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Dual set point pressure SWICHGAGE® instruments for Lube
pressure protection of variable speed engines and transmissions.
Some diesel engines, notably Detroit Diesel, Cummins and some
marine transmissions, have a low oil pressure reading at idle speed relative to that at
rated speed. In variable speed applications an alarm or shutdown contact set low enough to
prevent nuisance alarm or shutdown at idle speed doesn't provide adequate oil pressure
protection at rated speed. Murphy's "ABS" option for the pressure
SWICHGAGE®
features 2-set points that provide the required protection by automatically switching the
contact set point according to the speed of the engine. Thus, the engine or transmission
is protected from low oil pressure situations at both running speed and idle speed at a
pressure setting which provides adequate lubrication.
Several devices can be used to sense engine speed and provide
the switching signal for the "ABS" option. The most accurate and easily
installed device is the SS100 speed switch. This speed switch can operate from either a
magnetic sensor or from the AC (tachometer) terminal of the battery charging alternator.
Wiring is shown below.
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