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3051压力变送器的常见故障及排除3051压力变送器广泛应用于各种工业自控环境，涉及水利水电、铁路交通、智能建筑、生产自控、航空航天、军工、石化、油井、电力、船舶、机床、管道等众多行业，下面就简单介绍一些常用变送器的常见故障及排除方法。
压力变送器的常见故障及排除1)压力上去，变送器输出上不去加压变送器输出不变化，再加压变送器输出突然变化，泄压变送器零位回不去。
这种情况应检查压力接口是否漏气或者被堵住，在检查接线方式和电源，如果正常再察看传感器零位是否有输出，或者进行简单加压看输出是否变化，有变化证明传感器没有损坏，如果无变化传感器即已经损坏。
最后在考虑还可能是仪表损坏，或者整个系统的其他环节的问题。
2)3051压力变送器输出信号不稳出现这种情况应考虑A.压力源本身是一个不稳定的压力B.仪表或压力传感器抗干扰能力不强C.传感器接线不牢D.传感器本身振动很厉害E.传感器故障3)加压变送器输出不变化，再加压变送器输出突然变化，泄压变送器零位回不去,检查传感器器密封圈，一般是因为密封圈规格原因(太软或太厚)，传感器拧紧时，密封圈被压缩到传感器引压口里面堵塞传感器，加压时压力介质进不去，但是压力很大时突然冲开密封圈，压力传感器受到压力而变化，而压力再次降低时，密封圈又回位堵住引压口，残存的压力释放不出，因此传感器零位又下不来。
排除此原因方法是将传感器卸下看零位是否正常，如果正常更换密封圈再试。
4)3051压力变送器接电无输出a)接错线(仪表和传感器都要检查)b)导线本身的断路或短路c)电源无输出或电源不匹配d)仪表损坏或仪表不匹配e)传感器损坏5)3051压力变送器的误差确认正常误差范围的方法：计算出压力表的误差值例如：压力表量程为30bar，精度1.5%，最小刻度为0.2bar 正常的误差为：30bar*1.5%+ 0.2*0.5(视觉误差)=0. 55bar 压力变送器的误差值。
总体来说对3051压力变送器在使用过程中出现的一些故障分析和处理主要由以下几种方法。
罗斯蒙特3051型智能压力变送器检修规程(DOC)1. 简介罗斯蒙特3051型智能压力变送器是一种用来检测流体压力的设备，广泛应用于石油化工、机械、电力、冶金等行业的自动化控制系统中。
本文档主要介绍罗斯蒙特3051型智能压力变送器的基本构造、检修前的准备工作、检查过程和注意事项。
2. 基本构造罗斯蒙特3051型智能压力变送器由传感器、附件和电路板组成，传感器用来检测流体压力变化，附件用来连接传感器和控制系统，电路板用来处理传感器采集到的信号，并向控制系统输出压力值。
传感器部分采用先进的层压半导体技术，以满足各种应用环境的要求，包括高温、高压、低温、低压等状态。
附件包括法兰、接头、导管等，有多种不同材质和规格可供选择，以适应不同的管道尺寸和流体类型。
电路板具有高精度、高可靠性和自动校准等特点，同时还具有HART通信协议，可将测量值传输至上位机或PLC 等设备。
3. 检修前的准备工作在进行检修前，必须先对检修区域进行安全检查，确保没有任何潜在的危险因素。
同时，需要准备好下列工具和设备：•液压或气动泵•夹具和扳手•螺丝刀和电工钳•清洁剂和布•相关技术资料和说明书4. 检查过程4.1 断电和拆除在进行检查之前，必须先断开设备的电源或气源，并拆卸与控制系统的连接。
4.2 清洗和检查使用清洁剂和布对传感器、附件和电路板进行彻底的清洗，以确保无灰尘、油脂和其他污物等。
接着，检查传感器是否有氧化或腐蚀现象，并检查附件和电路板是否有裂纹、变形或其他损坏。
4.3 维护和更换根据需要，对传感器部分进行涂油或更换密封圈等维护工作。
如果发现任何损坏或故障，应及时更换对应部件。
4.4 装配和连接在进行装配和连接之前，必须先进行必要的校准和检测。
在安装传感器时，应注意对其进行正确的定位和定量。
5. 注意事项在进行检查和维护过程中，务必遵守以下注意事项：•确保控制系统处于关闭状态•使用正确的工具和设备•保持检修区域的清洁和干燥•避免用过硬的物体碰撞和刮伤设备表面•严格遵守相关规程和安全操作规范，罗斯蒙特3051型智能压力变送器是一种高精度、高可靠的流体压力检测设备。
一、现场3051压力变送器故障排除步骤
1、根据控制室趋势图进行分析故障原因，工艺误判断（一般趋势指示一边压力示值程缓慢变化趋势，或根据工况有规律变化，）仪表问题，（一般趋势图不程缓慢变化，变化幅度非常剧烈）
2、参照变送器指示压力和现场就地指示压力表显示压力值，并确认测量管道是够有余压。
3、根据现场变送器指示，如上次处理故障为超量程，首先对其进行断电，而后在送电进行观察，如果故障显示仍然为超量程，那么测量一下电流值是否对应其指示压力值，
4、根据上文故障处理步骤，对故障进行范围性缩小排除，
5、确认测量管道内无压力情况下，打开调零螺丝，对其进行一次到两次机械零点调整，故障仍然显示为超量程，那么就要考虑是否存在蹩压现场，
6、缓慢旋转测量管螺栓，以免被蹩压溅射测量介质，拆卸后对其在进行机械零点调整，最终确认故障为仪表本事故障，（1、变送器3大模块有故障2、变送器感压膜片变形）
7、更换30513模块后故障仍为超量程，那么最后判定变送器感压膜片变形或者损坏。
结合上一故障处理步骤，你要理解故障处理大致思路为，预判断--逐步排查缩小判定故障点--确认故障位置。
3051压力变送器的检修压力和差压是工业生产过程中常见的过程参数之一。
在许多场合需要直接检测、控制的压力参数，如锅炉的气包压力、炉膛压力、烟道压力；化学生产中的反应斧压力、加热炉压力等。
此外，还有一些不易直接测量的参数，如液位、流量等参数往往需要通过压力或差压的检测来间接获取。
因此，压力和差压的测量在各类工业生产领域中如石油、电力、化工、冶金、航天航空、环保、轻工等占有很重要的地位。
第一节变送器基础知识变送器在自动检测和控制系统中的作用，是将各种工艺参数，如温度、压力、流量、液位、成分等物理量转换成统一的标准信号，以供显示、记录或控制之用。
分类──按被测参数差压变送器压力变送器温度变送器液位变送器流量变送器等变送器的理想输入输出特性一、变送器的构成原理模拟式变送器的构成原理数字式变送器的构成原理（1）模拟式变送器的构成原理模拟式变送器的组成：测量部分，放大器，反馈部分，零点调整和零点迁移模拟式变送器的输入输出关系当满足>>1的条件时模拟式变送器的理想输入输出特性（2）数字式变送器的构成原理：数字式变送器组成:二大部分硬件电路──以微处理器CPU为核心软件──包括系统程序和功能模块a.数字式变送器的硬件构成智能式变送器还配置有手持终端(外部数据设定器或组态器)，用于对变送器参数进行设定，如设定变送器的型号、量程调整、零点调整、输入信号选择、输出信号选择、工程单位选择和阻尼时间常数设定以及自诊断等。
b.数字式变送器的软件构成──包括系统程序和功能模块系统程序:对变送器硬件的各部分电路进行管理，并使变送器能完成最基本的功能，如模拟信号和数字信号的转换、数据通信、变送器自检等功能模块可能有：资源模块变量转换阻尼时间设定模拟输入显示转换量程自动切换运算功能非线性校正·PID 控制功能温度误差校正警报（3）罗斯蒙特3051压力变送器的工作原理3051系列差压变送器是由Fisher-Rosemount公司生产的一种高性能两线制变送器。
3051压力变送器校验步骤Calibration Steps for the 3051 Pressure Transmitter3051压力变送器校验步骤Without using common transitional words, I will outline the steps to calibrate a 3051 pressure transmitter. Please note that these steps may vary depending on the specific model you are working with. It is important to refer to the manufacturer's instructions and guidelines beforeattempting any calibration procedures.在不使用常见的过渡词语的情况下，我将概述3051压力变送器的校准步骤。
请注意，这些步骤可能因您所使用的具体型号而有所不同。
在尝试任何校准程序之前，请参考制造商的说明和指南。
Step 1: Gather Necessary Equipment第一步：收集必要的设备Before starting the calibration process, ensure that you have all the necessary equipment ready. This typically includes a power supply, a digital multimeter, a pressure reference device (such as a deadweight tester or pressurecalibrator), appropriate cables and connectors, and any required calibration software.在开始校准过程之前，请确保您已准备好所有必要的设备。
3051压力变送器的校验与故障诊断怎样使用375HC 对3051系列进行组态调校?3051C或其它压力变送器与375HART手操器的接线:现场可接在表的电源端子处,控制室可接在信号端子处. 回路电阻应保证在250Ω-----1000Ω的范围内.本小册子将分别介绍:1. 基本仪表组态或设定.仪表校验的方法及常见故障分析. 2.375手操器meters village between road hardening, 11 km of pass group Highway, livelihood project; ordered advance XX finished pupils canteen, and wangji alone finished small teaching floor, and wangji alone finished pupils canteen, and ancient Dang "culture tourism features village", and wangji alone village and Bula village River suspension, and Bula village la Los end of pass group Highway, and XX Meters village debris flow disaster control, building project; started has victims will LOS, wood child moving, and autumn baby, pass group highway construction project; solid do "a water two dirt" regulation, and wood added Jia village, XING side fumin, and XX meters village pass village Highway hardening, and ancient Dang village disaster Hou traffic reconstruction, and Bulavillage whole village advance, and day care center, major project of early work. Second, develop eco-agriculture construction of the Canyon. Economic development of eco-agricultural construction in an important position, accelerated "8321" works completed caoguo 23700 acres planted, bubble 4125 acres planted walnuts, sumac 4000 acres planted, Yun Huang Lian 6040 acres planted, tea-oil tree planting 8887.8 acres. Tocultivate new economic growth points, good farmers ' well-off society of the industrial base. Third, start a poverty alleviation project. Storming the headquarters was established, well-organized, well arranged, formation of 7 supporting task force launched the poverty file state cards work in a timely manner, the task force entered the village door communication policy, mobilization mass base, making poverty eradicationplan, and find out about poverty, assist in the implementation of projects1.基本仪表组态或设定.1. 打开电源开关. 等待375进入主菜单画面.2. 使用光标笔双击”HART 应用栏”! 如果手操器与变送器通讯正常,则画面应转入在线画面.此时,双击”仪表设置”即可进入变送器的组态菜单.仪表组态画面有5 个选项:1. 双击”显示过程变量”后, 您可以察看与变送器相关的所有测量参数. meters village between road hardening, 11 km of pass group Highway, livelihood project; ordered advance XX finished pupils canteen, and wangji alone finished small teaching floor, and wangji alone finished pupils canteen, and ancient Dang "culture tourism features village", and wangji alone village and Bula village River suspension, and Bula village la Los end of pass group Highway, and XX Meters village debris flow disaster control, building project; started has victims will LOS, wood child moving, and autumn baby, pass group highway construction project; solid do "a water two dirt" regulation, and wood added Jia village, XING side fumin, and XX meters village pass village Highway hardening, and ancient Dang village disaster Hou traffic reconstruction, and Bulavillage whole village advance, and day care center, major project of early work. Second, develop eco-agriculture construction of the Canyon. Economic development of eco-agricultural construction in an important position, accelerated "8321" works completed caoguo 23700 acres planted, bubble 4125 acres planted walnuts, sumac 4000 acres planted, Yun Huang Lian 6040 acres planted, tea-oil tree planting 8887.8 acres. Tocultivate new economic growth points, good farmers ' well-off society of the industrial base. Third, start a poverty alleviation project. Storming the headquarters was established, well-organized, well arranged, formation of 7 supporting task force launched the poverty file state cards work in a timely manner, the task force entered the village door communication policy, mobilization mass base, making poverty eradicationplan, and find out about poverty, assist in the implementation of projects2. 进入诊断画面,您可以对仪表进行各种校验及回路测试,另外仪表的各项报警也可以查看! 注意!对于3051S高性能变送器, 增加了第6 项:” LCD display config”以便进行现场显示器的组态.此组态可以允许您进行多个参数的循环显示.3. 进入”基本设置”您可以进行修改位号;工程单位;量程及仪表的阻尼系数;传递涵数.因此,这是最常用的菜单. 您可以双击5个选项的任一个进入该菜单!以下是菜单3:请注意: 单击左箭头可以退回上一级菜单, 单击”X” 图标退回主菜单(此时可以关机).meters village between road hardening, 11 km of pass group Highway, livelihood project; ordered advance XX finished pupils canteen, and wangji alone finished small teaching floor, and wangji alone finished pupils canteen, and ancient Dang "culture tourism features village", and wangji alone village and Bula village River suspension, and Bula village la Los end of pass group Highway, and XX Meters village debris flow disaster control, building project; started has victims will LOS, wood child moving, and autumn baby, pass group highway construction project; solid do "a water two dirt" regulation, and wood added Jia village, XING side fumin, and XX meters village pass village Highway hardening, and ancient Dang village disaster Hou traffic reconstruction, and Bula village whole village advance, and day care center, major project of early work. Second, develop eco-agriculture construction of the Canyon. Economic development of eco-agricultural construction in an important position, accelerated "8321" works completed caoguo 23700 acres planted,bubble 4125 acres planted walnuts, sumac 4000 acres planted, Yun Huang Lian 6040 acres planted, tea-oil tree planting 8887.8 acres. Tocultivate new economic growth points, good farmers ' well-off society of the industrial base. Third, start a poverty alleviation project. Storming the headquarters was established, well-organized, well arranged, formation of 7 supporting task force launched the poverty file state cards work in a timely manner, the task force entered the village door communication policy, mobilization mass base, making poverty eradication plan, and find out about poverty, assist in the implementation ofprojects单击”HOME”退回在线菜单(Online, 此菜单为实时参数更新画面)3-1: 修改单位:双击”单位”进入修改工程单位子菜单:使用光笔单击所选定的单位,然后单击”ENTER”,这时候会出现一个提示,告诉你当前过程变量在该选定单位尚未发送至变送器之前仍然为原单位,提示你应在下随菜单中进行发送(SEND).因此,见到提示后,即按OK 则出现下随菜单:此时单击”SEND”并在见到提示后,按OK,修该后的单位即下装到变送器中.meters village between road hardening, 11 km of pass group Highway, livelihood project; ordered advance XX finished pupils canteen, and wangji alone finished small teaching floor, and wangji alone finished pupils canteen, and ancient Dang "culture tourism features village", and wangji alone village and Bula village River suspension, and Bula village la Los end of pass group Highway, and XX Meters village debris flow disaster control, building project; started has victims will LOS, wood child moving, and autumn baby, pass group highway construction project; solid do "a water two dirt" regulation, and wood added Jia village, XING side fumin, and XX meters village pass village Highway hardening, and ancient Dang village disaster Hou traffic reconstruction, and Bula village whole village advance, and day care center, major project of early work. Second, develop eco-agriculture construction of the Canyon. Economic development of eco-agricultural construction in an important position, accelerated "8321" works completed caoguo 23700 acres planted, bubble 4125 acres planted walnuts, sumac 4000 acres planted, Yun HuangLian 6040 acres planted, tea-oil tree planting 8887.8 acres. Tocultivate new economic growth points, good farmers ' well-off society of the industrial base. Third, start a poverty alleviation project. Storming the headquarters was established, well-organized, well arranged, formation of 7 supporting task force launched the poverty file state cards work in a timely manner, the task force entered the village door communication policy, mobilization mass base, making poverty eradication plan, and find out about poverty, assist in the implementation ofprojects最后见提示单击OK 完成该操作.(注意,单位Unit左上角”*”在发送成功后,应消失!)如何对3051S 系列仪表进行自定义工程单位修改? 该新型仪表具有可自定义单位功能(Scaled Variable),并使其和模头压力值进行组态对应,同时进行切除及传递涵数的定义.此时的组态画面有所不同:需要进入4:DETAILED SETUP/详细设置菜单进行自定义单位的设置:选择3 /输出处理.然后选择4 /Scaled Variable/自定义变量设置,见下图:第6项功能是进行多变量的组态,您可以通过这一个组态将任一变量指定为4-20MA输出!meters village between road hardening, 11 km of pass group Highway, livelihood project; ordered advance XX finished pupils canteen, and wangji alone finished small teaching floor, and wangji alone finished pupils canteen, and ancient Dang "culture tourism features village", and wangji alone village and Bula village River suspension, and Bula villagela Los end of pass group Highway, and XX Meters village debris flow disaster control, building project; started has victims will LOS, wood child moving, and autumn baby, pass group highway construction project; solid do "a water two dirt" regulation, and wood added Jia village, XING side fumin, and XX meters village pass village Highway hardening, and ancient Dang village disaster Hou traffic reconstruction, and Bulavillage whole village advance, and day care center, major project of early work. Second, develop eco-agriculture construction of the Canyon. Economic development of eco-agricultural construction in an important position, accelerated "8321" works completed caoguo 23700 acres planted, bubble 4125 acres planted walnuts, sumac 4000 acres planted, Yun Huang Lian 6040 acres planted, tea-oil tree planting 8887.8 acres. Tocultivate new economic growth points, good farmers ' well-off society of the industrial base. Third, start a poverty alleviation project. Storming the headquarters was established, well-organized, well arranged, formation of 7 supporting task force launched the poverty file state cards work in a timely manner, the task force entered the village door communication policy, mobilization mass base, making poverty eradication plan, and find out about poverty, assist in the implementation ofprojects在Scaled Variable 下,选择7.可定义变量组态,进入该菜单后,利用引导提示和触屏键盘(类似于3051C的修改量程方法),你可以输入你所自定义的工程单位.同时可以组态该输出单位的范围及传递涵数(即线性或开方输出);切除值.为进一步确认组态的正确与否,可在上面的屏幕上进行检查,其中,进入1(可定义变量的压力对应值)可以看到模头差压与流量或液位的关系.meters village between road hardening, 11 km of pass group Highway, livelihood project; ordered advance XX finished pupils canteen, and wangji alone finished small teaching floor, and wangji alone finished pupils canteen, and ancient Dang "culture tourism features village", and wangji alone village and Bula village River suspension, and Bula village la Los end of pass group Highway, and XX Meters village debris flow disaster control, building project; started has victims will LOS, wood child moving, and autumn baby, pass group highway construction project; solid do "a water two dirt" regulation, and wood added Jia village, XING side fumin, and XX meters village pass village Highway hardening, and ancient Dang village disaster Hou traffic reconstruction, and Bulavillage whole village advance, and day care center, major project of early work. Second, develop eco-agriculture construction of the Canyon. Economic development of eco-agricultural construction in an important position, accelerated "8321" works completed caoguo 23700 acres planted, bubble 4125 acres planted walnuts, sumac 4000 acres planted, Yun Huang Lian 6040 acres planted, tea-oil tree planting 8887.8 acres. Tocultivate new economic growth points, good farmers ' well-off society of the industrial base. Third, start a poverty alleviation project. Storming the headquarters was established, well-organized, well arranged, formation of 7 supporting task force launched the poverty file state cards work in a timely manner, the task force entered the village door communication policy, mobilization mass base, making poverty eradicationplan, and find out about poverty, assist in the implementation of projects3-2: 修改量程:在基本设置中,用光标笔选中”3 量程”并双击,则进入量程修改菜单.在此菜单中,有两种修改方式.1. 直接键盘输入.这是最方便的方式.2. 提供标准压力值并将该压力确认为4 或20MA的设定点. 下面,为直接键盘输入方式:双击选项1.一般来说,如不做迁移,则只需修改量程上限.因此,双击”URV”进入键盘画面.meters village between road hardening, 11 km of pass group Highway, livelihood project; ordered advance XX finished pupils canteen, and wangji alone finished small teaching floor, and wangji alone finished pupils canteen, and ancient Dang "culture tourism features village", and wangji alone village and Bula village River suspension, and Bula village la Los end of pass group Highway, and XX Meters village debris flow disaster control, building project; started has victims will LOS, wood child moving, and autumn baby, pass group highway construction project; solid do "a water two dirt" regulation, and wood added Jia village, XING side fumin, and XX meters village pass village Highway hardening, and ancient Dang village disaster Hou traffic reconstruction, and Bulavillage whole village advance, and day care center, major project of early work. Second, develop eco-agriculture construction of the Canyon. Economic development of eco-agricultural construction in an important position, accelerated "8321" works completed caoguo 23700 acres planted, bubble 4125 acres planted walnuts, sumac 4000 acres planted, Yun Huang Lian 6040 acres planted, tea-oil tree planting 8887.8 acres. Tocultivate new economic growth points, good farmers ' well-off society of the industrial base. Third, start a poverty alleviation project. Storming the headquarters was established, well-organized, well arranged, formation of 7 supporting task force launched the poverty file state cards work in a timely manner, the task force entered the village door communication policy, mobilization mass base, making poverty eradicationplan, and find out about poverty, assist in the implementation of projects您可以使用光笔,点击数字键直接输入希望修改的量程.然后点击”ENTER”确认.当返回上一级菜单后,单击”SEND”进行发送!见下图.(URV左上角*号表示该参数尚未发送!)发送后,有两个提示,请单击OK 确认即可!请按左键返回基本设置菜单(BASIC SETUP)进行下一步!meters village between road hardening, 11 km of pass group Highway, livelihood project; ordered advance XX finished pupils canteen, and wangji alone finished small teaching floor, and wangji alone finished pupils canteen, and ancient Dang "culture tourism features village", and wangji alone village and Bula village River suspension, and Bula village la Los end of pass group Highway, and XX Meters village debris flow disaster control, building project; started has victims will LOS, wood child moving, and autumn baby, pass group highway construction project; solid do "a water two dirt" regulation, and wood added Jia village, XING side fumin, and XX meters village pass village Highway hardening, and ancient Dang village disaster Hou traffic reconstruction, and Bulavillage whole village advance, and day care center, major project of early work. Second, develop eco-agriculture construction of the Canyon. Economic development of eco-agricultural construction in an important position, accelerated "8321" works completed caoguo 23700 acres planted, bubble 4125 acres planted walnuts, sumac 4000 acres planted, Yun Huang Lian 6040 acres planted, tea-oil tree planting 8887.8 acres. Tocultivate new economic growth points, good farmers ' well-off society of the industrial base. Third, start a poverty alleviation project. Storming the headquarters was established, well-organized, well arranged, formation of 7 supporting task force launched the poverty file state cards work in a timely manner, the task force entered the village door communication policy, mobilization mass base, making poverty eradicationplan, and find out about poverty, assist in the implementation of projects3-3 :如何修改阻尼值?其方法和修改的量程方法一样. 此参数出厂设定为0.4秒!2-1.在基本设置中,选项2 是专门针对仪表的调校及故障诊断设置的.一般地说,变送器完成现场安装后,须进行读数的清零. 此功能在375 菜单中称之为:”ZERO RTIM”.以下为进入和完成该功能的步骤:由主菜单双击”仪表设置”即可进入上面的菜单.选中2 并双击,则进入诊断及服务子菜单. (见上图)meters village between road hardening, 11 km of pass group Highway, livelihood project; ordered advance XX finished pupils canteen, and wangji alone finished small teaching floor, and wangji alone finished pupils canteen, and ancient Dang "culture tourism features village", and wangji alone village and Bula village River suspension, and Bula village la Los end of pass group Highway, and XX Meters village debris flowdisaster control, building project; started has victims will LOS, wood child moving, and autumn baby, pass group highway construction project; solid do "a water two dirt" regulation, and wood added Jia village, XING side fumin, and XX meters village pass village Highway hardening, and ancient Dang village disaster Hou traffic reconstruction, and Bulavillage whole village advance, and day care center, major project of early work. Second, develop eco-agriculture construction of the Canyon. Economic development of eco-agricultural construction in an important position, accelerated "8321" works completed caoguo 23700 acres planted, bubble 4125 acres planted walnuts, sumac 4000 acres planted, Yun Huang Lian 6040 acres planted, tea-oil tree planting 8887.8 acres. Tocultivate new economic growth points, good farmers ' well-off society of the industrial base. Third, start a poverty alleviation project. Storming the headquarters was established, well-organized, well arranged, formation of 7 supporting task force launched the poverty file state cards work in a timely manner, the task force entered the village door communication policy, mobilization mass base, making poverty eradication plan, and find out about poverty, assist in the implementation ofprojects选中3 并双击,弹出下面的菜单.选中3 并双击,弹出下面的菜单:meters village between road hardening, 11 km of pass group Highway, livelihood project; ordered advance XX finished pupils canteen, and wangji alone finished small teaching floor, and wangji alone finished pupils canteen, and ancient Dang "culture tourism features village", and wangji alone village and Bula village River suspension, and Bula village la Los end of pass group Highway, and XX Meters village debris flow disaster control, building project; started has victims will LOS, wood child moving, and autumn baby, pass group highway construction project;solid do "a water two dirt" regulation, and wood added Jia village, XING side fumin, and XX meters village pass village Highway hardening, and ancient Dang village disaster Hou traffic reconstruction, and Bulavillage whole village advance, and day care center, major project of early work. Second, develop eco-agriculture construction of the Canyon. Economic development of eco-agricultural construction in an important position, accelerated "8321" works completed caoguo 23700 acres planted, bubble 4125 acres planted walnuts, sumac 4000 acres planted, Yun Huang Lian 6040 acres planted, tea-oil tree planting 8887.8 acres. Tocultivate new economic growth points, good farmers ' well-off society of the industrial base. Third, start a poverty alleviation project. Storming the headquarters was established, well-organized, well arranged, formation of 7 supporting task force launched the poverty file state cards work in a timely manner, the task force entered the village door communication policy, mobilization mass base, making poverty eradication plan, and find out about poverty, assist in the implementation ofprojects选择1 并双击.然后点击OK.对两个提示进行确认,注意, 此项校准应确认在控制系统处于手动状态下进行并变送器处于零差压/压力下进行,绝压表不能进行此项操作.接下来,375将提示仪表应确认处于零点压力状态!即应该在现场操作人员配合下进行压力平衡或放空操作. 确认完成上述工作后,点击OK. 见下图:接下来的提示, 告诉您仪表需确认零点读数的稳定, 然后,点击OK 结束操作.meters village between road hardening, 11 km of pass group Highway, livelihood project; ordered advance XX finished pupils canteen, and wangji alone finished small teaching floor, and wangji alone finished pupils canteen, and ancient Dang "culture tourism features village", and wangji alone village and Bula village River suspension, and Bula village la Los end of pass group Highway, and XX Meters village debris flow disaster control, building project; started has victims will LOS, wood child moving, and autumn baby, pass group highway construction project; solid do "a water two dirt" regulation, and wood added Jia village, XING side fumin, and XX meters village pass village Highway hardening, andancient Dang village disaster Hou traffic reconstruction, and Bulavillage whole village advance, and day care center, major project of early work. Second, develop eco-agriculture construction of the Canyon. Economic development of eco-agricultural construction in an important position, accelerated "8321" works completed caoguo 23700 acres planted, bubble 4125 acres planted walnuts, sumac 4000 acres planted, Yun Huang Lian 6040 acres planted, tea-oil tree planting 8887.8 acres. Tocultivate new economic growth points, good farmers ' well-off society of the industrial base. Third, start a poverty alleviation project. Storming the headquarters was established, well-organized, well arranged, formation of 7 supporting task force launched the poverty file state cards work in a timely manner, the task force entered the village door communication policy, mobilization mass base, making poverty eradication plan, and find out about poverty, assist in the implementation ofprojects最后的操作,应单击”HOME”键返回在线显示. 此时,PV 值应为零点值并且AO( 4-20MA)应为4.00MA.如PV 仍有误差,可再进行一次.如PV 正确,但4.00MA 有误差,则需进行校验菜单的第2 项- Trim analog output/校准模拟量输出.以下为操作菜单:双击选项1,确认系统处于手动状态,并将标准电流表串入变送器回路然后点击OK 3 次.进入编辑菜单.meters village between road hardening, 11 km of pass group Highway, livelihood project; ordered advance XX finished pupils canteen, and wangji alone finished small teaching floor, and wangji alone finished pupils canteen, and ancient Dang "culture tourism features village", and wangji alone village and Bula village River suspension, and Bula village la Los end of pass group Highway, and XX Meters village debris flow disaster control, building project; started has victims will LOS, wood child moving, and autumn baby, pass group highway construction project; solid do "a water two dirt" regulation, and wood added Jia village, XING side fumin, and XX meters village pass village Highway hardening, and ancient Dang village disaster Hou traffic reconstruction, and Bula village whole village advance, and day care center, major project ofearly work. Second, develop eco-agriculture construction of the Canyon. Economic development of eco-agricultural construction in an important position, accelerated "8321" works completed caoguo 23700 acres planted, bubble 4125 acres planted walnuts, sumac 4000 acres planted, Yun Huang Lian 6040 acres planted, tea-oil tree planting 8887.8 acres. Tocultivate new economic growth points, good farmers ' well-off society of the industrial base. Third, start a poverty alleviation project. Storming the headquarters was established, well-organized, well arranged, formation of 7 supporting task force launched the poverty file state cards work in a timely manner, the task force entered the village door communication policy, mobilization mass base, making poverty eradication plan, and find out about poverty, assist in the implementation ofprojects使用光笔点击数字键,输入标准表的读数,例如:4.025MA.点击ENTER确认.接下来的提示将问你此时的输出是否与标准表一致.如一致,则选1/Yes. 如不一致,则需重做,选2/No.下一步,将对20MA点进行相同的校准.孰不重复. 最后,使用HOME 键退回在线菜单即可.注意:为确保手操器与现场仪表通讯正常,请确认回路负载电阻为250-1000欧姆,且对大多数变送器来说,输出端应保证4MA /12V 的供电.(基本能量) 如果变送器回路电缆受到强电干扰(例如与供电系统共用穿线管,则可能引起通讯问题.或回路电缆单端对地绝缘不良等).在有强干扰情况下,(例如有大功率变频器)应特别注意仪表的接地.meters village between road hardening, 11 km of pass group Highway, livelihood project; ordered advance XX finished pupils canteen, and wangji alone finished small teaching floor, and wangji alone finished pupils canteen, and ancient Dang "culture tourism features village", and wangji alone village and Bula village River suspension, and Bula village la Los end of pass group Highway, and XX Meters village debris flow disaster control, building project; started has victims will LOS, wood child moving, and autumn baby, pass group highway construction project; solid do "a water two dirt" regulation, and wood added Jia village, XING side fumin, and XX meters village pass village Highway hardening, and ancient Dang village disaster Hou traffic reconstruction, and Bula village whole village advance, and day care center, major project of early work. Second, develop eco-agriculture construction of the Canyon. Economic development of eco-agricultural construction in an important position, accelerated "8321" works completed caoguo 23700 acres planted, bubble 4125 acres planted walnuts, sumac 4000 acres planted, Yun Huang Lian 6040 acres planted, tea-oil tree planting 8887.8 acres. Tocultivate new economic growth points, good farmers ' well-off society of the industrial base. Third, start a poverty alleviation project. Storming the headquarters was established, well-organized, well arranged, formation of 7 supporting task force launched the poverty file state cards work in a timely manner, the task force entered the village door communication policy, mobilization mass base, making poverty eradication plan, and find out about poverty, assist in the implementation ofprojects2.仪表校验的方法及常见故障分析.2-1.* 压力变送器效验的基本条件:通常,仪表校验应在试验台上正常环境温度下进行.所使用的标准压力源的参考精度至少为被测表的3-4倍.电流标准应使用3位半以上的数字万用表.除此以外,275/375 HART 手操器是必备工具.2-2.* 什么情况需要进行校验:常见的故障大致为:1. 仪表PV值与实际压力不一致.2. 仪表PV值与实际压力一致,但4-20MA 输出与标准表不一致.上述两个参数均对不上. 3.以下分别针对这些问题进行分析解决.3051C型仪表是智能化变送器,感压膜头的信号首先通过A/D转换,接着由内部数据处理器将该信号通过标定曲线再转换为用户组态的压力变量(即PV值)进行显示.最后经D/A转换形成4-20MA输出.当我们用手操器进行膜头校验时,实质上是对上述曲线进行矫正.我们称为: SENSOR TRIM!FULL TRIM 及ZERO TRIM 等.通常,这些操作菜单都在 SENSOR TRIM 下,具体选FULL TRIM 还是 ZERO TRIM 要看具体误差的情况.但是,不同的变送器对曲线的矫正度有不同的限制,通常为满量程的3-5%!A. 使用ZERO TRIM,如果仪表在安装结束后,处于零点状态,或差压表虽为平衡状态,但管道内有静压,此时仪表的输出会有很小的偏差(0.25-0.31Kpa)视安装位置及仪表类型而不同,此时应使用ZERO TRIM进行矫正.这种操作仅对标定曲线进行平移,并不影响斜率,因此是针对D/A的单点校验.如果用户手头没有HART手操器,而且仪表本身具有外部零点调整按钮,此项矫正也可以通过激活(按住2秒以上)该外部按钮完成.所不同的是,这种操作只将当前的零位PV值调整为4MA,压力的读数并不改变!相当于进行了一次微量零点迁移.B. 使用FULL TRIM,此项调整为两点校验,需标准压力源进行打压,因此只能在离线情况下进行.此项操作为针对膜头内部A/D的校正.meters village between road hardening, 11 km of pass group Highway, livelihood project; ordered advance XX finished pupils canteen, andwangji alone finished small teaching floor, and wangji alone finished pupils canteen, and ancient Dang "culture tourism features village", and wangji alone village and Bula village River suspension, and Bula village la Los end of pass group Highway, and XX Meters village debris flow disaster control, building project; started has victims will LOS, wood child moving, and autumn baby, pass group highway construction project; solid do "a water two dirt" regulation, and wood added Jia village, XING side fumin, and XX meters village pass village Highway hardening, andancient Dang village disaster Hou traffic reconstruction, and Bulavillage whole village advance, and day care center, major project of early work. Second, develop eco-agriculture construction of the Canyon. Economic development of eco-agricultural construction in an important position, accelerated "8321" works completed caoguo 23700 acres planted, bubble 4125 acres planted walnuts, sumac 4000 acres planted, Yun Huang Lian 6040 acres planted, tea-oil tree planting 8887.8 acres. Tocultivate new economic growth points, good farmers ' well-off society of the industrial base. Third, start a poverty alleviation project. Storming the headquarters was established, well-organized, well arranged, formation of 7 supporting task force launched the poverty file state cards work in a timely manner, the task force entered the village door communication policy, mobilization mass base, making poverty eradication plan, and find out about poverty, assist in the implementation ofprojects进行这一操作,必须先进行低端调整(Low sensor trim)再进行高端(Upper sensorTrim).进行FULL TRIM 以后,仪表的标定曲线完成了拟合.进入膜头校验菜单后(见下图)选中2,或直接按2键即可进入操作!。
压力变送器常见故障及处理方法压力变送器维护和修理保养一、变送器无输出1:查看变送器电源是否接反；解决方法:把电源极性接正确2:测量变送器的供电电源，是否有24V直流电压；解决方法:必需保证供应变送器的电源电压12V（即变送器电源输入端电压12V）。
假如没有电源，则应检查回路是否断线、检测仪表是否选取错误（输入阻抗应250）；等等。
3:假如是带表头的，检查表头是否损坏（可以先将表头的两根线短路，假如短路后正常，则说明是表头损坏）；解决方法:表头损坏的则需另换表头，4:将电流表串入24V电源回路中，检查电流是否正常；解决方法:假如正常则说明变送器正常，此时应检查回路中其他仪表是否正常。
5:电源是否接在变送器电源输入端；解决方法:把电源线接在电源接线端子上。
二、变送器输出20mA1: 变送器电源是否正常解决方法:假如小于12VDC，则应检查回路中是否有大的负载，变送器负载的输入阻抗应符合RL（变送器供电电压—12V）/（ 0.02A）2:实际压力是否超过压力变送器的所选量程；解决方法:重新选用适当量程的压力变送器。
3:压力传感器是否损坏，严重的过载有时会损坏隔离膜片。
解决方法:需发回生产厂家进行修理。
4:接线是否松动；解决方法:接好线并拧紧5:电源线接线是否正确解决方法:电源线应接在相应的接线柱上三、变送器输出4mAOutput4mA1:变送器电源是否正常解决方法:假如小于12VDC，则应检查回路中是否有大的负载，变送器负载的输入阻抗应符合RL（变送器供电电压—12V）/（ 0.02A）2:实际压力是否超过压力变送器的所选量程；解决方法:重新选用适当量程的压力变送器压力传感器是否损坏，严重的过载有时会损坏隔离膜片。
解决方法:需发回生产厂家进行修理。
四、压力指示不正确Wrong indication1: 变送器电源是否正常解决方法:假如小于12VDC，则应检查回路中是否有大的负载，变送器负载的输入阻抗应符合RL（变送器供电电压—12V）/（ 0.02A）2: 参照的压力值是否确定正确解决方法:假如参照压力表的精度低，则需另换精度较高的压力表。
罗斯蒙特3051压力（（差压））变送器检修与维护一、变送器拆卸1.确认变送器一次门可靠关闭（温度除外）。
2.关闭并确认变送器二次门可靠关闭。
3.打开变送器排污门确认可靠泄压后关闭。
4.拧开变送器标有:“接线侧”一侧盖口”。
5.解除信号线,用绝缘胶带保护好信号线及其电缆标号。
6.拆除变送器引压管接头，并用胶带妥善保护引压管头部。
7.拆除变送器固定螺丝,将变送器从支架上取下来。
8.对变送器清扫表面灰尘,用白胶布作好设备标签贴至变送器表面。
9.变送器送至校验场所并放置2小时以上,待校验。
二、校验前检查1.变送器外观完整,无污物,铭牌完整。
2.外观检查无变送器硅油漏泄。
3.机械部件完整无损。
三、压力变送器校验1、密封性检查注：首次校验应进行此项校验，后续校验合使用中检验可不进行此项校验。
1 ）平稳地升压（或疏空），使压力变送器测量室压力达到测量上限（或当地大气压力90 ％的疏空）。
2 ）关闭压力源保持密封15分钟，应无泄漏。
3 ）在最后5 分钟内通过压力表观察，其压力值下降（或上升）不得超过测量上限值的2 ％。
4 ）差压变送器在进行密封性检查时，高低压力容室连通，并同时引入额定工作压力进行观察。
2、调整前测试1 ．选择与变送器相适应加压装置及压力模块。
2 ．将被检变送器与加压装置、压力模块、福禄克、3051 变送器手操器相连接好。
3 ．按信号量程的25 ％递增，从0 ％到100 ％依次对变送器加压，读取每点电流指示值，作好记录。
4 ．加压至量程的100 ％后逐渐减压，在100 ％到0 ％之间按量程的25 ％递减，观察各点电流值，并作好记录。
5 ．重复步骤3和4一次，将误差较大一次的数据作为最终数据记录。
6 ．检查上述操作中零点和满量程无漂移。
7 ．计算基本误差及回程误差，保留小数位2 位。
8 ．基本误差及回差小于等于量程的±0.5 % （±0.08mA ) ，则此变送器精度合格。
9 ．基本误差及回差大于量程的±0.5 % （±0.08mA ) ，则此变送器精度不合格，需要调整。
3051型压力变送器操作规程一、引言3051型压力变送器是一种常用的工业自动化仪表，广泛应用于各个行业的压力测量和控制过程中。
为了确保3051型压力变送器的正常运行和正确使用，制定本操作规程。
二、适合范围本操作规程适合于3051型压力变送器的操作、维护和保养。
三、术语和定义1. 压力变送器：一种将被测压力转换为标准电信号输出的仪表。
2. 静态压力：指压力变送器在无压力输入时的输出信号。
3. 过载压力：指压力变送器能承受的最大压力值。
4. 输出信号：指压力变送器输出的电信号，通常为4-20mA或者0-10V。
四、操作规程1. 安装与接线1.1 确保安装位置符合工艺要求，并避免受到振动、冲击和高温等外界干扰。
1.2 使用合适的密封材料和正确的安装方法，确保压力变送器与被测介质之间的连接密封可靠。
1.3 接线时，请按照接线图进行正确的接线，确保电源和信号线的接线坚固可靠。
2. 调零与调整2.1 在安装完成后，先进行调零操作。
将被测压力归零后，调节零位调节螺丝，使输出信号接近零值。
2.2 进行静态压力校准。
将被测压力加到额定范围内，调节量程调节螺丝，使输出信号与被测压力相对应。
2.3 进行动态压力校准。
将被测压力作周期性变化，观察输出信号的变化情况，并根据需要进行调整。
3. 使用与维护3.1 在正常使用过程中，应定期检查压力变送器的工作状态。
如发现异常，应及时进行维修或者更换。
3.2 避免压力变送器长期处于过载状态，以免损坏传感器。
3.3 定期清洁压力变送器的外壳，并检查连接路线的接触是否良好。
3.4 如需更换部件或者进行维修，请按照厂家提供的操作手册进行操作，确保操作正确。
3.5 定期校准压力变送器的零位和量程，确保测量的准确性。
五、安全注意事项1. 在操作过程中，应注意避免触摸高温部件，以免烫伤。
2. 使用前请检查电源路线是否接地良好，以确保工作安全。
3. 在进行维护和更换部件时，应先切断电源，并确保压力变送器处于安全状态。
实验三AO3051智能电容式压力/差压变送器的调试一、实训目的（1）了解电容式压力（差压）变送器的性能、结构和安装方法（2）学习电容式压力（差压）变送器的零位、量程、零点迁移的调整方法（3）了解变送器使用时的接线方法二.、仪器与设备被校的AO3051压力变送器、精密弹簧压力表、活塞压力校验台、数显表、扳手、螺丝刀、导线(2根)、插座、插头、兆欧表。
三、实训内容和步骤1．选用仪器、仪表、工具.(1) 精密弹簧压力表的选用应根据被校AO3051变送器的量程而定，应比变送器的量程稍大即可。
(2) 精密弹簧压力表在使用前应保证其指针指在零刻度线，否则应用取针器将指针取出，保证其在垂直方向上指零。
(3) 数显表在使用前应进行量程和上、下行限的设置以及跳板线的设置。
2．活塞压力校验台排空气首先应该将校验台的油杯打开，并保证油量至少达到油杯容积的1/3。
然后关掉2个进油阀，反复转动手柄对油杯里面的油进行排气，完毕后关掉油杯阀，再打开其中一个进油阀，并对它进行排气。
再关掉这个进油阀，之后再继续排完另一个进油阀的空气，然后将其阀门关掉。
3．仪表安装将校验台空气排完后，将精密弹簧压力表，AO3051变送器分别安装在校验台上并保证其方位一致，便于读数。
4．仪表接线将数显表的3,6端分别接入AO3051变送器的正负两端，将14,15号端接入到220伏的交流电压。
5．绝缘性检查将兆欧表的两个端子分别接到变送器的接地端，然后以每分钟顺时针120转的速度转动兆欧表，待调速器发生滑动后即可读数，如果其读数大于100ΜΩ，说明其绝缘性良好。
6．校验过程将仪表安装好后，(1) 先根据3051变送器的量程选好最少5~10个校验点，包括零点和最大量程，并根据变送器所受压力与其输出电流的线性关系算出每个校验点分别对应的标准电流。
(2) 同时打开两个进油阀，转动手柄加压到最大量程测试它的耐压性。
(3) AO3051为智能变送器，在变送器面板上有按键可以直接调整量程及零点。
3051压力变送器的检修3051压力变送器的检修压力和差压是工业生产过程中常见的过程参数之一。
在许多场合需要直接检测、控制的压力参数，如锅炉的气包压力、炉膛压力、烟道压力；化学生产中的反应斧压力、加热炉压力等。
此外，还有一些不易直接测量的参数，如液位、流量等参数往往需要通过压力或差压的检测来间接获取。
因此，压力和差压的测量在各类工业生产领域中如石油、电力、化工、冶金、航天航空、环保、轻工等占有很重要的地位。
第一节变送器基础知识变送器在自动检测和控制系统中的作用，是将各种工艺参数，如温度、压力、流量、液位、成分等物理量转换成统一的标准信号，以供显示、记录或控制之用。
分类──按被测参数差压变送器压力变送器温度变送器液位变送器流量变送器等变送器的理想输入输出特性一、变送器的构成原理模拟式变送器的构成原理数字式变送器的构成原理（1）模拟式变送器的构成原理模拟式变送器的组成：测量部分，放大器，反馈部分，零点调整和零点迁移模拟式变送器的输入输出关系当满足 >>1的条件时模拟式变送器的理想输入输出特性（2）数字式变送器的构成原理：数字式变送器组成:二大部分硬件电路──以微处理器CPU为核心软件──包括系统程序和功能模块a.数字式变送器的硬件构成智能式变送器还配置有手持终端(外部数据设定器或组态器)，用于对变送器参数进行设定，如设定变送器的型号、量程调整、零点调整、输入信号选择、输出信号选择、工程单位选择和阻尼时间常数设定以及自诊断等。
b.数字式变送器的软件构成──包括系统程序和功能模块系统程序:对变送器硬件的各部分电路进行管理，并使变送器能完成最基本的功能，如模拟信号和数字信号的转换、数据通信、变送器自检等功能模块可能有：资源模块变量转换阻尼时间设定模拟输入显示转换量程自动切换运算功能非线性校正 ·PID 控制功能温度误差校正警报（3）罗斯蒙特3051压力变送器的工作原理3051系列差压变送器是由Fisher-Rosemount公司生产的一种高性能两线制变送器。
他属于一种智能型的电容式变送器。
由传感组件和电子组件两部分组成。
配线和组态组态内容：①变送器操作变量设置。
线性或平方根输出、阻尼时间、工程单位选择等。
②变送器物理和初始信息。
日期、标签、法兰材质等。
二、变送器的一些共性问题✧量程调整✧零点调整和零点迁移✧线性化✧变送器信号传输方式1、量程调整使变送器的输出信号上限值ymax与测量范围的上限值xmax相对应。
量程调整相当于改变变送器的输入输出特性的斜率，也就是改变变送器输出信号y与输入信号x之间的比例系数。
量程调整的方法：➢模拟式变送器：改变反馈部分的反馈系数；改变测量部分转换系数。
➢数字式变送器：软件实现。
2、零点调整和零点迁移使变送器的输出信号下限值ymia与测量范围的下限值xmin相对应在xmin=0时，称为零点调整；在xmin≠0时，称为零点迁移。
零点调整使变送器的测量起始点为零，零点迁移是把测量的起始点由零迁移到某一数值。
当测量的起始点由零变为某一正值，称为正迁移。
当测量的起始点由零变为某一负值，称为负迁移。
零点调整和零点迁移的方法：➢模拟式变送器：改变放大器输入端上的调零信号z0。
➢数字式变送器：软件实现。
零点迁移，再辅以量程调整，可以提高仪表的测量精度。
3、线性化原因：传感器组件的输出信号与被测参数之间往往存在着非线性关系。
模拟式变送器非线性补偿方法:a.使反馈部分与传感器组件具有相同的非线性特性b.使测量部分与传感器组件具有相反的非线性特性数字式变送器非线性补偿方法：软件实现。
4、变送器信号传输方式气动变送器：两根气动管线电动模拟式变送器：二线制；四线制。
数字式变送器：双向全数字量传输信号(现场总线通信方式 ) ，HART通讯协议方式。
a.电动模拟式变送器信号传输方式二线制：二根导线同时传送变送器所需的电源和输出电流信号四线制传输：供电电源和输出信号分别用二根导线传输二线制优点：节省连接电缆、有利于安全防爆和抗干扰条件：工作电流：工作电压：最小有效功率P:b.数字式变送器信号传输方式HART通讯协议：在一条电缆上同时传输4～20mA的模拟信号和数字信号。
HART通信协议是依照国际标准化组织(ISO)的开放式系统互连(OSI)参考模型，简化并引用其中三层：物理层数据链路层应用层。
物理层──规定了信号的传输方法和传输介质信号传输：基于Bell 202 通讯标准，采用频移键控(FSK)方法，在4～20mA基础上叠加幅度为±0.5mA的正弦调制波作为数字信号传送速率为1200 bit/s传送速率为1200 bit/s数据链路层──规定了数据帧的格式和数据通讯规程数据帧格式：由链路同步信息、寻址信息、用户信息及校验和组成定界符定义了帧的类型和寻址格式响应码在变送器向主设备通信时才有，表示数据通信状态和变送器工作状态HART协议按主/从方式通讯，这意味着只有在主站呼叫时，现场设备（从站）才传送信息有三种通讯模式：点对点模式---在一条电缆上传输4～20mADC的模拟信号和数字信号多点模式---一条电缆连接多个现场设备，这是全数字通信模式阵发模式---允许总线上单一的从站自动、连续地发送一个标准的HART 响应信息应用层──规定了通讯命令的内容命令类型：通用命令：适用于所有符合HART协议的现场仪表通用操作命令：适用于大部分符合HART协议的现场仪表特殊命令：各制造厂的产品自己所特有的命令HART通讯方式的实现方法输出波形整形电路: 满足HART物理层规范所要求的信号波形上升沿/下降沿的时间，较平缓的上升沿/下降沿的时间可以降低与其它HART网络间的串扰带通滤波器: 抑制接收信号中的感应噪声，其频宽大约为1200 Hz～2200Hz HART通讯模块HART通讯模块实现二进制的数字信号与FSK信号之间的相互转换调制器 ITXD：二进制数字信号输入OXTA：FSK信号输出解调器 IRXA：FSK信号输入(由信号回路)ORXD：二进制数字信号输出INRTS：控制端低电平“0” ，调制器工作，解调器输出不定；高电平“1” ，解调器工作，调制器输出呈高阻状态。
载波监测电路用于检测4～20mA直流信号中是否叠加有数字信号 ,侦听网络和启动接收时基电路产生调制器和解调器所需的时间基准信号，同时还提供19.2kHz 的脉冲输出AD42116位串行输入、4～20mA电流输出与HART通信模块共同完成变送器的数字通信组成：数模转换器、电流转换器和电压调整器AD421及电压调整电路原理图现场总线通信方式通信控制单元实现物理层的功能，完成信息帧的编码和解码、帧校验、数据的发送与接收通信控制单元实现物理层的功能，完成信息帧的编码和解码、帧校验、数据的发送与接收第二节： rosemount3051压力变送器的安装一、安装要求：液体流量测量• 在管线侧安装龙头以防止沉淀物质沉积在变送器过程隔离器上。
• 将变送器安装在龙头旁边或龙头下方，使气体能排入过程管线。
• 将排液/排气阀朝上安装以方便气体排放。
气体流量测量• 将龙头安装在管线顶端或侧边。
• 将变送器安装在龙头旁边或上方使液体排入过程管线。
蒸汽流量测量• 将龙头安装在管线侧边。
• 将变送器安装在龙头下方以确保引压管线始终充满冷凝水。
• 将引压管线充满水以防止蒸汽直接与变送器接触并确保测量精确启动。
注释：在蒸汽或其他高温测量中，对于硅油灌充变送器，共面过程法兰处的温度不能超过 250 °F （121 °C），对于惰性液灌充变送器，不能超过 185 °F（85 °C）。
在真空测量中，这些温度极限下降到：对于硅油灌充变送器为 220 °F（104 °C）且对于对于惰性液灌充变送器为 160 °F （71 °C）。
3051L 型、3051H型和传统法兰可经受更高温度。
气体或液体测量气体测量蒸汽测量«Skip Record If...»«Skip Record If...»«Skip Record If...»二、过程连接3051 型在变送器法兰上的过程连接采用 1/4-18 NPT。
带 1/2-14 NPT 连接器的法兰接头联接件在订货时必须采用 DF 选项。
螺纹级别为 2 级；进行过程连接时，采用您厂认可的润滑剂或密封剂。
在变送器法兰上的过程连接应在 2 1/8"（54 mm）中心距上以保证直接与三阀组或五阀组进行安装连接。
旋转一个或两个法兰接头可达到 2"（51 mm）、2 1/8 " （54 mm）或者 2 1/4 "（57 mm）的连接中心距。
施加前，安装并拧紧所有四个法兰螺栓，否则将导致过程泄漏。
正确安装后，法兰螺栓将经模块外壳顶端伸出。
在变送器运行期间，严禁松开或拆除法兰螺栓。
将接头与共面法兰进行安装连接时，应遵守下列安装程序：1、拆除法兰螺栓。
2、使法兰就位，将接头移入定位并安装 O 形环。
3、用供应的大型螺栓将接头和共面法兰与变送器模块拧紧。
4、拧紧螺栓。
警告法兰接头 O 形环的不当安装可导致过程泄漏，并引发死亡或重伤事故。
两个法兰接头可通过独特的 O 形环凹槽进行识别。
只可使用为特殊法兰接头而设计的 O 形环，如下所示。
3051S 型/ 3051 型/3001 型/3095 型/2024 型«Skip Record If...»受压时，特氟隆（Teflon® ）O 形环趋于冷变形，这有助于提高其密封能力。
您无论何时拆除法兰或接头，应当对特氟隆 O 形环进行目视外观检查。
如果有任何损坏，如刻痕或切口，都应及时更换。
如果没有损害，可重新利用。
如果更换 O 形环，在安装后要再拧紧法兰螺栓以实现对冷变形进行补偿。
关于过程传感器本体重新装配程序，请查阅：故障检修。
«Skip Record If...»引压管线过程和变送器间的管线必须精确地传送压力以获得精确的测量结果。
有五种误差来源：压力传送、泄漏、磨擦损失（特别在采用冲洗时）、液体管线中存气、气体管线中存液和管段间的密度差异。
变送器在过程管线中的最佳位置取决于过程本身。
按照下列指南确定变送器位置和引压管线的布置：• 使引压管线尽可能短。
• 对于液体测量，引压管线自变送器与过程连接处按每英尺至少 1 英寸的比值向上倾斜（80：1000）。
• 对于气体测量，引压管线自变送器与过程连接处按每英尺至少 1 英寸的比值向下倾斜（80：1000）。
• 在液体管线中应避免高点，在气体管线中应避免低点。
• 应确保两条引压管线的温度相同。
