进口铠装热电偶、国产铠装热电偶结构和性能

2017/11/2 23:33:41 人评论 次浏览 分类:温度测量  文章地址://www.e-cumulus.com/tech/1589.html

昌晖仪表制造有限公司在本文介绍进口铠装热电偶和国产铠装热电偶结构和性能特点,对用户深入了解铠装热电偶测温和应用大有帮助,也可以作为技术培训的专业资料。

铠装热电偶电缆的型号、代号及分度号可参阅"铠装热电偶选型",铠装热电偶电缆结构尺寸如图1所示,它的外径(D)及公差、保护管名义壁厚(S)和偶丝名义直径(C)以及绝缘层厚度(t)应符合表1规定。
                                                          铠装热电偶结构尺寸
 
表1  铠装热电偶电缆尺寸(GB/T 18404-2001)


铠装热电偶电缆外径(D)标称值±公差       保护管壁厚度(S)最小值       偶丝直径(C)         绝缘层厚度(t)最小值
0.5±0.025mm                                        0.05mm                            0.08mm              0.04mm
1.0±0.025mm                                        0.10mm                            0.15mm              0.08mm
1.5±0.025mm                                        0.15mm                            0.23mm              0.12mm
2.0±0.025mm                                        0.20mm                            0.30mm              0.16mm
3.0±0.030mm                                        0.30mm                            0.45mm              0.24mm
4.5±0.045mm                                        0.45mm                            0.68mm              0.36mm
6.0±0.060mm                                        0.60mm                            0.90mm              0.48mm
8.0±0.080mm                                        0.80mm                            1.20mm              0.64mm

铠装热电偶的测量端有露端型、接壳型、绝缘型及分离式绝缘型等四种,它们的特点见表2.另外,为满足特殊场合的需要,还有圆变截面型、扁变截面型(图2)。在通常情况下多采用绝缘型,只有在要求高速响应或处于非腐蚀性气体中才用露端型。铠装热电偶还有多点结构,如图3所示
                          
扁变截面型铠装热电偶结构                                                  圆变截面型铠装热电偶结构


 表2     国产铠装热电偶电缆套管材料及铠装热电偶最高使用温度


产品名称                                       型号      推荐套管材料       外直径/mm                                       推荐最高工作温度/℃
铠装镍铬-镍硅热电偶电缆              KK        Inconcl 600         Φ0.5/Φ1.0                                        500
铠装镍铬-镍硅热电偶电缆              KK        Inconcl 600         Φ1.5/Φ2.0                                        800
铠装镍铬-镍硅热电偶电缆              KK        Inconcl 600         Φ3.0/Φ4.0/Φ4.5/Φ5.0                      900
铠装镍铬-镍硅热电偶电缆              KK        Inconcl 600         Φ6.0/Φ8.0                                        1100
铠装镍铬硅-镍硅镁热电偶电缆       KN        Inconcl 600         Φ0.5/Φ1.0                                        500
铠装镍铬硅-镍硅镁热电偶电缆       KN        Inconcl 600         Φ1.5/Φ2.0                                        800
铠装镍铬硅-镍硅镁热电偶电缆       KN        Inconcl 600         Φ3.0/Φ4.0/Φ4.5/Φ5.0                      900
铠装镍铬硅-镍硅镁热电偶电缆       KN        Inconcl 600         Φ6.0/Φ8.0                                        1100
铠装镍铬-镍硅热电偶电缆              KK        1Cr18Ni9Ti          Φ0.5/Φ1.0                                        400
铠装镍铬-镍硅热电偶电缆              KK        1Cr18Ni9Ti          Φ1.5/Φ2.0                                        600
铠装镍铬-镍硅热电偶电缆              KK        1Cr18Ni9Ti          Φ3.0/Φ4.0/Φ4.5/Φ5.0/Φ6.0/Φ8.0    800
铠装镍铬硅-镍硅镁热电偶电缆       KN        1Cr18Ni9Ti          Φ0.5/Φ1.0                                        400
铠装镍铬硅-镍硅镁热电偶电缆       KN        1Cr18Ni9Ti          Φ1.5/Φ2.0                                        600
铠装镍铬硅-镍硅镁热电偶电缆       KN        1Cr18Ni9Ti          Φ3.0/Φ4.0/Φ4.5/Φ5.0/Φ6.0/Φ8.0    800  
铠装镍铬-铜镍热电偶电缆              KE        1Cr18Ni9Ti          Φ0.5/Φ1.0                                        400
铠装镍铬-铜镍热电偶电缆              KE        1Cr18Ni9Ti          Φ1.5/Φ2.0                                        500
铠装镍铬-铜镍热电偶电缆              KE        1Cr18Ni9Ti          Φ3.0/Φ4.0/Φ4.5/Φ5.0                      600
铠装镍铬-铜镍热电偶电缆              KE        1Cr18Ni9Ti          Φ6.0/Φ8.0                                        800
铠装铁-铜镍热电偶电缆                  KJ        1Cr18Ni9Ti          Φ0.5/Φ1.0                                        300
铠装铁-铜镍热电偶电缆                  KJ        1Cr18Ni9Ti          Φ1.5/Φ2.0                                        400
铠装铁-铜镍热电偶电缆                  KJ        1Cr18Ni9Ti          Φ3.0/Φ4.0/Φ4.5/Φ5.0                      500
铠装铁-铜镍热电偶电缆                  KJ        1Cr18Ni9Ti          Φ6.0/Φ8.0                                        750
铠装铜-铜镍热电偶电缆                  KT       1Cr18Ni9Ti          Φ0.5/Φ1.0                                         200
铠装铜-铜镍热电偶电缆                 KT        1Cr18Ni9Ti          Φ1.5/Φ2.0/Φ3.0/Φ4.0/Φ4.5/Φ5.0     300
铠装铜-铜镍热电偶电缆                 KT        1Cr18Ni9Ti          Φ6.0/Φ8.0                                         400

表3     国产铠装热电偶使用温度范围及允差
允差等级              型号             分度号           允差值                                温度范围/℃  
Ⅰ级                     KK               K                   ±1.50℃或±0.4%t               -40~1100    
Ⅰ级                     KN              N                   ±1.50℃或±0.4%t               -40~1100
Ⅰ级                     KE               E                    ±1.50℃或±0.4%t               -40~800
Ⅰ级                     KJ                J                    ±1.50℃或±0.4%t               -40~750
Ⅰ级                     KT               T                    ±0.50℃或±0.4%t               -40~350
Ⅱ级                     KK               K                   ±2.50℃或±0.75%t             -40~1100    
Ⅱ级                     KN              N                   ±2.50℃或±0.75%t             -40~1100
Ⅱ级                     KE               E                    ±2.50℃或±0.75%t             -40~800
Ⅱ级                     KJ                J                    ±2.50℃或±0.75%t             -40~750
Ⅱ级                     KT               T                    ±1.0℃或±0.75%t               -40~350
Ⅲ级                     KK               K                   ±2.50℃或±1.5%t                -200~40    
Ⅲ级                     KN              N                   ±2.50℃或±1.5%t                -200~40
Ⅲ级                     KE               E                    ±2.50℃或±1.5%t               -200~40
Ⅲ级                     KT               T                    ±1.0℃或±1.5%t                 -200~40
 注:表中t为被测温度的绝对值

表4      美国铠装热电偶使用温度上限          [ASTM E608/E608M(2001)]
铠装热电偶电缆外径            T分度号            J分度号           E分度号            K、N分度号
 Φ0.5mm                            260℃               260℃             300℃               700℃
Φ1.0mm                             260℃               260℃             300℃               700℃
Φ1.5mm                             260℃               440℃             510℃               920℃
Φ2.0mm                             260℃               440℃             510℃               920℃
Φ3.0mm                             315℃               480℃             580℃               1070℃
Φ4.5mm                             370℃               620℃             730℃               1150℃
Φ6.0mm                             370℃               720℃             820℃               1150℃
Φ8.0mm                             370℃               620℃             730℃               1150℃

表5    美国铠装热电偶测温范围及允差       [ASTM E608/E608M(2001)]
铠装热电偶分度号                 测温范围                                 标准级允差                       精密级允差
T                                           0-350℃                                 ±1℃或0.75%t                 ±0.5℃或0.4%t
J                                            0-750℃                                 ±2.2℃或0.75%t              ±1.1℃或0.4%t
E                                           0-900℃                                 ±1.7℃或0.5%t                ±1℃或0.4%t
K                                           0-1250℃                               ±2.2℃或0.75%t              ±1.1℃或0.4%t
T                                           -200~0℃                              ±1℃或1.5%t
E                                           -200~0℃                              ±1.7℃或1%t
K,N                                     -200~0℃                              ±2.2℃或2%t

 

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