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压力压差测量基本知识(一)

返回列表 来源:本站 发布日期: 2021-12-23 02:19:00

压力压差测量基本知识

1、法兰变送器安装时,为什么一定要选择周围环境温度比较恒定的地方?

答:法兰变送器和普通变送器不同,它的毛细管、法兰膜盒是一个密闭系统,相当于一个大温包。当周围环境发生变化时,系统内的填充液会发生膨胀收缩,从而引起系统的压力变化,它作用到变送器的敏感元件,使仪表产生附加误差。而在一般变送器中,引压导管不是密闭系统,它由温度变化而引起压力变化,可以由介质扩散到工艺流程,因而不影响仪表输出。法兰变送器安装时,一定不要使变送器和法兰膜盒系统暴露在阳光底下,以免太阳直晒,使环境温度发生剧烈变化。另外,差压变送器的两根毛细管应处于同一环境温度下,这样,一定范围内的温度变化可以互相抵消。 

2、高温高真空的法兰变送器为什么特别昂贵?

 答:法兰变送器的法兰膜盒直接和介质接触,因此法兰变送器很容易遇到高真空的操作条件。当法兰变送器在真空状态下工作时,隔离膜片受到一个向外的吸力,于是膜片外鼓,使变送器密闭系统的体积增大,填充液内的压力降低,处于真空状态。这时外部的气体有可能从焊缝处、连接处渗透到膜盒内部,使填充液中含有气体,从而影响仪表性能。法兰变送器内的填充液,其沸点温度是随着压力的降低而减低,若法兰变送器工作在负压状态,则密闭系统内会出现真空,从而使填充液的沸点降低,出现汽化。如果介质温度比填充液的沸点降低,出现汽化。如果介质温度比填充液的沸点高很多,则填充液的汽化压力会是很大的,它不仅施加到变送器传感元件,使测量产生误差,而且使隔离膜片外鼓,造成它永久变形。当变送器工作在既是高温又是高真空的条件时,填充液处于极易汽化的条件。为此,制造厂要对这种变送器进行特殊处理,充灌到膜盒中的填充液要用高温硅油,并要精确控制充灌量,既不能多,也不能少,硅油中的气体,充灌前一定要彻底排尽,膜盒预先一定要抽成绝对真空,不留残压,膜盒的焊接确保绝对牢固。所有这些,就增加了变送器的加工工作量和成本,所以高温高真空的法兰变送器特别昂贵。 

3、罗斯蒙特3051C、霍尼韦尔ST3000、横河EJA、富士FCX-A/C的传感器有何区别?

答:罗斯蒙特3051C智能变送器的传感器是硅电容式,它将被测参数转换为电容变化,然后通过测电容的方法来得到被测的差压或压力。 

霍尼韦尔ST3000系列智能变送器的传感器是复合半导体式,它将被测参数转换成硅芯片电阻值的变化,然后通过测电阻的方法来得到被测差压或压力。 横河EJA智能变送器的传感器是硅谐振式,它将被测参数转换为硅梁的振动频率,然后通过测频率来得到被测差压或压力值。 

富士FCX-A/C智能变送器的传感器是硅微电容式,它将被测参数转换为静电容量,然后通过测硅电容来得到被测差压或压力值。 

4、有一法兰变送器的额定接液温度为-15250℃,如果被测介质短时间超过这个范围,则仪表会损坏吗?

答:法兰变送器的接液温度主要由法兰膜盒内的填充液的性质来决定。当被测介质的温度超过仪表额定接液温度上限时,则会产生两种情况。 

1)填充液因受热而体积发生膨胀,甚至蒸发。如果膨胀过大,压力超过允许值,则隔离膜会产生永久变形,填充液会从连接处、焊缝处挤出来。 

2)填充液是油性物质,里面或多或少含有气体。另外,充灌前的密闭系统,也不可能抽成绝对真空,还有气体。它们虽然量很少,但因热膨胀系数大,如温度过高,也会造成隔离膜片永久变形。 综上所述,被测介质温度如超过仪表额定范围上限,轻者使仪表的技术性能变次,重者使仪表损坏,所以在选购仪表时,一定哟考虑它的接液温度不能低于被测介质的最高温度。 

如果被测介质的温度低于仪表额定温度下限,则填充液会冻凝而不能动。这样当被测介质的压力变化时,仪表的输出变化将缓解,甚至不变。但一般仪表不会损坏,当被测介质的温度恢复正常时,仪表又会正常工作。 

5、有一法兰变送器的技术指标上规定,仪表的最高接液温度为300℃,静压下限为0.13KPa abs。该表可否在被测介质的操作温度为300℃,操作压力为0.13Kpa abs的条件下工作?

 答:不可以,法兰变送器如在高温状态下工作,法兰膜盒内的填充液体积会膨胀。如果填充液在充灌过程中混有空气,则由于空气的膨胀系数远大于填充液,所以体积的膨胀会更加厉害,从而使隔离膜片外鼓,严重的甚至产生永久变形。但若被测介质的压力很大,它们作用在隔离膜片上,使它无法外鼓,这样被测介质的温度即使高一些,对仪表也不会造成影响。所以压力和温度这两个参数是有联系的,既有高温,又是高真空,对仪表造成的危害最大,否则可相互抵消一部分。本题中所说的0.13KPA abs300℃两个参数不能同时存在。如果要仪表工作在300℃,则工作压力不能是负的,必须在大气压力以上,如果要仪表工作在0.13KPa abs 的高真空下,则温度必须远低于300℃才行。 

6、利用弹簧管压力表测压力,在大气中它的指示为P,如果把它移到真空中,则压力表指示如何变化?为什么?

 答:因为大气中P表=P绝-P0(大气压),如将压力表移至真空则测的是绝压,那么P绝=P表+P0,因此该压力表指示增大。 

7、测量蒸汽流量的差压变送器安装后初次启动的操作步骤?

 答:应按下列步骤去操作: 

1)检查各个伐门,导压管、活接头等是否已连接牢固;
2)检查二次伐和排污伐是否关闭,平衡伐是否打开; 

3)稍开一次伐,然后检查导压管、伐门、活接头等,如果不漏就把一次伐全开;
4)分别打开排污伐,进行排污后,关闭排污伐;
5)拧松差压室丝堵,排除其中的空气; 

6)待导压管内充满凝结水后方可启动差压变送器; 

7)启动差压变送器应按打开正压伐,关闭平衡伐,打开负压伐。

 

8、什么是压力或差压变送器的零点调整和零点迁移? 

答:零点调整:是指输入压力或差压为零时,而输出不为零时的零点调整; 零点迁移:是指输入压力或差压不为零时输出调至零的调整。 

9、压力有静压、动压和全压之分,它们的关系是什么?压变测的是什么压力?

答:全压=动压+静压,压变测的是静压。 

10、叙述液体、气体、蒸汽压力测量仪表的正确取压位置? 

答:测量气体时:为了使气体内的少量凝结液能顺利地流回工艺管道,而不流入测量管路和仪表内部,取压口应在管道的上半部;     测量液体时:为了让液体内析出的少量气体能顺利的返回工艺管道,而不进入测量管路和仪表内部,取压口最好在与管道水平中心线以下成045°夹角内     测量蒸汽时:应保持测量管路内有稳定的冷凝液,同时也防止工艺管道底部的固体介质进入测量管路和仪表内,取压口最好在与管道水平中心线以上成045°夹角内 

11、说明绝对压力、大气压、表压及真空度的含义及相互关系。 答:绝对真空下的压力称为绝对零压,以绝对零压为基准来表示的压力叫绝对压力。表压是以大气压为基准来表示的压力,所以它和绝对压力正好相差一个大气压0.1MPa。如果被测流体的绝对压力低于大气压,则压力表所测得的压力为负压,其值称为真空度。绝对压力=大气压+表压。

12、智能变送器有何特点?

答:1)温度特性及静压特性大幅度改善; 
2
)精度高; 

3)可调量程比大; 
4
)有遥控设定功能; 
5)
有自诊断功能。

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