Metering Software ( Custody Sales Metering )

General Signal Flow Diagram

   Flow compuer selection signal is sent from selection swithch of Metering Panel  to PLC. PLC controls MOV to perform auto swithcing by refering to flowrates from selected flow computer. G/C controller sends Gas composition data to flow compuer for volume correction and density calculation. HMI PC communicates with each flow computers and saves process data. G/C operation PC is used for monitoring chroatogram, G/C status and G/C calibration.

General Application Software Configuration

Application softwares  consist of HMI, I/O Serverand Report Program. HMI program communicates with Report Program by DDE. So HMI can print control of Report Program like a automatic hourly,daily, monthly report print and manual print. General MODBUS I/O Server only supports 32bit single precision floating format. However MReport suports 64bit double precision floating format and directrly commuicate with flow computer.

HMI Example Screen and MReport Program

Following example is  orifice type station has 4 meter run. Each meter run has MOV so that auto meter run switching or manual valve operation is possible. Flow computer is hot/stand-by configuration. This natural gas station has 1 G/C to send gas composition data to flow compuers.

HMI Main Screen	MReport Program