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* Tank not full (0v dc)
* Tank full (15v dc)
* Sensor fouled (1.83 Hz)
* BIT test results.
When the waste tank level is below a point level sensor, the
point level sensor sends a tank not full signal to the LCM.
When the waste tank level covers 50 percent of the face of a
point level sensor, the point level sensor sends a tank full signal
to the LCM.
The point level sensors can tell the difference between the
build-up of waste material on a point level sensor and a full
tank. A point-level sensor sends a sensor fouled signal to the
LCM when the build-up is more than 1/8-inch (3.2 mm). If the
build-up becomes more than 3/8-inch (9.5 mm), the point level
sensor sends a tank full signal to the LCM.
When a system BIT input signal is received from the LCM, the
point level sensor starts BIT. If the point level sensor passes the
BIT tests, a 0.0v dc signal goes to the LCM. If the point level
sensor fails the BIT tests, a 1.83 Hz signal goes to the LCM.
Training Information Point
The point level sensors sense changes in the level of the waste
tank by changes in capacitance. The waste tank must be
grounded to the airplane structure for the point level sensors to
accurately sense the waste tank level changes.
When a point level sensor is fouled, a sensor fouled signal goes
to the LCM. The sensor fouled signal causes these indications:
* Related SENSOR J1 or SENSOR J2 light on the LCM flashes
* CLEAN/CHECK SENSOR light on the attendant panel comes
on
* Waste material on the sensor is greater than 3/8 inch.
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The sensor fouled signal continues until one of these conditions
occur:
* Waste material is no longer on the point level sensor surface
* Level of waste in the tank covers the sensor(s).
If the SENSOR J1 or SENSOR J2 light continues to flash after a
rinse, it may be necessary to remove the sensor to clean it.
CAUTION: USE EXTREME CARE TO AVOID DAMAGE TO THE
FACE OF THE POINT LEVEL SENSOR.
SCRATCHES OR DAMAGE CAN CAUSE A
FAILURE OF THE POINT LEVEL SENSOR.
Use a soft bristle brush and soap to clean the face of the point
level sensor.
WATER/WASTE - WASTE TANK QUANTITY INDICATION SYSTEM - POINT LEVEL SENSOR
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38-33-00-002
WATER/WASTE - WASTE TANK QUANTITY INDICATION SYSTEM - POINT LEVEL SENSOR
WATER/WASTE - WASTE TANK QUANTITY INDICATION SYSTEM - POINT LEVEL SENSOR
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
38-33-00-002
Purpose
The continuous level sensor measures the level of waste
material in the waste tank.
Location
The continuous level sensor is in the aft cargo compartment.
You get access to the continuous level sensor through the
waste tank access panel on the left side of the cargo
compartment.
The sensor module connects to the drain line at the forward
lower end of the waste tank. The remote diaphragm connects to
the vacuum line at the forward upper end of the waste tank.
Physical Description
The continuous level sensor is a capacitance-type pressure
sensor. The sensor has these parts:
* Remote diaphragm
* Sensor module
* Capillary tube.
The capillary tube connects the remote diaphragm to the sensor
module. The sensor module connects to the logic control
module (LCM).
Functional Description
The sensor module measures the liquid (head) pressure at the
bottom of the waste tank. The remote diaphragm measures the
pressure of the air in the waste tank. The pressure transmits
through the oil-filled capillary tube to the sensor module. The
sensor module finds the difference between the air pressure in
the waste tank and the liquid pressure in the drain line. The
sensor uses the difference to calculate the level of waste in the
waste tank. The output signal goes to the LCM.
Training Information Point
CAUTION: DO NOT BEND THE CAPILLARY TUBE OF THE
CONTINUOUS LEVEL SENSOR TO LESS THAN A 3-
INCH RADIUS. SHARP BENDS CAN CAUSE
DAMAGE TO THE CAPILLARY TUBE.
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