ProfiBusDP总线型称重仪表在精细化工行业的应用

ProfiBusDP总线型称重仪表在精细化工行业的应用
梅特勒－托利多邓锐
近年来，随着涂料行业的快速发展，越来越多的数企业对配料精度和自动化程度提出更高的要求，原有的机械秤、流量计或料位计等计量方式，已经远不能满足企业生产工艺以及长期稳定使用的要求。

为了提高产品品质和企业效益，确保配料精度和生产线长期可靠运行，很多化工企业开始使用以梅特勒-托利多“称重模块系统”为代表的称重解决方案，完成配料的计量和控制。

梅特勒-托利多称重配料系统由
称重模块、ProfibusDP总线型称重
仪表(如：IND131/331、IND560、
IND780等)、PLC和接线盒等附件组
成。

系统结构如图所示。

以一个典
型的化工反应釜的称量为例，安装
在反应釜底部的三个压式称重模块
将釜体的重量信号传至接线盒，接
线盒中将经过汇集后的重量信号送
至总线型称重仪表。

总线型称重仪
表将重量信号处理成相应的重量数
据，通过ProfibusDP上传至PLC
或DSC上位系统。

相对于传统的计量方式，称重
法配料系统可以更经济的方式提供更高的测量精度（±0.1%），且标定简单，轻松应对生产过程的改变和物料的变更，适用气、液、固体和浆状物各种物料。

在应用的过程中，由于称重模块系统不会接触物料，因此它不易受到物料的污染和腐蚀影响，而拥有更长的使用寿命。

Application of ProfiBusDP fieldbus controlled weighing terminal in the Fine Chemical Industry
In recent years, with the rapid development of the coating industry, more and more companies raise higher requirements for batching accuracy and automaticity. However, traditional measurement methods, such as mechanical scales, flow meter or level gage, can no longer meet the demands of production process and long-term stability. In order to improve product quality and profitability, a lot of chemical companies choose to use weighing solutions, which takes Mettler-Toledo weigh module system as representatives, for batching meter and control.
Mettler Toledo Weighing and
Batching system is mainly composed
of weighing modules, ProfiBusDP
fieldbus controlled weighing terminal
(e.g. IND131/331、IND560、IND780),
PLC, junction box and so on. The
system structure is shown in the figure
on the left. Take the weighing of a
chemical reaction kettle as an example,
the three pressure weighing modules
installed in the bottom of the kettle
capture the weighing signals of the
kettle and transmitted to the junction
box, which collects all the signals and
send it to the fieldbus controlled weighing terminal. The terminal then changes it into the voltage signal and finally sends into the PLC or DSC host system through ProfiBusDP.
Compared with traditional measurement methods, weighing and batching system is more economical and provides higher measurement accuracy（±0.1%）,Its also very easy to calibrate and can easily deal with the changes in production process and materials which can be gas, liquid ,solid or paste. Because the weighing module system doesn’t contact the materials in the process of application, It’s less susceptible to the contamination and corrosion of the materials which means it will have a longer service life.。