If H2S exposure is anticipated, fixed monitoring devices aboard a MODU should have a low level concentration alarm to alert personnel. at what consentration level will the alarm activate?

Correct Answer: Option A — 10 PPM

Under 46 CFR 109.563 and offshore industry safety standards, fixed Hydrogen Sulfide (H2S) detection systems on Mobile Offshore Drilling Units (MODUs) must trigger a low-level concentration alarm at 10 PPM to warn personnel of dangerous toxic gas exposure before reaching hazardous levels.