191921-T06

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191921-T06

误差和错误是不同的,我遇到的情况常常是读数错误而不是误差,一般现在无论使用什么测量工具只要按要求安装,测量系统误差在2.5%是不难的。很多测量不正确,是由于测量错误。
    1、温度测量
    温度测量主要有热电偶和热敏电阻两类,但细分就很多了。一般的温度测量仪器,内部的补偿曲线不足以满足所有温度探头的要求,比较粗糙。要保证温度测量准确必须准确了解产品的分度,选择合适的补偿曲线。WEST温控器补偿曲线较好(欧版),我用它做过0.1C精度的控制系统。欧陆的温控器也适合精密温度控制,RKC可以满足一般要求(1C),但RKC仿造较多,国产数字温控器,难得满足有严格温度控制精度要求的场合。问题不是传感器的问题,而是PID算法的问题,试过一些调整很费劲,鲁棒性不行!
    2、压力测量
    主要问题是取样管路问题和压力感应片失效或回复性不行,造成变送器不准确,这是错误而不是误差,因为设计没有问题而元件失效不算误差!
    3、流量测量
    流量测量无论是孔板、涡街、超声波要注重原理的适应性。涉及到温度、压力补偿还要注意适用性。比如一般我们都会每日或每小时或实时读取流量但是不太注意记录温度和压力,压力和温度不正确蒸汽流量就不正确,因为蒸汽的质量流量取决于密度,而密度与温度、压力有关,这时不是误差误差,而是错误!
    4、化学成分的测量
    化学成分比如三原子气体测量,需要定期校验和清洗探头,COD测量也一样,更多的是测量错误而不是误差。
    在工厂实践中很多情况将测量错误当误差是不对的。超过按原理计算数据的5%,应该认为是错误,误差一般应限定在2.5%之内。
    具体来说,孔板流量计测量饱和蒸汽。温度探头、压力变送器、压差变送器都经过校验。流量计内部设定参数和选定公式都符合原理要求。这是你按压差、温度计算出质量流量应该和仪表显示一致。但现在发现计算的数值比显示数据小1/3,这就不是错误。有经验的常选择压力补偿,压力变送器一定有问题。这是错误而不是误差。问题是错误发生很久了,人们觉得显示不对,以为是误差,这是错误的。

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主营DCS系统配件
机器人系统配件
大型伺服系统配件
品牌:ABB   ,AB  ,GE,FOXBORO,本特利,英维思,伍德沃德,西屋,瑞恩,施耐德,西门子,摩托罗拉,安川。力士乐。ACSO,横河等进口品牌。 专业销售进口DCS  PLC系统备件模块
Triconex Siemens Yaskawa ABB GE Ovation AB Foxboro Motorola Schneider XYCOM KUKA
  专业销售进口DCS  PLC系统备件模块 15天包退换 一年质保 大量现货  国内实力库存商家

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专业销售进口DCS  PLC系统备件模块

PLC模块,可编程控制器,CPU模块,IO模块,AI模块,通讯模块。AB/施耐德/ABB/GE/本特利/西屋/英维斯/霍尼韦尔/黑马/FU克斯波罗

15天包退换 一年质保 大量现货  国内实力库存商家


选择深圳长欣,选择放心,售后无忧大量现货,当天顺丰发货!
主营:本特利,英维思,伍德沃德,福克斯波罗、西屋、瑞恩、施耐德莫迪康、ABB、AB、西门子、摩托罗拉、GE发那科、安川、博世力士乐,ACSO,力士乐等各大品牌的DCS系统配件,机器人系统配件,大型伺服系统备件。

先介绍几点经验。
1、先通读一遍“系统手册”(不管能不能看懂,先了解个大概,以便学习编程时查找);
2、由位控逻辑入手,逐渐增加定时、计数等条件,把或、与、非关系理顺;
3、进而练习整数运算、实数运算、类型转换;
4、量程转换、PID调节回路的建立及P、I、D参数的理解(最好是有个物理回路验证,比如变频器+电机+测速传感器);
5、循环、顺序、跳转等程序控制(尽量避免跳转,非跳不可时也是跳的越近越好);
6、中断、通讯、位置控制....

本人以ABB工业机器人配件DSQC系列和Motorola MVME系列,GE 卡件 模块 驱动器系列为主攻。各位电工朋友可根据自己的条件选择适合自己的PLC品牌,由于PLC的基本框架大同小异,学会一种至于其它的学习起来也就简单了。