What temperature does a yellow sprinkler bulb activate at?

The yellow sprinkler bulb activates at a temperature of 79 °C (or 175 °F). In the context of sprinkler systems, the color of the bulb signifies the temperature at which the sprinkler will activate to release water in the event of a fire. The yellow color indicates that this particular bulb is designed for use in environments where moderate heat may be present, which requires a slightly elevated activation temperature compared to standard bulbs.

Understanding the activation temperatures of sprinkler bulbs is critical for ensuring that fire suppression systems are effective in various environments. Different colors correspond to different activation temperatures, and it is essential for designers and installers to select bulbs that are appropriate for the specific conditions of the area they are protecting. This ensures timely activation in response to fire conditions, optimizing safety and minimizing damage.