BENDIX SD-06-1600 Manuel D’Utilisation
1
Bendix
®
LP-2
™
& LP-3
™
Low Pressure Indicators
SD-06-1600
DESCRIPTION
The low pressure indicator is a safety device designed
to give an automatic warning to the driver whenever air
pressure in the air brake system is below the safe minimum
for normal vehicle operation. It is usually used to operate
an electrical buzzer or warning light, or both, which are
audible or visible to the driver.
to give an automatic warning to the driver whenever air
pressure in the air brake system is below the safe minimum
for normal vehicle operation. It is usually used to operate
an electrical buzzer or warning light, or both, which are
audible or visible to the driver.
Two styles of low pressure indicators are currently
manufactured.
manufactured.
The Bendix
®
LP-2
™
low pressure indicator, which is the
older style, consists of a die cast body with a spring loaded
diaphragm clamped between the body and the Bakelite
cover.
diaphragm clamped between the body and the Bakelite
cover.
The Bendix
®
LP-3
™
low pressure indicator is the newer
style. It consists of a die cast body, nylon cover and
employs a spring loaded o-ring diaphragm and piston. The
LP-3
LP-3
™
indicator is available with either one terminal or two.
The single terminal unit utilizes a metallic gasket between
body and case to ground the lower contact strip. The two
terminal unit utilizes a phenolic insulating gasket to isolate
both terminals from the vehicle frame.
body and case to ground the lower contact strip. The two
terminal unit utilizes a phenolic insulating gasket to isolate
both terminals from the vehicle frame.
The electrical contacts provided in both the LP-2
™
and
LP-3
™
indicators remain closed by spring force until the
air brake system pressure below the diaphragm is above
the setting (force) of the low pressure indicator spring. The
setting of the indicator and piece number is marked on a
label on the valve body. If a label is not present, then the
vehicle manual should be consulted for the proper setting.
The nominal setting of the indicator is 60 psi; however,
pressure settings may vary depending upon the vehicle.
the setting (force) of the low pressure indicator spring. The
setting of the indicator and piece number is marked on a
label on the valve body. If a label is not present, then the
vehicle manual should be consulted for the proper setting.
The nominal setting of the indicator is 60 psi; however,
pressure settings may vary depending upon the vehicle.
FIGURE 1 - BENDIX
®
LP-2
™
LOW PRESSURE INDICATOR
FIGURE 2 - BENDIX
®
LP-3
™
LOW PRESSURE INDICATOR
COVER
DIAPHRAGM
BODY
SPRING
CONTACT
POINTS
COVER
SPRING
CONTACT
POINTS
PISTON
BODY
O-RING
DIAPHRAGM