Which fire detection system uses a single wire surrounded by a continuous string of ceramic beads in a tube?

The fire detection system characterized by a single wire surrounded by a continuous string of ceramic beads in a tube is known as a Heat Sensing Cable. This system operates on the principle of detecting temperature changes along the length of the cable. The ceramic beads serve as a thermal insulator and protect the wire, while the cable itself is designed to respond to heat that exceeds a predetermined threshold. When a significant temperature increase occurs, it can trigger a signal to alert operators to potential fire conditions.

In contrast, the Fenwal System typically utilizes a different approach, such as heat-sensitive elements designed to activate upon reaching specific temperature thresholds, yet does not employ the structure described in the question. Photoelectric systems focus on detecting smoke particles using light scattering methods and are unrelated to the wire and ceramic bead configuration. The Helios System uses advanced optical detection methods, specifically designed for detecting heat and smoke, but again does not include the structure mentioned.

Understanding how these systems operate allows for better recognition of their unique features and applications in fire detection, particularly the specific design and functionality of Heat Sensing Cables.