液體恒溫試驗設(shè)備測試規(guī)范試驗報告
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液體恒溫試驗設(shè)備測試規(guī)范試 驗 報 告液體恒溫試驗設(shè)備測試規(guī)范起草小組2019年5月目錄一、液體恒溫試驗設(shè)備 (1)二、試驗?zāi)康?(1)三、測量標(biāo)準(zhǔn)及試驗設(shè)備 (1)四、試驗內(nèi)容 (2)五、試驗結(jié)論 (14)一、液體恒溫試驗設(shè)備液體恒溫試驗設(shè)備能夠提供滿足要求的溫度環(huán)境,用于樣品的濃縮、蒸餾、加熱和其他溫度試驗,在生物、環(huán)保、醫(yī)藥、生化等科研實驗室和工業(yè)生產(chǎn)領(lǐng)域均有廣泛的應(yīng)用。隨著科學(xué)技術(shù)的進(jìn)步和制造業(yè)的發(fā)展,液體恒溫試驗設(shè)備不僅具有優(yōu)越的溫度性能,而且操作簡便、使用安全。結(jié)合成熟的溫度控制系統(tǒng),其具有較高的自動控制程度,能夠?qū)崿F(xiàn)自動溫控,利于提高工作效率和產(chǎn)品質(zhì)量。液體恒溫試驗設(shè)備結(jié)構(gòu)簡單,易于生產(chǎn)和普遍獲得,具有良好的應(yīng)用前景。液體恒溫試驗設(shè)備用于提供準(zhǔn)確、穩(wěn)定的溫度場,它的計量性能優(yōu)劣直接關(guān)系到科研試驗結(jié)果或產(chǎn)品質(zhì)量。因此,液體恒溫試驗設(shè)備計量特性的校準(zhǔn)具有重要的應(yīng)用意義和極大的市場需求。液體恒溫試驗設(shè)備(以下簡稱設(shè)備)是實驗室用于樣品加熱或其他溫度實驗的常用設(shè)備,設(shè)備一般由槽體、加熱(制冷)器和溫控系統(tǒng)三部分組成。槽體一般為長方體或圓柱體。設(shè)備所使用的液體介質(zhì)一般根據(jù)使用的溫度范圍和使用需要來選擇,常見的液體介質(zhì)有水、乙醇、硅油、防凍液等。二、試驗?zāi)康恼莆找后w恒溫試驗設(shè)備的工作原理和技術(shù)參數(shù),選擇適合的標(biāo)準(zhǔn)器和配套設(shè)備,通過合理的試驗方法、試驗步驟,從液體恒溫試驗設(shè)備的溫度偏差、溫度均勻度、溫度波動度的技術(shù)指標(biāo)來驗證本規(guī)范的合理性、可行性和適用性。液體恒溫試驗設(shè)備主要有:數(shù)顯恒溫水浴鍋、高精度恒溫槽等。三、測量標(biāo)準(zhǔn)及試驗設(shè)備3.1測量標(biāo)準(zhǔn)設(shè)備見表1。表1 測量標(biāo)準(zhǔn)序號儀器名稱型號1A級鉑電阻Pt100溫度范圍(-80300)修正后最大誤差小于0.152溫度巡檢儀PR2053.2液體恒溫試驗設(shè)備選用電熱恒溫水浴鍋,高精度恒溫槽等不同的液體恒溫試驗設(shè)備進(jìn)行試驗。3.2.1電熱恒溫水浴鍋電熱恒溫水浴鍋槽體一般為長方體。槽體底部設(shè)有電熱管和托架,電熱管內(nèi)裝有電爐絲并用絕緣材料包裹,有導(dǎo)線連接溫度控制器,溫度控制器的全部電器部件均裝在水浴鍋的電器箱內(nèi),一般采用數(shù)字顯示智能控溫。電熱恒溫水浴鍋特點是操作簡單,價格低廉,使用安全,但是一般不具備攪拌(射流)功能,均勻度較差。3.2.2 高精度恒溫水槽高精度恒溫槽槽體一般為長方體或圓柱體。槽體內(nèi)設(shè)有加熱(制冷)器及攪拌(射流)裝置。溫控系統(tǒng)對加熱(制冷)器自動調(diào)節(jié),設(shè)備因熱量向外擴(kuò)散等原因使槽體內(nèi)溫度低于(高于)設(shè)定值時,使加熱(制冷)器工作,到體系再次達(dá)到設(shè)定的溫度時,又自動停止工作。通過攪拌設(shè)備使槽體內(nèi)溫度均勻。高精度恒溫槽控溫特點是控溫精度高,溫度均勻性度好。3.3測量系統(tǒng)測量系統(tǒng)由9支A級鉑電阻及PR205巡檢儀組成,分辨力為0.001,顯示溫度為修正后數(shù)值。圖 PR205溫度巡檢儀及A級鉑電阻四、實驗內(nèi)容1.液體恒溫試驗設(shè)備溫度參數(shù)試驗1.1測量點的位置及數(shù)量設(shè)備的工作空間一般應(yīng)由制造商提供的產(chǎn)品說明書規(guī)定。若產(chǎn)品說明未規(guī)定工作空間,則應(yīng)根據(jù)表2確定工作空間。如果加熱(制冷)裝置位于槽體的底部或側(cè)面,工作空間的計算應(yīng)從加熱(制冷)裝置靠近工作空間的表面開始計算。如槽體具有擋板、隔板等隔離設(shè)施,則從擋板、隔板開始計算。一般情況下,工作空間上表面距離液面不應(yīng)少于30mm。表2槽體尺寸距底面、液面(或隔板)距槽壁(或擋板、加熱器、冷卻器)長方體槽體:W*D*H0.15H0.15W或0.15D圓柱體槽體:Dia*H0.15H0.15 Dia注:以操作者正常操作為基點,W表示槽體左右方向尺寸,D表示槽體前后方向尺寸,H表示液體介質(zhì)液位的高度,Dia表示槽體的直徑。當(dāng)工作空間為長方體時,傳感器一般應(yīng)布置在工作空間的八個角點及幾何中心點共9個測量點,如圖2所示。當(dāng)工作空間為圓柱體時,應(yīng)布置在工作空間上下平面的四個象限點及工作空間幾何中心點共9個測量點,如圖3所示。圖2槽體為長方體時布點示意圖圖3 槽體為圓柱體時布點示意圖液體恒溫實驗設(shè)備也可根據(jù)實際需要或用戶要求確定測量點位置及數(shù)量并圖示說明。1.2數(shù)據(jù)處理1.2.1溫度偏差 (1) (2) 式中:溫度上偏差,;溫度下偏差,;各測量點規(guī)定時間內(nèi)測量的最高溫度,;各測量點規(guī)定時間內(nèi)測量的最低溫度,;設(shè)備設(shè)定溫度,。1.2.2 溫度均勻度 液體恒溫試驗設(shè)備在穩(wěn)定狀態(tài)下,工作空間各測量點15min內(nèi)(每1min測試一次)每次測量中實測最高溫度與最低溫度之差的算術(shù)平均值。(3)式中:溫度均勻度,;各測量點在第次測得的最高溫度,;各測量點在第次測得的最低溫度,;測量次數(shù)。1.2.3 溫度波動度液體恒溫試驗設(shè)備在穩(wěn)定狀態(tài)下,工作空間各測量點15min內(nèi)(每1min測試一次)實測最高溫度與最低溫度之差的一半,冠以“”號,取全部測量點中變化量的最大值作為溫度波動度校準(zhǔn)結(jié)果。(4)式中:溫度波動度,;測量點在次測量中的最高溫度,;測量點在次測量中的最低溫度,。1.3試驗數(shù)據(jù)對幾臺液體恒溫試驗設(shè)備的溫度參數(shù)進(jìn)行試驗,試驗結(jié)果如下所示1.3.1雙列四孔水浴表3雙列四孔水浴60試驗數(shù)據(jù)雙列四孔水浴 設(shè)定60測量 次數(shù)顯示溫度()測得溫度()ABCDOEFGH16059.07959.87959.47759.19559.30259.97459.89360.04360.00826060.00060.54660.20460.01760.05860.07860.00560.07860.04636060.82861.28161.06660.85460.96760.00359.96460.06160.08246061.00261.43561.13260.98961.03160.13260.02760.15960.11256061.21261.41861.31861.20961.24459.98459.89260.09860.03066060.90161.06661.04361.02961.04860.16560.20360.28860.16776060.72060.87560.89760.86760.88760.00759.94960.09960.10586060.52460.61260.62760.66060.64060.04059.95460.12260.13596060.28360.37960.40460.39360.40560.02259.94860.11860.097106060.10460.19160.28760.26660.25359.80959.68459.91059.908116059.93259.96860.03260.01560.02759.82059.73559.92359.932126060.23160.21260.32060.26560.29060.05259.81560.08360.069136059.96560.02160.07660.09960.07760.09859.91060.16360.146146060.02460.18960.13360.10060.10360.09060.08860.23060.160156059.99959.97160.07260.05860.07260.04759.86860.15460.137166060.08560.00760.13960.01060.01159.96059.78960.22460.231溫度上偏差:1.435溫度下偏差:-0.921溫度均勻度:0.710溫度波動度:1.0661.3.2雙列八孔水浴表4雙列八孔水浴40試驗數(shù)據(jù)雙列八孔水浴 設(shè)定40測量 次數(shù)顯示溫度()測得溫度()ABCDOEFGH140.040.11340.03140.27440.25340.11840.26440.07740.16040.143240.040.14740.07840.30240.27840.14040.30839.98540.18240.133340.040.16940.06640.29240.28340.15940.30840.03140.18240.141440.040.18340.05140.29740.28340.15440.29040.03240.19040.153540.040.19040.04540.30840.28940.14440.29640.03240.17140.157640.040.18140.04140.30940.29440.15840.31740.05740.17740.154740.040.17540.07240.31440.29540.15540.31640.03840.19440.145840.040.19440.06940.30340.31040.15840.31340.03340.19940.166940.040.18240.07040.31440.29640.15240.31840.06740.19340.1631040.040.19840.08240.31040.29640.14440.33840.10840.19940.1681140.040.19540.09740.34340.31240.15840.31840.08540.18240.1861240.040.20240.10840.34340.32040.16940.32740.06640.20740.1681340.040.21940.10940.33740.30840.17840.32240.13040.20140.1781440.040.21840.11140.33840.32040.16340.33840.15140.20240.1861540.040.21540.12740.35540.31740.18940.34640.14040.22240.1841640.040.25740.05340.30440.32340.22640.28640.07040.23940.162溫度上偏差:0.355溫度下偏差:-0.015溫度均勻度:0.263溫度波動度:0.0831.3.3 恒溫水槽表5恒溫水槽50試驗數(shù)據(jù)恒溫水槽 設(shè)定50測量 次數(shù)顯示溫度()測得溫度()ABCDOEFGH150.048.94148.92148.93148.92348.92948.92648.92748.93548.926250.048.92148.93548.92448.92848.93748.93848.92948.94048.936350.048.92048.93348.92548.92148.93748.93748.92448.93648.939450.048.92048.93548.92948.92648.92448.93948.93348.93848.929550.048.93748.93348.93348.93048.92948.92648.92748.93248.935650.048.93648.93048.93748.92848.93948.92348.93048.93148.932750.048.93748.92948.93148.92148.94048.93548.92948.92848.938850.048.92348.92448.94048.92648.92448.92148.92748.93148.938950.048.94148.92848.92248.94348.92748.92048.92948.93948.9451050.048.93148.92348.92448.92448.92248.94048.93548.92848.9321150.048.93548.92948.93848.94048.93248.93748.92648.92348.9241250.048.92348.94048.93248.93448.92548.92848.92648.92848.9261350.048.93348.92348.94048.92948.93348.93948.93748.92648.9331450.048.93648.92148.92248.92148.92148.92748.92948.93648.9231550.048.92748.93048.92348.93548.93848.93548.92148.93548.9321650.048.90448.93148.88648.99848.85748.84148.99748.95348.971溫度上偏差:-1.002溫度下偏差:-1.159溫度均勻度:0.026溫度波動度:0.0111.3.4 精密恒溫水槽表6精密恒溫水槽36試驗數(shù)據(jù)精密恒溫水槽 設(shè)定36測量 次數(shù)顯示溫度()測得溫度()ABCDOEFGH136.036.21736.26236.27436.20336.21336.21636.21936.20436.265236.036.20836.19036.19136.21136.21436.29336.20436.28136.287336.036.28836.26536.27236.21336.21236.26236.20236.25536.271436.036.27836.27936.21336.22036.22036.20636.21336.28836.272536.036.29136.25436.27036.21836.21036.27436.21236.29336.298636.036.25336.28836.22236.22436.21736.26436.21836.20136.256736.036.26736.28736.29636.21836.21736.27636.20836.27136.213836.036.26736.19236.20736.21736.21636.20736.21636.29936.210936.036.27536.29236.23636.21936.21736.27036.20536.26736.2771036.036.26636.20436.20336.21936.20836.19036.21736.20436.2081136.036.27336.26336.20536.20636.20536.23336.20736.26036.2881236.036.21636.28336.26436.20236.22936.22236.20636.27836.2081336.036.26036.28336.29336.20636.21536.21936.20536.27536.2341436.036.20136.27836.25836.21836.22036.29836.22036.29736.2961536.036.19436.26636.20736.21936.21636.25936.21136.22036.2701636.036.21736.18936.12636.23936.28036.24536.20636.23336.192溫度上偏差:0.299溫度下偏差:0.126溫度均勻度:0.091溫度波動度:0.0541.3.5數(shù)顯低溫恒溫溢流水槽表7數(shù)顯低溫恒溫溢流水槽25試驗數(shù)據(jù)數(shù)顯低溫恒溫溢流水槽 設(shè)定25測量 次數(shù)顯示溫度()測得溫度()ABCDOEFGH125.025.12225.37525.34725.25225.08925.32425.23825.06725.176225.025.20125.41025.37425.28725.11525.34225.26425.09725.191325.025.32425.42125.41025.28625.13425.38825.27725.11925.208425.025.23925.32925.15225.28225.37725.41825.28725.13725.228525.025.25225.34225.15025.30425.40825.15625.27925.38925.232625.025.34325.14025.29625.41725.25025.14325.30425.41525.268725.025.43425.13825.32825.42625.28125.14125.31325.43325.276825.025.40725.12225.34125.41325.30025.13725.35525.40625.296925.025.43825.11525.38825.42125.29925.11925.38225.43525.2961025.025.40425.25025.41825.44825.31425.26725.41725.45225.3271125.025.14825.27025.38125.23025.32325.27925.43725.12925.3491225.025.15625.30825.40025.25825.35425.29925.40125.13225.3761325.025.28025.38425.13925.32025.43025.29225.43925.15825.4041425.025.45725.41525.12525.35125.30125.31225.44725.17325.4281525.025.46025.24325.18425.10725.16125.43825.45525.19325.4481625.025.48125.25225.11825.17725.15025.50825.53525.18925.449溫度上偏差:0.535溫度下偏差:0.067溫度均勻度:0.302溫度波動度:0.1921.3.6 恒溫油浴表8 恒溫油浴300試驗數(shù)據(jù)恒溫油浴 設(shè)定300測量 次數(shù)顯示溫度()測得溫度()ABCDOEFGH1300.0298.610298.758298.821298.809298.875298.783298.883298.829298.8742300.0298.695298.780298.982298.757298.859298.776298.736298.816298.8363300.0298.801298.552298.866298.980298.677298.870299.082298.993298.9364300.0298.712298.661298.998298.903299.028298.705299.076298.883298.7885300.0298.773298.908298.728298.917298.680298.875298.684298.829298.9196300.0298.587298.949298.647298.894298.780298.681298.877298.721298.8327300.0298.497298.822298.841298.595298.676298.886298.894298.937298.7198300.0298.785298.720298.781298.742299.027298.717298.852298.971298.8159300.0298.712298.738298.797298.775299.011298.621298.877299.005299.00910300.0298.681298.794299.025298.653298.926298.711298.908298.720299.04911300.0298.650298.599298.904298.729298.969298.665298.841299.008298.94712300.0298.512298.602298.632298.621298.823298.671299.088298.763298.92313300.0298.729298.844298.977298.851298.687298.850298.821298.684298.99614300.0298.672298.883298.901298.668299.061298.963299.056298.947298.80115300.0298.590298.940298.888298.781298.976298.831298.848298.785298.72816300.0298.577298.896298.944298.726299.055298.899298.818298.730298.734溫度上偏差:-0.912溫度下偏差:-1.503溫度均勻度:0.387溫度波動度:0.2021.3.7 超級低溫槽表9 超級低溫槽-80試驗數(shù)據(jù)超級低溫槽 設(shè)定-80測量 次數(shù)顯示溫度()測得溫度()ABCDOEFGH1-80-79.679-79.725-79.593-79.679-79.745-79.796-79.632-79.604-79.7122-80-79.606-79.753-79.492-79.719-79.668-79.731-79.585-79.582-79.6443-80-79.768-79.779-79.678-79.757-79.831-79.863-79.717-79.593-79.7604-80-79.584-79.673-79.520-79.767-79.730-79.724-79.721-79.678-79.6485-80-79.667-79.779-79.618-79.779-79.816-79.729-79.635-79.581-79.7436-80-79.687-79.726-79.696-79.695-79.671-79.771-79.680-79.556-79.6537-80-79.718-79.739-79.566-79.733-79.716-79.854-79.672-79.653-79.6888-80-79.635-79.658-79.552-79.669-79.667-79.794-79.539-79.530-79.6939-80-79.673-79.808-79.544-79.757-79.741-79.755-79.551-79.565-79.68610-80-79.625-79.680-79.649-79.688-79.705-79.703-79.666-79.554-79.63911-80-79.688-79.769-79.607-79.663-79.747-79.801-79.544-79.556-79.71012-80-79.661-79.795-79.650-79.710-79.794-79.849-79.568-79.627-79.74713-80-79.760-79.724-79.700-79.664-79.837-79.803-79.568-79.576-79.76014-80-79.641-79.788-79.607-79.734-79.651-79.853-79.558-79.606-79.65315-80-79.679-79.655-79.566-79.597-79.791-79.899-79.632-79.574-79.74916-80-79.713-79.732-79.493-79.584-79.747-79.839-79.555-79.557-79.780溫度上偏差:0.508溫度下偏差:0.101溫度均勻度:0.261溫度波動度:0.1041.3.8 粘度計恒溫槽表9 粘度計恒溫槽20試驗數(shù)據(jù)粘度計恒溫槽 設(shè)定25測量 次數(shù)顯示溫度()測得溫度()ABCDOEFGH12019.77219.71219.82719.85319.73419.77119.73019.74319.74822019.78119.72019.83319.86019.74119.77719.73519.74819.75732019.78119.72019.83319.86119.74119.77819.73619.74819.75542019.78119.72019.83319.86019.74119.78019.73619.74819.75752019.78219.72119.83419.86319.74319.78619.73719.74819.76062019.78219.72019.83319.86019.74219.78219.73519.74719.76072019.77919.71919.83219.86319.73919.78219.73519.74619.75682019.78219.72119.83419.86219.74219.78419.73719.74819.75992019.77819.71719.82819.85919.73819.77919.73119.74219.753102019.77519.71419.82819.85519.73719.77219.73019.74219.749112019.77519.71519.82719.85719.73719.77519.73119.74319.752122019.77619.71119.82319.85319.73319.77619.72719.73719.748132019.76919.70519.81619.84619.72619.76919.72019.73119.743142019.76219.70019.81319.84319.72119.76019.71519.72719.739152019.76119.69919.81219.84119.72019.75719.71419.72719.7361625.019.75719.69719.81019.84119.71819.75519.71319.72319.733溫度上偏差:-0.137溫度下偏差:-0.303溫度均勻度:0.142溫度波動度:0.0152.穩(wěn)定時間試驗液體恒溫試驗設(shè)備實際校準(zhǔn)工作中大多數(shù)需要在現(xiàn)場進(jìn)行,由于現(xiàn)場試驗條件及設(shè)備種類也各種各樣,為提高校準(zhǔn)效率、科學(xué)合理的反應(yīng)被校設(shè)備的有關(guān)性能,規(guī)范對于校準(zhǔn)過程中設(shè)備穩(wěn)定時間進(jìn)行了說明。溫度穩(wěn)定時間一般以說明書為依據(jù),說明書中沒有給出的,按以下原則執(zhí)行:溫度達(dá)到設(shè)定值,30min后可以開始記錄數(shù)據(jù)。如果在規(guī)定的穩(wěn)定時間之前能夠確定箱內(nèi)溫度已經(jīng)達(dá)到平衡,也可以提前記錄。升溫試驗:水浴鍋及恒溫水槽從室溫升到50,再從50升到95;油浴鍋及恒溫油槽從室溫升到200,再從200升到300;降溫試驗:低溫槽從室溫降至-40,再從-40降至-80。將穩(wěn)定時間填入下表:表10 穩(wěn)定時間試驗單位:min試驗設(shè)備名稱水浴鍋恒溫水槽升溫試驗室溫升至5012550升至95167試驗設(shè)備名稱油浴鍋恒溫油槽升溫試驗室溫升至2002310200升至3002413試驗設(shè)備名稱低溫槽降溫試驗室溫降至-4015-40降至-80153采樣間隔試驗液體恒溫試驗設(shè)備實際校準(zhǔn)工作中為提高校準(zhǔn)效率,準(zhǔn)確可靠地測量被校設(shè)備地溫度性能,規(guī)范對于校準(zhǔn)過程中溫度測量標(biāo)準(zhǔn)地采樣間隔進(jìn)行了說明。 采樣間隔試驗,按照每30s采樣1次、每1min采樣一次、每2min采樣一次,每個采樣間隔都記錄16組數(shù)據(jù),將試驗數(shù)據(jù)按1.2中規(guī)定計算后將得到的結(jié)果填入下表。表11 采樣間隔試驗試驗設(shè)備名稱恒溫水浴鍋精密恒溫水槽每30s采樣1次溫度上偏差:1.142溫度下偏差:-0.230溫度均勻度:0.303溫度波動度:0.850溫度上偏差:-0.137溫度下偏差:-0.302溫度均勻度:0.142溫度波動度:0.014每1min采樣一次溫度上偏差:1.230溫度下偏差:-0.255溫度均勻度:0.310溫度波動度:1.127溫度上偏差:-0.140溫度下偏差:-0.315溫度均勻度:0.141溫度波動度:0.016每2min采樣一次溫度上偏差:1.215溫度下偏差:-0.246溫度均勻度:0.306溫度波動度:1.142溫度上偏差:-0.134溫度下偏差:-0.316溫度均勻度:0.142溫度波動度:0.0334.工作空間上表面距液面距離試驗當(dāng)液體恒溫設(shè)備設(shè)定溫度與環(huán)境溫度差別較大時,工作空間上表面距液面距離若太小,工作空間內(nèi)溫度數(shù)值會受到環(huán)境溫度的影響。距離試驗:把液體恒溫實驗設(shè)備設(shè)定溫度分別設(shè)定在與環(huán)境溫度差別較大的情況下,待設(shè)備溫度穩(wěn)定后,從液面開始每10mm深度布置一個溫度探頭,共布置5個,按每2min采樣1次,記錄30min的數(shù)據(jù),取平均值填入下表。試驗設(shè)備名稱低溫槽環(huán)境溫度:23設(shè)定溫度:-10精密恒溫水槽環(huán)境溫度:24設(shè)定溫度:8010mm深度-9.60479.37520mm深度-10.03779.84430mm深度-10.24080.04740mm深度-10.21780.06250mm深度-10.22880.071五、試驗結(jié)論1. 液體恒溫試驗設(shè)備溫度參數(shù)試驗通過對不同種類的液體恒溫試驗設(shè)備溫度參數(shù)在不同溫度點按照規(guī)范要求進(jìn)行了試驗,采用多通道溫度巡檢儀等作為標(biāo)準(zhǔn)器進(jìn)行了試驗,并按照規(guī)范的數(shù)據(jù)處理要求給出了每個溫度試驗點的結(jié)果,包括溫度上偏差、溫度下偏差、溫度均勻度、溫度波動度的實測結(jié)果。2. 穩(wěn)定時間試驗對液體恒溫試驗設(shè)備達(dá)到設(shè)定值后到可以進(jìn)行校準(zhǔn)的穩(wěn)定時間進(jìn)行了試驗,試驗結(jié)果表明規(guī)范給出的說明性建議是合理可行的。3. 采樣間隔試驗 對溫度標(biāo)準(zhǔn)的采樣間隔進(jìn)行了試驗,發(fā)現(xiàn)溫度波動度的結(jié)果受采樣間隔的影響較大,經(jīng)過考慮選擇2min采樣1次,持續(xù)30min的采樣方式。4.工作空間上表面距液面距離試驗 試驗表面工作空間上表面距液面距離超過30mm時,工作空間內(nèi)溫度數(shù)值受環(huán)境溫度影響可忽略,規(guī)范給出的30mm規(guī)定是合理的。根據(jù)試驗結(jié)果分析,采用多通道溫度巡檢儀對液體恒溫試驗設(shè)備按照修訂規(guī)范的校準(zhǔn)要求進(jìn)行實際試驗,測量結(jié)果和數(shù)據(jù)處理符合要求,采用本規(guī)范制定的校準(zhǔn)方法是可行的。根據(jù)試驗結(jié)果分析,采用由多支A級鉑電阻及配套電測設(shè)備組成的溫度測量系統(tǒng)對以上液體恒溫試驗設(shè)備進(jìn)行試驗, 本規(guī)范制定的方法可以滿足實際校準(zhǔn)的需求。15- 1.請仔細(xì)閱讀文檔,確保文檔完整性,對于不預(yù)覽、不比對內(nèi)容而直接下載帶來的問題本站不予受理。
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