2.5
To minimize the danger of fire and explosive discharge within the tanks on petroleum
carrying vessels, the U.S. Coast Guard has specified that the gaseous environment abo
ethe fluid levels in petroleum cargo tanks be maintained with sufficient inert gas to
reduce oxygen levels below an 8% level.
2.6
A single 9-volt battery contained within the hub assembly powers the oxygen sensor tape
and sensor assembly. Battery drain is extremely low, (approximately 0.75 milli-amperes),
and if the unit is left unattended in the air for more than approximately 5 minutes, power
is automatically shut off. Low battery warning is provided at the upper left corner of the
LCD when the battery voltage has dropped to a level that would, with further operation,
cause erroneous oxygen readings.
4
