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* mm - millimeter
* REF - reference
* TYP - typical
* v - volts
WATER/WASTE - WASTE TANK QUANTITY INDICATION SYSTEM - INTRODUCTION
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WATER/WASTE - WASTE TANK QUANTITY INDICATION SYSTEM - INTRODUCTION
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Purpose
The point level sensor gives a signal to the logic control module
(LCM) when the waste tank is full.
Location
There are two point level sensors in the aft cargo compartment.
You remove the waste tank access panel to get access to the
point level sensors. The point level sensors are on the center
inboard side of the waste tank.
Physical Description
The point level sensor is a capacitance type sensor. It has a
sensor face and an electrical connector.
Functional Description
The LCM supplies 15v dc power to the point level sensors. The
point level sensors supply these signals to the LCM:
* 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.
WATER/WASTE - WASTE TANK QUANTITY INDICATION SYSTEM - POINT LEVEL SENSOR
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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.
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WATER/WASTE - WASTE TANK QUANTITY INDICATION SYSTEM - POINT LEVEL SENSOR
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