制定确保所述数量的指南，主要目标是确保主要指示的完整性。为了达到不同的安全级别，制定了相关设备的设计、安装、使用和维护标准和建议。监管要求（包括安全方面的要求）并未详细说明，但包含了一些关于安全的一般警告说明，以供指导。

Establishes guidelines for ensuring the quantities stated, a main objective being to ensure the integrity of the primary indication. In order to achieve different levels of security, criteria and recommendations for the design, installation, use and maintenance of the relevant equipment are laid down. Regulatory requirements, including those for safety, are not specifically covered in detail but certain general cautionary notes on safety are included for guidance.