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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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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The logic control module (LCM) measures the level of waste in
the waste tank. The LCM stops the operation of the vacuum
waste system when the waste tank is full.
Location
The LCM is in the aft cargo compartment. You get access to the
LCM through the waste tank access panel on the left side of the
cargo compartment.
The LCM is above and forward of the waste tank.
Physical Description
The LCM has these features:
* Electrical connectors (4)
* Test switch
* Indicator lights (5).
Two of the electrical connectors are for the point level sensors.
One electrical connector is for the continuous level sensor. One
electrical connector is for the power and signal connections to
the airplane.
The test switch is a three-position (center off) momentary
switch. In the UP position (TEST SENSORS), the LCM starts a
power-up sequence which includes a full system BIT test. In the
DOWN position (TEST LAMPS), a test of the LEDs occurs. If the
test switch is held down for more than 10 seconds and the point
level sensors are disconnected, an auto zero adjustment of the
continuous level sensor will occur.
The five indicator lights are LEDs. These are the labels for the
LEDs:
* SENSOR J1
* SENSOR J2
* SENSOR J3
* TANK FULL
* POWER ON.
The SENSOR J1 and SENSOR J2 LEDs show the status of the
two point level sensors. The SENSOR J3 LED shows the status
of the continuous level sensor. The TANK FULL LED shows the
status of the waste tank and the LCM. The POWER ON LED
shows that system power is on.
The POWER ON LED is green. The other LEDs are red.
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Functional Description
The LCM gets data from the two point level sensors and the
continuous level sensor. The LCM uses the data from the
　
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