Manifolds for gas cylinders must activate what type of signal to indicate changeover?

Manifolds for gas cylinders are designed to ensure a continuous supply of gas by managing multiple cylinders and facilitating a changeover when one cylinder is depleted or needs to be replaced. The operation of the manifold involves indicating when a changeover occurs, which is essential for maintaining reliable gas flow.

A local signal specifically refers to indications that are received and displayed near the manifold area. This type of signal allows immediate visibility for personnel working in the vicinity, ensuring that they are aware of the changeover status without needing to consult remote systems.

By activating a local signal, the manifold provides a clear and direct alert to those responsible for monitoring the gas supply, enabling prompt action if necessary. This is particularly important in medical settings, where uninterrupted gas supply is critical for patient care and safety. Thus, the correct answer highlights the specific function of the signal type that enhances operational efficiency and safety in managing gas cylinders.