SAN4-40M DAI-ICHIDENTSU
SAN4-40M DAI-ICHIDENTSU
SAN4-40M DAI-ICHIDENTSU
储罐计量是对大型储罐内液体的测量，目的是量化储罐内产品的容积和质量。
油气行业通常使用储罐内介质的静态体积评估技术。其中包括液位、温度和压力测量。有多种不同的方法可对液体的液位和其他属性进行测量。测量方法取决于储罐类型、液体类型和储罐的使用方式。
储罐内会贮存大量高价值的液态产品。在任何给定时间内对储罐内介质进行评估时，储罐计量系统的精度性能显得尤为重要。
储罐计量技术可应用于炼油厂、油库、输油管线、机场和大型仓储储罐区上。储罐通常有四种基本设计：立式圆桶形拱储罐、立式圆桶形浮顶储罐以及球形或卧式带压储罐。所有这些储罐类型都可配备储罐计量型仪表进行使用。
为了准确地评估储罐内介质状态，在保证精确液位测量的同时，对于罐内温度的测量也同样重要。所有液体都具有热膨胀系数，在计算不同温度条件下的体积时，需进行适当的体积补偿。为了实时计算平均视密度和产品质量，通常还会进行储罐底部的压力测量。
现代储罐计量系统将储罐测量数字化，并以数字化方式将储罐信息传输至控制室，再由控制室将液体体积和质量信息分发给库存数据用户。
·什么是储罐计量？
·储罐计量技术
·工程标准和认证
·容积和质量评估
·精度和过程中的不确定度
·温度测量
·液化气
·更多传感器
·系统架构
·防溢罐
·附录：典型的储罐计量组态
·参考
interface and simple maintenance;
2. Industria1 “system communication
Industrial ial “the system uses the international standard industrial bus. The field controller supports PROFIBUS, FF, MODBUS, can and other countries
International standard fieldbus, PROFIBUS is the most widely used open fieldbus international standard in the world, which is divided into FMS, DP and pa
Level III, DP communication rate can be up to 12MB. PROFIBUS is used to connect distributed i/0 stations, field bus instruments and other intelligent devices.
The communication among process station, operator station and engineer station is realized through the system bus diginets (Industrial Ethernet). user
Different transmission media (RJ45 twisted pair, thin cable, thick cable or optical fiber cable and mixed media) and network topology can be selected for the system bus
Due to the adoption of tcp/ip protocol, the system can also realize ultra long distance communication with the help of public telephone network (dial-up mode) or satellite.
PLC and other subsystems communicate with industrial “system through Modbus protocol interface. The system also supports iec870-5 over control coordination
Discussion.
The flash EPROM inside PS provides more than 220 function modules (control algorithm subroutines), in addition to the base specified in IEC 61131 3 standard
In addition to this content, many powerful and strictly tested function blocks from practical engineering applications are also expanded. Any complex control
All schemes can be realized by the combination of these function blocks.
The function blocks provided by the system mainly fall into the following categories:
o
Analog quantity processing
o
Digital quantity processing
Loop adjustment
Logical sequence control
c
Logical operation
Monitoring function
Acquisition function
c
Arithmetic operation
c
Tcp/ip protocol communication interface
Modbus protocol communication interface
1ec870-5 protocol communication interface (telecontrol)
4.2 field controller PS
Industrial ial “field controller PS is a special process control station, which is embedded with a fieldbus communication interface for users to use
Fieldbus technology provides a very flexible choice. Each PS is allowed to insert 4 fieldbus interface cards (card types can be different),
Each card is connected to a fieldbus to collect process data and diagnostic information from the bus. The interface card is easy to replace and plug and
