A sprinkler with red liquid in the bulb would discharge at what temperature?

The presence of red liquid in the bulb of a sprinkler indicates that the sprinkler is designed to activate at a temperature of 155°F. This temperature rating is typically associated with standard sprinkler heads that use this specific color coding system to designate activation temperatures. The color coding helps both fire protection professionals and building managers quickly identify the appropriate response and understand the level of heat at which the sprinkler will operate.

For example, sprinkler heads that use a green liquid usually activate at 135°F, and those with a clear or amber liquid tend to have higher activation points, such as 200°F or 286°F. Thus, recognizing the correct activation temperature based on the color of the liquid in the bulb is essential for the proper installation and maintenance of fire protection systems, ensuring that they respond effectively in case of a fire.