Final answer:
The maximum alarm set point for an ammonia vapor detector can vary depending on the specific device and its application. However, in many cases, a common threshold for activating an alarm in the presence of ammonia is 25 parts per million (ppm).
Given the options provided:
A) 30 ppm
Step-by-step explanation:
The maximum alarm set point for an ammonia vapour detector varies depending on the guidelines provided by occupational health and safety regulations in different jurisdictions.
However, a commonly accepted standard is 25 ppm (parts per million) for an initial alarm level, with higher levels requiring evacuation or the implementation of emergency procedures. An alarm set point should be well below any levels that might pose an immediate threat to life or health.
Therefore, the options provided (30 ppm, 150 ppm, 300 ppm, and 450 ppm) do not accurately reflect the general safety standards, as 25 ppm is typically the set point for an initial alarm. It is important to adhere to the specific requirements and recommendations of the country and to consult the material safety data sheet (MSDS) or safety standards such as those from OSHA (Occupational Safety and Health Administration) or other relevant workplace health and safety agencies.