37
13.
APPROXIMATE VALUE OF MIST DENSITY
(1)
Mist density
1) The oil mist density is expressed as the weight (mg) of oil contained in 1 liter of air.
It has been experimentally verified that 50 mg/L is the lower explosion limit of oil mist.
2) The oil mist density of an engine considerably varies depending on the engine type and operating
conditions.
The specified “full-load setting” operation is performed to automatically set the sensitivity based on the
maximum mist density during normal operation.
3) The oil mist detector is provided to detect overheat of bearings that can cause explosion of the
crankcase at an early stage rather than to alert workers to the danger of the explosion.
Normally, the alarm can be given at 1.5 to 2.0% of the lower explosion limit density. The alarm is
given in the early stage when the mist density starts increasing abnormally from the oil mist density
during normal operation.
(2) Confirmation of mist density
The controller can indicate the mist density of 0 to 2 mg/L in the level of
｢
0
｣
to
｢
1023
｣
to inform you of
the approximately calculated oil mist density besides indicating the oil mist level.
Some types of controllers can directly indicate the mist density in mg/L.
[Digital value of density / mg/L converted value / temperature of sensor fitted] can be displayed as follows;
①
Press MODE key
②
1. Chose STATUS
③
1. Chose MIST/ALARM LEVEL
④
1. Chose MIST/ALARM LEVEL
：
Display the digital value
｢
Value
｣
×0.002=mg/L (Approximately)
2. Chose CONVERT TO
〔
MG/L
〕
：
Display the mg/L converted value
3. Chose TEMPERATURE
：
Display temperature of sensor fitted part
※④
Function 2,3 may not be displayed if the version of controller is old version.
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Issued to HORIZON TANKERS LIMITED S.A.
