℃范围内热电势小于3μV。 An obvious advantage of the B-type thermocouple is that it does not need to be compensated with a compensation wire, because its thermoelectric potential is less than 3μV in the range of 0 ~ 50 ° C.
之处 都在于 是热电势 热电势率较小 灵敏读低 高温下机械强度下降 ④对污染非常敏感 The shortcomings of the three types of thermocouples are the thermoelectric potential : ① the rate of thermoelectric potential is small ; ② the sensitivity is low ; the mechanical strength decreases at high temperature ; ④ it is very sensitive to pollution . 贵金属材料昂贵, 所以 一次性投资 较大。 All are precious metal materials, so the one-time investment is relatively large.