工业铂、铜热电阻校准规程

工业铂、铜热电阻校准规程LT目的标准铂、铜热电阻校准的操作，确保铂、铜热电阻的校准结果真实、可靠。范围本规程适用于-200°C~+850°C整个或局部温度范围使用的工业铂、铜热电阻的校准和使用中检验。职责工程设备部：负责按本规程执行铂、铜热电阻的校准及校准记录的管理。定义热电阻：由一个或多个感温电阻元件组成的，带引线、保护管和接线端子的测温仪器。4.2标称电阻值R0：热电阻〔或感温元件〕在0C时的期望电阻值。其阻值通常有10Q、50Q、100Q、500Q、1000Q,它由制造商申明并标于热电阻上。感温元件常以其标称电阻值表征，例如一个Pt10O的感温元件，其标称电阻值为100Q；Cu50的感温元件，其标称电阻值为50Q。4.3温度/电阻表〔分度表〕：当R0为标称电阻值时，可根据函数关系制成相应的温度/电阻表〔分度表〕。铂热电阻标称电阻值为100Q的分度表见表2。其他类型铂热电阻的分度表只要将该分度表中的电阻值乘以R0/100Q即可］此处的R0为其他类型铂热电阻的标称电阻值〕。铜热电阻分度表亦是如此得到。内容允差：允差等级是与有效温度范围相对应的。在有效温度范围内，热电阻的电阻值通过分度表查算出的温度t与真实温度的最大偏差不得超过表1给定的允差值。表1适用于任何标称电阻值的热电阻。对于特定的热电阻，假设其有效温度范围小于该表规定的范围，应给予说明。表1热电阻的允差等级和允差值热电阻类型允差等级有效温度范围/°c允差值线绕元件膜式元件PRTA-100~+450-30~+300±0.150C+0.002ltlB-196~+600-50~+500±0.30C+0.005ltlC-196~+600-50~+600±0.6C+0.010ltlCRT■-50~+150■±0.30C+0.006ltl5.2温度/电阻关系表2Pt100铂热电阻的温度/电阻关系t/c0123456789电阻彳直9)-20018.52-19022.8322.4021.9721.5421.1120.6820.2519.8219.3818.95-18027.1026.6726.2425.8225.3924.9724.5424.1123.6823.25-17031.3430.9130.4930.0729.6429.2228.8028.3727.9527.52-16035.5435.1234.7034.2833.8633.4433.0232.6032.1831.76-15039.7239.3138.8938.4738.0537.6437.2236.8036.3835.96寸6CMCMOlCMkIO9oo>cicoknnssCDOCOCOCO9卜卜卜卜oo>cico999卜卜o卜cminco卜99invocdci<6COCOCO66lo6gl10kCMlO・・・・・CO卜lIO6OOLLL96CMCOCOCO910COl&<oocoCMCMCOCOCOL69L1069寸CXI6■■■■■lin6cog寸寸寸IOIO160.68164.40168.11171.80175.49179.16182.82186.47190.11193.746a197.35200.95204.55208.13211.70IOOCOIO卜CMCOCOCOCO10cdoi100)llCMCMCMCMCMCMCMCM9oCOCOlg卜co6o■■■■■OnCOCM卜V001010占lCOCOCM■■■■■lS6CO卜999卜卜o9lin卜1-：in0)ci(600000066CMCMO卜COlO6卜9■■■■■E卜O寸COOOLLL卜LCOIOIO寺COl6卜■■■■■CM9OE卜CMCMCOCOCO141.54145.31149.08152.83156.58LCOkCO0COO卜nl■■■■■ok卜lg999卜卜178.79182.46186.11189.75193.37CO196.99200.59204.19207.77211.34214.90218.44221.98225.50229.02卜cmbblO>CMCOoin0)cok：Vnn1010卜lCOCOCMIOIOIOIO■■■■■lS6CO卜999卜卜O9Ob9SVVCOCM■■■■■lID6CO卜00000066EElCO寸卜9IOCOCM■■■■■CM9O寸COOOLLL6COU>卜卜O6卜IOCOoiido>coi<CMCMCMCOCO90090l6卜■寸Cl■■■■■l0COCM9bbbinin159.94163.66167.37171.07174.75178.43182.09185.74189.38193.01卜196.63200.23203.83207.41210.98214.54218.09221.63225.15228.660>coinincmcoiog卜co■■■■■lS6CO卜V001010COi-COCOCM86666■■■■■lS6CO卜999卜卜6inocoinCOCOCO卜9■■■■■LID6CO卜0000006600CMO9COCMlOCO■■■■■CM9O寸卜OOLLLl寸卜《CO6卜gcol6■■■■■lIO6CO9CMCMCMCOCOco<0cococoh-IOCOOCO■■■■■O0COCM0bbbinin159.56163.29167.00170.70174.38178.06181.72185.38189.02192.659196.27199.87203.47207.05210.63214.19217.74221.27224.80228.31ongiocoCO6OlCXI■■■■■Lsonco寸kgggCO1-COCOCMCMCOCOCOCO■■■■■CXI9OnCO99卜卜卜6S6CMV00LLO■■■■■CM9O0CDCOCO666101.95105.85109.73113.61117.47CM96OlCOl6CO9l-1incdci<6CMCMCMCOCO140.40144.18147.95151.71155.460)1-COCOCMl69COO■■■■■6CM9Obtf)99卜卜69l969COO9CMl<l-1IOCO&卜COCOCO6IO195.91199.51203.11206.70210.27213.83217.38220.92224.45227.96CXI9卜9ECMCOVg9■■■■■CM9OkCO寸寸IOIOIOCOCMCOCOCM9卜卜卜卜■■■■■CM9OVCO99卜卜卜6k6CMk99IOIOk■■■■■C\l9O0COCOCO666COCOIDCMCOm寸cogio・・・・・lg6co卜OOOLL120.94124.78128.61132.42136.23CMO卜CO00ocomcoo■■■■■oco卜linkkkssCMk99IOCOtf)CM69cociCOO)CO999卜177.33180.99184.65188.29191.92寸-tf195.55199.15202.75206.34209.91213.48217.03220.57224.09227.61E卜CO卜n9卜CO6O■■■■■CM9Ok6寸寸IOIOIO6CMCOCOlOLLLL■■■■■co卜ls699卜卜卜0000i-«OO66CO■■■■■co卜oncoCOCO666卜卜9COOlO6CO卜idcdoicoOOOLLIO0>CM寸IDincocmocoocdoiidCMCMCMCOCO139.64143.43147.20150.96154.71IO卜66CO17coincmcdci100)co999卜176.96180.63184.28187.93191.56CO195.18198.79202.39205.98209.56213.12216.67220.21223.74227.26SCO6CO0OlCMCOk■■■■■CO卜ltf>6寸寸IOIOIO6CMCOCOlVIOIOIOIO■■■■■CO卜lIO699卜卜卜cocor-iocmnnCOCOCM■■■■■CO卜lS6COCO666coco卜gl卜9ID寸COocdoi<6OOOLL120.17124.01127.84131.66135.47CDIDCMCOCOcmocomco■■■■■6CO9OkCO1010158.07161.80165.51169.22172.91176.59180.26183.92187.56191.20CM194.82198.43202.03205.62209.20212.76216.32219.86223.39226.9196069寸ID卜卜CO■■■■■CO卜lIO6nninininOCXIEEl0>0>0>0>0>CO卜lIO699卜卜卜卜CO卜6lCOCO卜99■■■■■CO卜lIO6COCO66666CO9COCOCMlO6oco&idOOOLLCOE9CO6卜9寸CMO・・・・・6co卜lglCMCMECOCO卜0l9CO9寸CXI6cdoi<0ocoCO寸寸IOs157.70161.43165.14168.85172.54176.22179.89183.55187.20190.84L194.46198.07201.67205.26208.84212.41215.96219.51223.04226.56COOl69COOllCMc*5o>cicookngg9OCOCOCOCOCOCOCOCOo>cicoo99卜卜CO卜CM96gCMCM1-OHcoci<62COCO66OOO6卜kO6卜9s■■■■・OCO卜lsOOOLLO^-COOi-寸GlO6卜■■■■・6E卜O寸lC\lC\lCOEl6卜CO00iqcmocoincdcicdo)coconnnin157.33161.05164.77168.48172.17175.86179.53183.19186.84190.47O194.10197.71201.31204.90208.48212.05215.61219.15222.68226.21oooooVCOCMloLLLLLooooo6CO卜9gOOOOoCOCMioooooOLCMCO寺OOOOOIO9卜006oooooOlCMcongssss00000O1-CMCOkCMCMCMCMCM00000g9卜006CMCMCMCMCM00000OlCMCOkCOCOCOCOCO350229.72230.07230.42230.77231.12231.47231.82232.17232.52232.87360233.21233.56233.91234.26234.61234.96235.31235.66236.00236.35370236.70237.05237.40237.74238.09238.44238.79239.13239.48239.83380240.18240.52240.87241.22241.56241.91242.26242.60242.95243.29390243.64243.99244.33244.68245.02245.37245.71246.06246.40246.75400247.09247.44247.78248.13248.47248.81249.16249.50245.85250.19410250.53250.88251.22251.56251.91252.25252.59252.93253.28253.62420253.96254.30254.65254.99255.33255.67256.01256.35256.70257.04430257.38257.72258.06258.40258.74259.08259.42259.76260.10260.44440260.78261.12261.46261.80262.14262.48262.82263.16263.50263.84450264.18264.52264.86265.20265.53265.87266.21266.55266.89267.22460267.56267.90268.24268.57268.91269.25269.59269.92270.26270.60470270.93271.27271.61271.94272.28272.61272.95273.29273.62273.96480274.29274.63274.96275.30275.63275.97276.30276.64276.97277.31490277.64277.98278.31278.64278.98279.31279.64279.98280.31280.64500280.98281.31281.64281.98282.31282.64282.97283.31283.64283.97510284.30284.63284.97285.30285.63285.96286.29286.62286.85287.29520287.62287.95288.28288.61288.94289.27289.60289.93290.26290.59530290.92291.25291.58291.91292.24292.56292.89293.22293.55293.88540294.21294.54294.86295.19295.52295.85296.18296.50296.83297.16550297.49297.81298.14298.47298.80299.12299.45299.78300.10300.43560300.75301.08301.41301.73302.06302.38302.71303.03303.36303.69570304.01304.34304.66304.98305.31305.63305.96306.28306.61306.93580307.25307.58307.90308.23308.55308.87309.20309.52309.84310.16590310.49310.81311.13311.45311.78312.10312.42312.74313.06313.39600313.71314.03314.35314.67314.99315.31315.64315.96316.28316.60610316.92317.24317.56317.88318.20318.52318.84319.16319.48319.80620320.12320.43320.75321.07321.39321.71322.03322.35322.67322.98630323.30323.62323.94324.26324.57324.89325.21325.53325.84326.16640326.48326.79327.11327.43327.74328.06328.38328.69329.01329.32650329.64329.96330.27330.59330.90331.22331.53331.85332.16332.48660332.79表3Cu100铜热电阻的温度/电阻关系t/C0123456789电阻彳直9)-5078.48-4082.8082.3781.9481.5181.0780.6480.2179.7879.3578.92-3087.1186.6886.2585.8285.3984.9684.5284.0683.6683.23-2091.4190.9890.5590.1289.6989.2688.8388.4087.9787.54-1095.7195.2894.8594.4293.9993.5693.1392.7092.2791.84-0100.0099.5799.1498.7198.2897.8597.4297.0096.5796.140100.00100.43100.86101.29101.72102.14102.57103.00103.42103.8610104.29104.72105.14105.57106.00106.43106.86107.29107.72108.1420108.57109.00109.43109.86110.28110.71111.14111.57112.00112.4230112.85113.28113.71114.14114.56114.99115.42115.85116.27116.7040117.13117.56117.99118.41118.84119.27119.70120.12120.55120.9850121.41121.84122.26122.69123.12123.55123.97124.40124.83125.2660125.68126.11126.54126.97127.40127.82128.25128.68129.11129.5370129.96130.39130.82131.24131.67132.10132.53132.96133.38133.8180134.24134.67135.09135.52135.95136.38136.81137.23137.66138.0990138.52138.95139.37139.80140.23140.66141.09141.52141.94142.37100142.80143.23143.66144.08144.51144.94145.37145.80146.23146.66110147.08147.51147.94148.37148.80149.23149.66150.09150.52150.94120151.37151.80152.23152.66153.09153.52153.95154.38154.81155.24130155.67156.10156.52156.95157.38157.81158.24158.67159.10159.53140159.96160.39160.82161.25161.68162.12162.55162.98163.41163.84150164.275.3外观热电阻各局部装配正确、可靠、无缺件，外表涂层应牢固，保护管应完整无损，不得有凹痕、划痕和显著锈蚀。感温元件不得破裂，不得有明显的弯曲现象。5.3.3根据测量电路的需要，热电阻可以有两、三或四线制的接线方式，其中A级的热电阻必须是三线制或四线制的接线方式。每支热电阻在其保护套管上或在其所附的标签上至少应有以下内容的标识：类型代号、标称电阻值R0、有效温度范围、感温元件数、允差等级、制造商名或商标、生产年月。校准条件标准器对标准器的误差要求：从提高校准能力出发，标准仪器及配套设备引入的扩展不确定度与被校热电阻最大允许误差绝对值相比应尽可能小。5.4.1.2选用标准器如下：二等标准水银温度计〔-3O~+30O〕°C,过程校准仪。5.4.1.3辅助设备如下：恒温槽。环境条件环境温度：15~35C；环境湿度：30~80%；电测设备应符合相应的环境要求。无腐蚀性气体。校准工程和校准方法外观：按5.3的要求检查热电阻和感温元件的保护套管外部，应无肉眼可见的损伤。同时按5.3.4的要求检查标识、检定标记等，确定热电阻是否符合管理性的要求。5.5.2允差的校准：各等级热电阻的校准点均选择0C和1O0C。热电阻阻值的测量方法：热电阻的电阻值应从整支热电阻的接线端子起计算。测量顺序如下：“标准f被校—被校2~・・—被校nf被校nf—被校2~被校—标准〞，如此完成一个循环，每次测量不得少于两个循环，取其平均值进行计算。5.5.4R0的校准：在恒温槽中测量热电阻的电阻值，并与标准器测量的温度进行比拟，计算其0C的偏差值△t0,校准时必须要有足够的热平衡时间，待测量数据稳定前方可读数，热电阻应有足够的插入深度，尽可能减少热损失。R0的计算：恒温槽偏离0C的值△t由标准温度计测量得到其值按公式⑴计算：