NF EN ISO 6551 : 1996

National foreword
Committees responsible
Recommendations
0. Introduction
1. Scope and field of application
2. Definitions
3. Levels of security
4. System design principles and quality
5. Precautions
6. Installation
7. Commissioning and testing
8. Inspection and maintenance
Figures
1. Typical functional arrangement for pulse security
    system; Level E
2. Typical functional arrangement for pulse security
    system; Level D
3. Typical functional arrangement for pulse security
    system; Level C
4. Typical functional arrangement for pulse security
    system; Level B
5. typical functional arrangement for pulse security
    system; Level A

Gives guidelines for ensuring the fidelity and security of pulsed data cables transmission systems for the metering of fluids to ensure the integrity of the primary indication. Includes precautions, installation, commissioning and testing, inspection and maintenance. Illustrates typical functional arrangement for pulse security system, level A - E.