AGA XQ199901 : 1999

Disclaimer and Copyright
Foreword
History and Background
Acknowledgements
Table of Contents
1.0 GENERAL
  1.1 Overview of Electronic Correctors
    1.1.1 General Descriptions
    1.1.2 Basic Components
  1.2 EC Components, Input Variables and Constants
    1.2.1 Input Variable
    1.2.2 Linear Meter
    1.2.3 Pressure Transmitter
    1.2.4 Temperature Transmitter
    1.2.5 Compressibility
    1.2.6 Data Input Frequency
    1.2.7 Constant Flow Parameters
  1.3 Configuration
    1.3.1 Overview
    1.3.2 Configuration Methods
    1.3.3 Wake-Up Interval
    1.3.4 Recorded Variables
    1.3.5 Display
    1.3.6 Interval Data Storage Configuration
  1.4 Calculations
    1.4.1 Overview
    1.4.2 Correction Factors to Metered Volume
    1.4.3 Pressure Factor, Fp
    1.4.4 Temperature Factor, Ft
    1.4.5 Supercompressibility Factor, Fpv
    1.4.6 Volume Units and Energy Units
  1.5 Calibration
    1.5.1 General
    1.5.2 Calibration Procedure
    1.5.3 Accuracy Verification
    1.5.4 Calibration Adjustments
    1.5.5 Temperature Source for Calibration
    1.5.6 Pressure Source for Calibration
    1.5.7 Other Considerations
2.0 HARDWARE
  2.1 Mechanical Installation
    2.1.1 Overview
    2.1.2 Meter Mount
    2.1.3 Remote Pulse Input
    2.1.4 Pressure Tubing
    2.1.5 Temperature Thermowell
  2.2 Grounding, Isolation, Cathodic Protection
    2.2.1 General
    2.2.2 Grounding
    2.2.3 Cathodic Protection
  2.3 Electrical Installation of ECs
    2.3.1 General
    2.3.2 Identification of Hazardous Areas
    2.3.3 Identification of Equipment Listed for Use
           in Hazardous Locations
    2.3.4 Hazardous Locations and Installation
           Practices
  2.4 Power Options
    2.4.1 General
    2.4.2 Internal Self-Contained Power Supplies
    2.4.3 External Power Supplies
  2.5 Output Variables
    2.5.1 Overview
    2.5.2 Index or Display Type
    2.5.3 Pulse Outputs
    2.5.4 Analog Outputs
    2.5.5 Serial
    2.5.6 RS-232
    2.5.7 RS-422
    2.5.8 RS-485
  2.6 Reliability and Other Considerations
    2.6.1 Durability
    2.6.2 Reliability
3.0 DISPLAYS, DATA RETRIEVAL, SOFTWARE
  3.1 Local Data Retrieval
    3.1.1 Overview
    3.1.2 The Corrector Index
    3.1.3 Local Display
    3.1.4 Site Download via Laptop or Hand-Held
           Terminal
  3.2 Remote Data Retrieval
    3.2.1 Communications Protocols
    3.2.2 Modem Hardware
    3.2.3 Communications Media
    3.2.4 Utility Industry End Device Data Tables
  3.3 Host Computer Systems
    3.3.1 Hardware Platforms
    3.3.2 Database Design
    3.3.3 Data Validation and Editing
    3.3.4 Reports and Analysis
    3.3.5 Alarm Processing
  3.4 Customer Access to Data
List of Electronic Corrector and Data Collection Host
System Manufacturers
References
Proposal to Revise Gas Measurement Manual - Electronic
                                            Corrector

Explains the basic features of electronic correctors for the purpose of evaluation, selection, installation, operation, calibration and maintenance.