Which alloy is Wood's metal (Lipowitz alloy) used as a fusible link in some fire sprinkler heads?

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Pass the California Alarm Company Operator Exam. Study with flashcards and multiple choice questions, each with hints and explanations. Prepare for your exam with confidence!

Multiple Choice

Which alloy is Wood's metal (Lipowitz alloy) used as a fusible link in some fire sprinkler heads?

Explanation:
Sprinkler heads with a fusible link use a metal that melts at a specific, low temperature to release the valve when heat is reached. Wood's metal, also called Lipowitz alloy, is a fusible alloy chosen for this role because its melting point is relatively low (about 70°C / 158°F). When the surrounding temperature hits that point, the alloy melts and the sprinkler head activates, allowing water to flow. Tin solder melts at a much higher temperature, Bronze and Aluminum have even higher melting points, so they wouldn’t serve as reliable low-temperature fusible links for sprinkler heads. That’s why Wood's metal is the correct material.

Sprinkler heads with a fusible link use a metal that melts at a specific, low temperature to release the valve when heat is reached. Wood's metal, also called Lipowitz alloy, is a fusible alloy chosen for this role because its melting point is relatively low (about 70°C / 158°F). When the surrounding temperature hits that point, the alloy melts and the sprinkler head activates, allowing water to flow. Tin solder melts at a much higher temperature, Bronze and Aluminum have even higher melting points, so they wouldn’t serve as reliable low-temperature fusible links for sprinkler heads. That’s why Wood's metal is the correct material.

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