JJG38(皖)-2012温度传感器检定规程

JJG（皖）38-2012PAGE安徽省地方计量检定规程JJG（皖）38-2012矿用温度传感器Coalminetemperaturetransducer2012-10-10发布2013-01-01实施安徽省质量技术监督局发布JJG(皖)38-2012JJG(皖)38-2012Coalminetemperaturetransducer本规程经安徽省质量技术监督局于2012年10归口单位：安徽省质量技术监督局起草单位：安徽省淮南市计量测试研究所本规程由安徽省淮南市计量测试研究所负责解释本规程主要起草人：王晓明(安徽省淮南市计量测试研究所)参加起草人：邓民(安徽省淮南市计量测试研究所)贾永康(安徽省淮南市计量测试研究所)罗旭(安徽省淮南市计量测试研究所)目录范围······················································································································（5）2.概述··························································································································（5）3.计量性能要求········································································································（5）4.通用技术要求·········································································································（6）5.计量器具控制···········································································································（6）6.检定项目·····················································································································（7）7.检定方法·······················································································································（7）8.外观及通电检查···········································································································（7）9．基本误差及重复性···································································································（8）10.回程误差···················································································································（8）10．响应时间···················································································································（8）11.负载特性····················································································································（8）12.报警误差及声级强度·······························································································（9）13.绝缘电阻·················································································································（9）14.检定结果的处理和检定周期·················································································（10）15、矿用温度传感器检定记录·······················································································（11）JJG（皖）38-2012PAGE9

矿用温度传感器检定规程1范围℃,具有数字显示传感器首次检定、后续检定和使用中检验。2概述煤矿用温度传感器系采用半导体元件、热敏电阻或铂电阻等感温元件生产的数显温度测量仪器，主要用于煤矿井下温度监测，可对煤矿井下的环境温度、大型设备轴温、密闭内气温等进行连续检测、显示和数据传输。原理图如下：感温元器件感温元器件矿用温度传感器显示器输出频率、电流或数字信号3计量性能要求3.1矿用温度传感器的基本误差：≤±2.5%(F.S)；

3.2矿用温度传感器的重复性应不大于基本误差绝对值的1/2；3.3矿用温度传感器的回程误差应不大于基本误差绝对值的1/2；3.4传感器采用数字显示,其分辨率应不低于0.1℃,并能表示显示值的正或负；3.5响应时间:传感器的响应时间应不大于10s(水中)；3.6负载特性:输出频率、电流信号的仪器，外接负载电阻在（0～500）Ω范围内变化时，其对应示值的变化应不超过基本误差；3.7具有报警功能的温度传感器应能在量程范围内任意设置报警点，报警显示值与设定值的差值应不超过基本误差的1/2。报警声级强度在距其1m远处的声响信号的声压级应不小于80dB(A)；3.7绝缘电阻：传感器本安端与外壳之间,其绝缘电阻应不小于50MΩ。4通用技术要求4.1传感器应标明生产厂家、型号、出厂日期、编号及防爆标志:ExibI；4.2传感器显示窗应透光良好,数码,符号均应清晰,完好。传感器亮数码显示在黑暗处显示数值清晰可见

；4.3传感器采用数字显示的,其分辨率应不低于0.1℃,并能表示显示值的正或负；4.4传感器金属外壳表面应无明显划痕;金属部件不应有锈蚀和变形等缺陷；4.5传感器外壳接插件采用航空接插头座,应安装牢固,无松动现象；4.6.电路连接部分的极性应正确，接触应良好；机械连接部分应牢固可靠；活动部分应转动自如。5计量器具控制计量器具控制包括：检定和使用中检验。5.1检定条件5.1.1检定温度和湿度

（20±5）℃；相对湿度（45～60）％；5.1.25.1.3无露水、霜冻、雨水、阳光直射5.2检定设备5.2.1水槽：（室温~100）℃温场均匀性≤0.05℃波动性≤0.05℃/10min油槽：（0~300）℃温场均匀性≤0.05℃波动性≤0.05℃/10min；或准确度等级不低于恒温槽的其它恒温设备；5.2.2标准水银温度计(0~200)℃或准确度等级不低于标准水银温度计的其它标准器5.2.3兆欧表：(0~500)V，10级5.2.4检定传感器时，由标准器、辅助设备及环境条件等所引起的检定不确定度应不超过被检传感器允许基本误差的1／5.2.5频率计,量程:0～10kHz,稳定度≤10-45.2.6标准电流表,量程:0～30mA,精度等级不低于0.5级；5.2.7标准电压表,量程:0～30VDC,准确度等级不低于0.5级；5.2.85.2.9直流稳压电源,稳定度5.2.8电阻箱：（0～1000）Ω5.2.9秒表：分度值为0.05.2.10声级计：6检定项目6.1检定项目一览表序号检定类别检定项目首次检定后续检定使用中检定1外观及通电检查+++2示值误差及重复性+++3回程误差++-4响应时间++-5负载特性++-6报警误差及声级强度++-7绝缘电阻++-注：1.“+”为需检定项目，“-”为不需检项目。2.仪器经拆装、维修或更换主要元件后，对计量性能有较大影响的，其后续检定按首次检定进行；3.无报警功能的，第6项不检。

7、检定方法7.1外观及通电检查7.1.1仪表在检定环境条件下，放置不少于1h，并按产品说明书规定进行开机预热,预热时间不少于20min7.1.2外观检查：用目测和触摸的方法检查，应符合本规程3.17.2基本误差及重复性检定7.2.1传感器进人正常工作状态后,根据传感器使传感器输出端处于正常工作状态；7.2.2被检传感器感温元件浸入恒温槽(或温场)内，等恒温槽(或温场)温度稳定后,分别用标准温度计或高精度温度检测装置测量恒温槽(或温场)温度。7.2.3检定点的选取:在量程范围内选取不少于五个点进行检定7.2.7.2.5首次检定，检定点应均匀分布在整个测量范围上（必须包括测量上、下限），不得少于五点。有7.2.6后续检定和使用中检验的矿用温度传感器，检定点应均匀分布在整个测量范围上（必须包括测量上、下限），不得少于四点。有7.2.7矿用温度传感器的检定时，在各测量点稳定3min,记录标准温度计示值,传感器的显示值和输出信号值(换算为温度值)。首先由传感器量程下限向量程上限方向升温，测量一次；然后由量程上限向量程下限方向降温，测量一次；以这样上、下行程的检定作为一次循环。重复进行一遍循环测量。将四次测量值,取其算术平均值与标准温度计示值之差的最大值与量程上限值之比,为示值误差。示值误差应符合本7.2.8ΔTJ=(TP-TB)/Tm式中：ΔTJ传感器的示值误差TP传感器测量平均值TB标准器修正后的示值Tm传感器量程上限值7.2.9矿用温度传感器重复性按下式计算，应符合本规程3.2ΔTc=max|TP-TB|/Tm式中：ΔTc传感器的重复性误差7.3回程误差的检定检定传感器的回程误差与基本误差同时进行,其结果应符合本规程3.3条的规定。回程误差可按下式计算。△H=∣SX-XX∣ 式中 △H为回程误差值； SX，XX为分别表示各检定点上、下行程的实际输出值的算术平均值。7.4、响应时间将传感器的温度敏感元件放入25℃的恒温水槽中(在测定过程中,温度敏感元件切勿与金属物件,容器壁及容器底面接触),显示稳定后,再稳定3min,记录传感器显示值,然后将温度敏感元放入5℃的水中,待显示稳定后,再稳定3min,迅速将温度敏感元放入25℃恒温水槽中,同时启动秒表,记录传感器的显示值达到原显示值的90%所需要的时间,重复测量3次,取其算术平均值。7.5、负载特性按仪器说明书要求，使传感器输出端处于正常工作状态下，按7.2步骤操作和计算；然后，将仪器输出端串接500Ω电阻，读取仪器在外接负载电阻为500Ω时的输出电信号值,按7.2步骤操作和计算。每点测量四次，取其算术平均值为仪器各点输出值。换算的接入外接电阻500Ω各测量点的温度值与仪器未接500Ω负载电阻时各测量点的温度值之间的误差（误差按下式计算），应符合本规程3.5条的规定。ΔTF=(T500-T0)/Tm式中：ΔTF传感器的负载误差T500传感器接500Ω电阻时温度平均值Tm传感器量程上限值T0传感器接未接500Ω电阻时温度平均值7.6报警误差及声级强度7.6按仪器说明书，将报警点设定在25℃，将传感器放入15℃以下恒温槽中，缓慢地对恒温槽升温,当传感器发出报警声时，读取报警器报警值。按下式计算报警误差。式中：—报警设定值；—报警平均值。7.6报警声级强度用声级计测量。声级计置于环境噪音不大于50dB，距仪器报警声响器轴心正前方0.5m处，测量三次，取其平均值为报警声级强度。7.7绝缘电阻用输出电压500V的兆欧表在电源输入端与机壳接地端、电源输入端与传感器一次元件之间等部位进行测量,待显示稳定时读取绝缘电阻数值，绝缘电阻测量值应不小于50MΩ。8、检定结果处理8.1经检定合格的温度传感器出具检定证书。检定证书中应给出传感器示值误差的检定结果。8.2检定不合格的温度传感器出具检定结果通知书，并注明不合格项目。8.3检定周期一般不超过1年。

附录A矿用温度传感器检定记录送检单位证书编号规格型号器具编号制造厂商精度等级量程分辩率环境温度℃相对湿度%一、外观及