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The water quantity transmitter sends a voltage that is in
proportion to the level of water in the water tank. The logic in the
potable water module causes a specified number of LEDs to
come on. The number of LEDs on shows the level of water in the
tank.
The E (empty) LED light is on when power is available.
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Functional Description
The capacitance of the water tank level sensor changes when
the water level in the water tank changes.
The water quantity transmitter senses the capacitance of the
water tank level sensor and changes the capacitance input to a
0 to -10v dc output voltage. The output voltage of the water
quantity transmitter is in proportion to the quantity of water in
the water tank.
The potable water module on the attendant panel senses the
output voltage of the water quantity transmitter. The 0 to -10v dc
input voltage is changed to a digital signal and used to operate
an LED array. The LEDs in the array show as a continuous
display on the water quantity indicator. The water quantity
indicator shows water quantity as a percentage of full, with 1/8-
tank intervals.
Training Information Point
NOTE: The E (tank empty) LED on the water quantity indicator
will always be on when power is available.
NOTE: If the water tank is not correctly grounded, intermittent
operation of the water quantity indicator can occur.
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Purpose
The waste disposal system removes water from the lavatory
and galley sinks, human waste from the lavatory toilets, and
rain water from the door sills.
General Description
The waste disposal system has these subsystems:
* Gray water
* Vacuum waste
* Waste tank quantity indication.
Gray Water System
The gray water comes from the lavatory and galley sinks, and
from door sill drains at each entry and galley service door.
The gray water from the sinks drains overboard through drain
masts.
The gray water from the door sills drains overboard through
drain fittings.
Vacuum Waste System
The vacuum waste system removes human waste from the
toilets. The waste material is held in a waste tank until
servicing.
Waste Tank Quantity Indication System
The waste tank quantity indication system measures and shows
the level of waste in the waste tank.
Abbreviations and Acronyms
* ac - alternating current
* A/C - air conditioning
* BIT - built in test
* C - Celsius
* dc - direct current
* F - Fahrenheit
* FCU - flush control unit
* FWD - forward
* GND - ground
* LCM - logic control module
* mm - millimeter
* PSID - pounds per square inch differential
* REF - reference
* SEC - section
* SYS - system
* TYP - typical
* v - volts
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