详细介绍
VF系列涡街流量计(旋涡型)是根据卡门旋涡原理,采用的微功耗处理器和频谱分析的方法采集数据及*的流量仪表制造工艺技术,成功开发出智能机电一体化的新型涡街流量计。仪表常数稳定,测量范围广,压力损失小,安装及使用维护方面简单、经济。特别是解决了耐高温、抗振动、微功耗等关键性问题。广泛应用于封闭管道中蒸汽、气体和液体介质的质量流量和体积流量的计量。
主要技术参数
1.测量介质:液体、气体、过热/饱和蒸汽
2.准确度:±1.0%、±1.5%
3.工作压力:1.6Mpa;2.5Mpa(其它压力,需订做)
4.介质温度:-30℃-60℃(常温型)-30℃-250℃(中温型),-30℃-300℃(高温型)
5.公称口径:DN15-DN300(管道型)DN300以上(插入式)
6.壳体材料:304不锈钢
7.防爆标志:ExdⅡBT4;
8.输出信号:脉冲输出,(4-20)m电流信号,RS-485通讯接口(modbus协议)
9.安装形式:夹接式、法兰式
10.供电:24VDC,3.6V(电池)
■ 流量计在水平管道上的安装Installation of flowmeter on horizontal pipelines
▲ 在水平管道上安装是流量计常用的安装方式
installation of flowmeter on horizontal pipelines is the most common installation mode
▲ 测量气体流量时,若被测气体中含有少量的液体,流量计应安装在管线的较高处.
When the flowmeter is used to measure gas flow,if there is small amount of liquid in the gas,the flowmeter shall be installed at the higher position of the pipeline.
▲ 测量液体流量时,若被测液体中含有少量的气体,流量计应安装在管线的较低处
When the flowmeter is used to measure liquid flow,if there is small amount of gas in the liquid,the flowmeter shall be installed at the lower position of the pipeline.
■ 流量计在垂直管道的安装
Installation of flowmeter on vertical pipelines
▲ 测量气体流量时,流量计可以安装在垂直管道上,流向不限.
When the flowmeter is used to measure gas flow,the flowmeter can be installed on the vertical pipelineand the flow direction is not limited.
▲ 若被测气体中含有少量的液体,气体流向应由上而下.
if there is small amount of liquid in the measured gas, the gas shall flow upwardly from the lower position.
▲ 测量液体流量时,液体流向应由下向上
When the flowmeter is used to measure liquid flow,the liquid shall flow upwardly from the lower position.
■ 流量计和显示仪运行前的准备工作
Preparation before the operation of flowmeter and display meter.
▲ 仔细检查流量计的安装,接线等是否正确无误.
▲ 接通显示仪电源,观察显示仪是否有流量显示.
▲ 缓慢打开阀门,到一个较小压力时停止,观察传感器周围是否有泄露现象,并观察显示仪是否有流量显示
▲ .若情况正常,开大阀门,稳定一段时间后,观察仪表显示的流量是否正常.
▲ Check the installation of the flowmeter carefully,and whether the wiring etc,is done in correct way,
▲ Connect with the power supply of the display meter,and observe whether there is flow display on the display meter.
▲ Open the value slowly and stop when the pressure is relatively low.Observe whether there is leakage around the sensor,and observe whether there is flow display on the display meter.
▲ If they are in normal condition,further open the value,and after it is stabilized for a while,observe whether the flow displayed on the meter is normal.
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在流体中设置非流线型旋涡发生体(阻流体),则从旋涡发生体两侧交替地产生两列有规则的旋涡,这种旋涡称为卡曼涡街,旋涡列在旋涡发生体下游非对称地排列。设旋涡的发生频率为f,被测介质来流的平均速度为V,旋涡发生体迎流面宽度为d,表体通径为D,根据卡曼涡街原理,有如下关系式:
f=StV/d
式中:
f-发生体一侧产生的卡门旋涡频率
St-斯特罗哈尔数(无量纲数)
V-流体的平均流速
d-旋涡发生体的宽度
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