What are the PID (VOC) alarm setpoints?

What are the PID (VOC) alarm setpoints?

• A. Low 100; High 200
• B. Low 25; High 75
• C. Low 50; High 100
• D. Low 60; High 120

Answer: (C)

In a PID VOC monitor, you typically configure two alarm levels to manage risk: a low alarm for early warning and a high alarm for immediate action. The pair of setpoints at 50 and 100 creates a clear escalation. The low threshold at 50 gives advance notice as concentrations rise, so operators have time to investigate, ventilate, or take precautions before the situation worsens. The high threshold at 100 then triggers urgent actions or evacuation if needed, preventing exposure from reaching hazardous levels. This spacing helps balance sensitivity with reliability, avoiding nuisance alarms that would occur if the low threshold were set too high and preventing delayed response if the high threshold were set too low. In practice, these values are often expressed in ppm, aligning with common VOC reporting on PID instruments, though the exact units depend on the instrument’s configuration.

In a PID VOC monitor, you typically configure two alarm levels to manage risk: a low alarm for early warning and a high alarm for immediate action. The pair of setpoints at 50 and 100 creates a clear escalation. The low threshold at 50 gives advance notice as concentrations rise, so operators have time to investigate, ventilate, or take precautions before the situation worsens. The high threshold at 100 then triggers urgent actions or evacuation if needed, preventing exposure from reaching hazardous levels. This spacing helps balance sensitivity with reliability, avoiding nuisance alarms that would occur if the low threshold were set too high and preventing delayed response if the high threshold were set too low. In practice, these values are often expressed in ppm, aligning with common VOC reporting on PID instruments, though the exact units depend on the instrument’s configuration.