Question 741 Deck Safety

70% to pass

If the meter needle of the oxygen indicator cannot be set to zero, what should be done?

A Adjust the final reading by the amount the needle is displaced from zero.
B Replace the platinum filament.
C Replace the batteries.
D Check the sampling tube for blockage.
AI Explanation

The correct answer is C) Replace the batteries. If the meter needle of the oxygen indicator cannot be set to zero, this typically indicates an issue with the power supply or batteries powering the device. The oxygen indicator relies on a stable power source to provide accurate readings. If the batteries are low or failing, it can cause the needle to be unable to properly calibrate to zero. Replacing the batteries is the appropriate step to resolve this issue and restore the oxygen indicator to proper working order. The other options, such as adjusting the reading or checking for blockages, do not address the root cause of the problem, which is the power supply.

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Official Resources
46 CFR Lifesaving Equipment USCG Marine Safety Center USCG National Maritime Center
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