比重瓶校验方法

比重瓶校验方法本规程适用于新购置及使用中的比重瓶。1．1概述比重瓶用于粒径小于5mm的土及其他粉状物料比重（密度）测定。1．2技术要求1．1．1外观：无裂纹或其他明显变形。1．1．2容积：经标定，绘制瓶水总质量与温度关系曲线。1．3校验用标准工具1．3.1天平：称量200g，感量0.001g。1．3.2温度计：刻度范围0~50℃，精确至0.5℃。1．4校验方法1．4.1外观：目测。1．4.2绘制瓶水总质量与温度关系曲线。将比重瓶洗净、烘干。冷却称重，准确至0.001g，反复恒重至两次差值不大于0.002g时取平均值。将事先煮沸并冷至室温的纯水注入比重瓶，擦干外表水滴，称其水瓶总重量。1．4.3按公式PW2PW2PW1m2=m0+（m1–m0）[1+ωv（T2–T1）]计算m2，式中：T1——比重瓶内纯水温度℃T2——比重瓶内纯水任意温度℃m1——温度为T1时的瓶水总质量gm2——温度为T2时的瓶水总质量gm0——比重瓶的质量gPw1——温度为T1时水的密度g/cm3（查附表）Pw2——温度为T2时水的密度g/cm3（查附表）ωv——玻璃的胀缩系数，国产瓶可取1．4×10-5/℃将计算结果列表，以温度为纵座标，瓶水总质量为横座标，绘制曲线。1．5校验结果处理1．5.1外观检查合格。1．5.2绘制出瓶、水总质量与温度曲线。1．8.6校验周期、记录校验周期为一年。校验记录见设备档案。注：本方法摘自铁道部《铁路工程试验专用仪器校验方法》。比重瓶校验记录仪器编号校验号1．计算校正法记录瓶号：T1=Pw1=m0=m1=T2m21．瓶水总质量与温度关系曲线3．外观检查校验结论：校验员核验员校验日期年月日温度(℃)0.00.10.20.30.40.50.60.70.80.95678910110.99999199681929587628088727763280.99999029649924887018013718962250.99998839616920986387936709961210.99998649581915085747859700860170.99998429544909986097780691559110.99998199506904684427699682058030.9997959167899283747617672456940.99997699426893683057534662755850.99997419384887982347450652954730.99997129340882181627364642853611213141516171819202152474040271212650.99897018022623243312323021051323913257211130.99895387848606441352117*977350163784243209610.99893747673586739381909*977548983655229008080.99892097497567337401701*955647803524214706530.99890437319548535411490*933546603391200304970.99888767141529533411280*911415383258185803400.99887076961516531401068*889244153123171101820.98885386781491329370855*866949212987156400230.99883676599472027330641*8444416628501415*98620.99881956416432625290426*8219222324252627282930313233343536373839400.99779935674325607390.9968128542126230.99597356756369205420.9947308399105940.993711935650.9929936623224550.99777655437300904820.9967861514623380.99594406454338002220.9946980365502510.993676732060.992956858570.99775375198276002250.9967594486920520.995914661513068*99010.99466513319*99060.993641428460.992920154820.997730849592511*99660.9967326459117660.995885058462755*95800.99463212981*95600.993606124840.992883351060.997707747182261*97060.9967057431314780.995855455412442*92580.99459912643*92140.993570721230.992846347300.997684644772010*94450.9966786403311900.995825752352127*89350.99456602303*88670.993535117600.992809343520.997661344351758*91840.9966515375309010.995795849281812*86120.99453281963*85180.333499613970.992772239740.997638039911505*89210.9966243347206100.995765946201495*82860.99449951622*81700.993463910320.992735135950.997614537171250*86570.9965970379003190.995735913121178*79610.99446611280*78200