Operating Principle of the Infrared instrument: identify the key principle that leads to detection of hydrocarbon gas,
Direct Answer
Option D: When there is combustible gas present, there is a predictable drop in the output from measurement signal detector because the gas is absorbing light.
Infrared gas detectors operate on the principle that hydrocarbon gases absorb specific infrared wavelengths. When combustible gas is present, it absorbs the IR light, causing a predictable drop in the measurement signal detector's output. This reduction is directly proportional to the gas concentration, enabling accurate detection for safety, as per ISGOTT guidelines.
All Options
Detailed Explanation & Context
Infrared gas detectors operate on the principle that hydrocarbon gases absorb specific infrared wavelengths. When combustible gas is present, it absorbs the IR light, causing a predictable drop in the measurement signal detector's output. This reduction is directly proportional to the gas concentration, enabling accurate detection for safety, as per ISGOTT guidelines.
Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • Advanced Training for Chemical Tanker Cargo Operations (CHEMCO).
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