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technical article
Knowledge about B-type thermocouples
2011-10-10 15:00:12

     热电偶 也可以称之为 铂铑 30- 铂铑 6 热电偶 ,它属于 贵金属热电偶。 Type B thermocouple can also be called platinum rhodium 30- platinum rhodium 6 thermocouple , which belongs to precious metal thermocouple. 偶丝直径规定为 0.5mm ,允许偏差 -0.015mm 它的 正极( BP )的名义化学成分为铂铑合金,其中含铑 成分 30% ,含铂 成分 70% 它的 负极( BN )为铂铑合金,含铑量 6% 因此 铂铑热电偶 The diameter of the thermocouple wire is specified as 0.5mm , and the allowable deviation is -0.015mm . The nominal chemical composition of its positive electrode ( BP ) is platinum-rhodium alloy, which contains 30% rhodium and 70% platinum , and its negative ( BN ) is a platinum-rhodium alloy with a rhodium content of 6% , so it is called a double platinum-rhodium thermocouple . 长期最高使用温度为 1600 ℃,短期最高使用温度为 1800 ℃。 The long-term maximum use temperature of this thermocouple is 1600 ℃, and the short-term maximum use temperature is 1800 ℃.
     型热电偶在热电偶系列中具有 以下优点:( 1) 准确度最高 ;( 2) 稳定性最好 ;( 3) 测温温区宽 ;( 4) 使用寿命长 ;( 5) 测温上限高等。 The B -type thermocouple has the following advantages in the thermocouple series : ( 1) the highest accuracy ; ( 2) the best stability ; ( 3) a wide temperature range ; ( 4) a long service life ; ( 5) the upper temperature limit higher. 同时 也可 短期用于真空中,但 不适用于还原性气氛 含有金属或 非金属蒸气气氛中。 It is suitable for oxidizing and inert atmospheres, and can also be used in vacuum for a short period of time, but it is not suitable for reducing atmospheres and metal or non-metal vapor atmospheres. 型热电偶 与其他热电偶相比,有一个 明显的优点是不需用补偿导线进行补偿,因为在 0~50 ℃范围内热电势小于 3μV Compared with other thermocouples, the B -type thermocouple has an obvious advantage that it does not need to be compensated with a compensation wire, because the thermoelectric potential is less than 3μV in the range of 0 ~ 50 .
     热电偶 的缺点 :( 1) 热电势,热电势率较小 ;( 2) 灵敏读低 ;( 3) 高温下机械强度下降 ;( 4) 对污染非常敏感 ;( 5) 贵金属材料昂贵,一次性投资较大。 The shortcomings of B -type thermocouples are : ( 1) low thermoelectric potential and low thermoelectric potential ; ( 2) low sensitivity reading ; ( 3) reduced mechanical strength at high temperature ; ( 4) very sensitive to pollution ; ( 5) expensive precious metal Large one-time investment.