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103. Which instrument is suitable for determining the presence of explosive concentrations of fuel oil vapors in tanks?
A combustible gas indicator is the correct instrument for detecting explosive fuel oil vapor concentrations because it directly measures flammable vapor levels in air, typically expressed as a percentage of the lower explosive limit. Liquid cargo meters measure liquid quantity, flame safety lamps are unsuitable for this purpose, and therefore, only a combustible gas indicator fulfills the requirement.
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