1、工業(yè)鉑、銅熱電阻校準(zhǔn)規(guī)程作者:日期:1目的規(guī)范鉑、銅熱電阻校準(zhǔn)的操作，確保鉑、銅熱電阻的校準(zhǔn)結(jié)果真實(shí)、可靠。2范圍本規(guī)程適用于-200C +850C整個(gè)或部分溫度范圍使用的工業(yè)鉑、銅熱電阻的校準(zhǔn)和使用 中檢驗(yàn)。3職責(zé)工程設(shè)備部：負(fù)責(zé)按本規(guī)程執(zhí)行鉑、銅熱電阻的校準(zhǔn)及校準(zhǔn)記錄的管理。4定義4.1熱電阻：由一個(gè)或多個(gè)感溫電阻元件組成的，帶引線、保護(hù)管和接線端子的測(cè)溫儀 器。4.2標(biāo)稱電阻值R0:熱電阻（或感溫元件）在0°C時(shí)的期望電阻值。其阻值通常有10 50為100為500Q、1000Q,它由制造商申明并標(biāo)于熱電阻上。感溫元件常以其標(biāo)稱電阻 值表征，例如一個(gè)Pt100的感溫元件，其標(biāo)稱電

2、阻值為100Q; Cu50的感溫元件，其標(biāo)稱 電阻值為50 Qo4.3溫度/電阻表（分度表）：當(dāng)R0為標(biāo)稱電阻值時(shí)，可根據(jù)函數(shù)關(guān)系制成相應(yīng)的溫度 / 電阻表（分度表）。鉑熱電阻標(biāo)稱電阻值為100Q的分度表見(jiàn)表2。其他類型鉑熱電阻的 分度表只要將該分度表中的電阻值乘以 R0/100Q即可（此處的R0為其他類型鉑熱電阻 的標(biāo)稱電阻值）。銅熱電阻分度表亦是如此得到。5內(nèi)容5.1允差：允差等級(jí)是與有效溫度范圍相對(duì)應(yīng)的。在有效溫度范圍內(nèi)，熱電阻的電阻值 通過(guò)分度表查算出的溫度t與真實(shí)溫度的最大偏差不得超過(guò)表 1給定的允差值。表1適 用于任何標(biāo)稱電阻值的熱電阻。對(duì)于特定的熱電阻，若其有效溫度范圍小于該表規(guī)

3、定的 范圍，應(yīng)給予說(shuō)明。表1熱電阻的允差等級(jí)和允差值熱電阻類型允差等級(jí)有效溫度范圍/C允差值線繞元件膜式元件PRTA-100+450-30+300±).150C +0.002|t|B-196+600-50+500±).30C +0.005|t|C-196+600-50+600±).6C +0.010|t|CRT-50+150-±).30C +0.006|t|5.2溫度/電阻關(guān)系表2 Pt100鉑熱電阻的溫度/電阻關(guān)系t/ C0123456789電阻值（Q）-20018.52-19022.8322.4021.9721.5421.1120.6820.2519

4、.8219.3818.95-18027.1026.6726.2425.8225.3924.9724.5424.1123.6823.25-17031.3430.9130.4930.0729.6429.2228.8028.3727.9527.52-16035.5435.1234.7034.2833.8633.4433.0232.6032.1831.76-15039.7239.3138.8938.4738.0537.6437.2236.8036.3835.96-14043.8843.4643.0542.6342.2241.8041.3940.9740.5640.14-13048.0047.5947.

5、1846.7746.3645.9445.5345.1244.7044.29-12052.1151.7051.2950.8850.4750.0649.6549.2448.8348.42-11056.1955.7955.3854.9754.5654.1553.7553.3452.9352.52-10060.2659.8559.4459.0458.6358.2357.8257.4157.0156.60-9064.3063.9063.4963.0962.6862.2861.8861.4761.0760.66-8068.3367.9267.5267.1266.7266.3165.9165.5165.11

6、64.70-7072.3371.9371.5371.1370.7370.3369.9369.5369.1368.73-6076.3375.9375.5375.1374.7374.3373.9373.5373.1372.73-5080.3179.9179.5179.1178.7278.3277.9277.5277.1276.73-4084.2783.8783.4883.0882.6982.2981.8981.5081.1080.70-3088.2287.8387.4387.0486.6486.2585.8585.4685.0684.67-2092.1691.7791.3790.9890.5990

7、.1989.8089.4089.0188.62-1096.0995.6995.3094.9194.5294.1293.7393.3492.9592.55-0100.0099.6199.2298.8398.4498.0497.6597.2696.8796.480100.00100.39100.78101.17101.56101.95102.34102.73103.12103.5110103.90104.29104.68105.07105.46105.85106.24106.63107.02107.4020107.79108.18108.57108.96109.35109.73110.12110.

8、51110.90111.2930111.67112.06112.45112.83113.22113.61114.00114.38114.77115.1540115.54115.93116.31116.70117.08117.47117.86118.24118.63119.0150119.40119.78120.17120.55120.94121.32121.71122.09122.47122.8660123.24123.63124.01124.39124.78125.16125.54125.93126.31126.6970127.08127.46127.84128.22128.61128.99

9、129.37129.75130.13130.5280130.90131.28131.66132.04132.42132.80133.18133.57133.95134.3390134.71135.09135.47135.85136.23136.61136.99137.37137.75138.13100138.51138.88139.26139.64140.02140.40140.78141.16141.54141.91110142.29142.67143.05143.43143.80144.18144.56144.94145.31145.69120146.07146.44146.82147.2

10、0147.57147.95148.33148.70149.08149.46130149.83150.21150.58150.96151.33151.71152.08152.46152.83153.21140153.58153.96154.33154.71155.08155.46155.83156.20156.58156.95150157.33157.70158.07158.45158.82159.19159.56159.94160.31160.68160161.05161.43161.80162.17162.54162.91163.29163.66164.03164.40170164.7716

11、5.14165.51165.89166.26166.63167.00167.37167.74168.11180168.48168.85169.22169.59169.96170.33170.70171.07171.43171.80190172.17172.54172.91173.28173.65174.02174.38174.75175.12175.49200175.86176.22176.59176.96177.33177.69178.06178.43178.79179.16210179.53179.89180.26180.63180.99181.36181.72182.09182.4618

12、2.82220183.19183.55183.92184.28184.65185.01185.38185.74186.11186.47230186.84187.20187.56187.93188.29188.66189.02189.38189.75190.11240190.47190.84191.20191.56191.92192.29192.65193.01193.37193.74t/°C0123456789電阻值（Q）250194.10194.46194.82195.18195.55195.91196.27196.63196.99197.35260197.71198.07198.

13、43198.79199.15199.51199.87200.23200.59200.95270201.31201.67202.03202.39202.75203.11203.47203.83204.19204.55280204.90205.26205.62205.98206.34206.70207.05207.41207.77208.13290208.48208.84209.20209.56209.91210.27210.63210.98211.34211.70300212.05212.41212.76213.12213.48213.83214.19214.54214.90215.253102

14、15.61215.96216.32216.67217.03217.38217.74218.09218.44218.80320219.15219.51219.86220.21220.57220.92221.27221.63221.98222.33330222.68223.04223.39223.74224.09224.45224.80225.15225.50225.85340226.21226.56226.91227.26227.61227.96228.31228.66229.02229.37350229.72230.07230.42230.77231.12231.47231.82232.172

15、32.52232.87360233.21233.56233.91234.26234.61234.96235.31235.66236.00236.35370236.70237.05237.40237.74238.09238.44238.79239.13239.48239.83380240.18240.52240.87241.22241.56241.91242.26242.60242.95243.29390243.64243.99244.33244.68245.02245.37245.71246.06246.40246.75400247.09247.44247.78248.13248.47248.

16、81249.16249.50245.85250.19410250.53250.88251.22251.56251.91252.25252.59252.93253.28253.62420253.96254.30254.65254.99255.33255.67256.01256.35256.70257.04430257.38257.72258.06258.40258.74259.08259.42259.76260.10260.44440260.78261.12261.46261.80262.14262.48262.82263.16263.50263.84450264.18264.52264.862

17、65.20265.53265.87266.21266.55266.89267.22460267.56267.90268.24268.57268.91269.25269.59269.92270.26270.60470270.93271.27271.61271.94272.28272.61272.95273.29273.62273.96480274.29274.63274.96275.30275.63275.97276.30276.64276.97277.31490277.64277.98278.31278.64278.98279.31279.64279.98280.31280.64500280.

18、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.

19、83297.16550297.49297.81298.14298.47298.80299.12299.45299.78300.10300.43560300.75301.08301.41301.73302.06302.38302.71303.03303.36303.69570304.01304.34304.66304.98305.31305.63305.96306.28306.61306.93580307.25307.58307.90308.23308.55308.87309.20309.52309.84310.16590310.49310.81311.13311.45311.78312.103

20、12.42312.74313.06313.39600313.71314.03314.35314.67314.99315.31315.64315.96316.28316.60610316.92317.24317.56317.88318.20318.52318.84319.16319.48319.80620320.12320.43320.75321.07321.39321.71322.03322.35322.67322.98630323.30323.62323.94324.26324.57324.89325.21325.53325.84326.16640326.48326.79327.11327.

21、43327.74328.06328.38328.69329.01329.32650329.64329.96330.27330.59330.90331.22331.53331.85332.16332.48660332.79表3 CulOO銅熱電阻的溫度/電阻關(guān)系t/°C0123456789電阻值（Q）-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.

22、2688.8388.4087.9787.54-1095.7195.2894.8594.4293.9993.5693.1392.7092.2791.84-0100.0099.5799.1498.7198.2897.8597.4297.0096.5796.140100.00100.43100.86101.29101.72102.14102.57103.00103.42103.8610104.29104.72105.14105.57106.00106.43106.86107.29107.72108.1420108.57109.00109.43109.86110.28110.71111.14111.5

23、7112.00112.4230112.85113.28113.71114.14114.56114.99115.42115.85116.27116.7040117.13117.56117.99118.41118.84119.27119.70120.12120.55120.9850121.41121.84122.26122.69123.12123.55123.97124.40124.83125.2660125.68126.11126.54126.97127.40127.82128.25128.68129.11129.5370129.96130.39130.82131.24131.67132.101

24、32.53132.96133.38133.8180134.24134.67135.09135.52135.95136.38136.81137.23137.66138.0990138.52138.95139.37139.80140.23140.66141.09141.52141.94142.37100142.80143.23143.66144.08144.51144.94145.37145.80146.23146.66110147.08147.51147.94148.37148.80149.23149.66150.09150.52150.94120151.37151.80152.23152.66

25、153.09153.52153.95154.38154.81155.24130155.67156.10156.52156.95157.38157.81158.24158.67159.10159.53140159.96160.39160.82161.25161.68162.12162.55162.98163.41163.84150164.275.3外觀5.3.1熱電阻各部分裝配正確、可靠、無(wú)缺件，外表涂層應(yīng)牢固，保護(hù)管應(yīng)完整無(wú)損， 不得有凹痕、劃痕和顯著銹蝕。5.3.2感溫元件不得破裂，不得有明顯的彎曲現(xiàn)象。5.3.3根據(jù)測(cè)量電路的需要，熱電阻可以有兩、三或四線制的接線方式，其中 A級(jí)的熱 電阻

26、必須是三線制或四線制的接線方式。5.3.4每支熱電阻在其保護(hù)套管上或在其所附的標(biāo)簽上至少應(yīng)有下列內(nèi)容的標(biāo)識(shí)：類型 代號(hào)、標(biāo)稱電阻值 R0、有效溫度范圍、感溫元件數(shù)、允差等級(jí)、制造商名或商標(biāo)、生 產(chǎn)年月。5.4校準(zhǔn)條件5.4.1標(biāo)準(zhǔn)器541.1對(duì)標(biāo)準(zhǔn)器的誤差要求：從提高校準(zhǔn)能力出發(fā)，標(biāo)準(zhǔn)儀器及配套設(shè)備引入的擴(kuò)展 不確定度與被校熱電阻最大允許誤差絕對(duì)值相比應(yīng)盡可能小。5.4.1.2選用標(biāo)準(zhǔn)器如下：二等標(biāo)準(zhǔn)水銀溫度計(jì)（-30+300）C,過(guò)程校準(zhǔn)儀。5.4.1.3輔助設(shè)備如下：恒溫槽。5.4.2環(huán)境條件5.4.2.1 環(huán)境溫度：1535C；5.4.2.2 環(huán)境濕度：3080%;5.4.2.3電測(cè)設(shè)備

27、應(yīng)符合相應(yīng)的環(huán)境要求。5.4.2.4無(wú)腐蝕性氣體。5.5校準(zhǔn)項(xiàng)目和校準(zhǔn)方法5.5.1外觀：按5.3的要求檢查熱電阻和感溫元件的保護(hù)套管外部，應(yīng)無(wú)肉眼可見(jiàn)的損 傷。同時(shí)按5.3.4的要求檢查標(biāo)識(shí)、檢定標(biāo)記等，確定熱電阻是否符合管理性的要求。5.5.2允差的校準(zhǔn)：各等級(jí)熱電阻的校準(zhǔn)點(diǎn)均選擇0C和100C。5.5.3熱電阻阻值的測(cè)量方法：熱電阻的電阻值應(yīng)從整支熱電阻的接線端子起計(jì)算。測(cè) 量順序如下：“標(biāo)準(zhǔn)被校1被校2被校n被校n 被校2被校1標(biāo)準(zhǔn)”， 如此完成一個(gè)循環(huán)，每次測(cè)量不得少于兩個(gè)循環(huán)，取其平均值進(jìn)行計(jì)算。5.5.4 R0的校準(zhǔn)：在恒溫槽中測(cè)量熱電阻的電阻值，并與標(biāo)準(zhǔn)器測(cè)量的溫度進(jìn)行比較， 計(jì)算其0C的偏差值t0,校準(zhǔn)時(shí)必須要有足夠的熱平衡時(shí)間，待測(cè)量數(shù)據(jù)穩(wěn)定后方可 讀數(shù)，熱電阻應(yīng)有足夠的插入深度，盡可能減少熱損失。5.5.5 R0的計(jì)算：恒溫槽偏離0°C的值 t由標(biāo)準(zhǔn)溫度計(jì)測(cè)量得到其值按公式(1)計(jì)算： t=t0 + t修(1)式中：t0標(biāo)準(zhǔn)溫度計(jì)在恒溫槽中測(cè)得的溫度值；t修-標(biāo)準(zhǔn)溫度計(jì)在0C時(shí)的