Which statement about the H2S detector system is true?

• A. It has four detector heads
• B. It can interface with an alarm SWBD
• C. It uses six detector heads
• D. It has no audible alarms

Answer: (B)

The important point is that H2S detector systems are designed not just to sense gas, but to alert people and trigger safety actions. A detector system that can interface with an alarm switchboard (SWBD) provides centralized annunciation and coordination of alarms, so when hydrogen sulfide is detected, audible alarms, visual indicators, and potentially automatic safety responses (like ventilation) can be activated and monitored from a control point. This capability is essential for fast, organized response in an hazardous environment.

Having a specific fixed number of detector heads is not a universal defining feature; systems vary in how many heads they use to cover different areas. And a system without audible alarms would not meet the safety needs of H2S detection, since audible alerts are a key way to warn personnel quickly. Thus, the ability to interface with an alarm SWBD best describes a functional and safety-focused aspect of the detector system.