Which temperature classification corresponds to a sprinkler head with a purple glass bulb?

The classification corresponding to a sprinkler head with a purple glass bulb is deemed "Extra High." This classification indicates that the sprinkler is designed to activate at a higher temperature than other types, making it suitable for environments that may experience elevated heat conditions.

In the context of sprinkler systems, the color coding of the glass bulbs is significant for identifying the activation temperatures quickly. Purple typically denotes a temperature rating of 165°F (74°C) or higher, aligning with the requirements of extra high-temperature environments. This classification helps ensure that sprinkler systems function effectively in various conditions, ultimately maintaining safety and fire protection standards.

Understanding temperature classifications is vital for sprinkler fitters as it informs their choice of equipment based on the specific needs of the installation site, helping to ensure compliance with safety codes and effective fire suppression capabilities.