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WATER/WASTE - WATER QUANTITY INDICATION SYSTEM - WATER QUANTITY TRANSMITTER
WATER/WASTE - WATER QUANTITY INDICATION SYSTEM - WATER QUANTITY TRANSMITTER
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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WATER/WASTE - WATER QUANTITY INDICATION SYSTEM - WATER QUANTITY TRANSMITTER
WATER/WASTE - WATER QUANTITY INDICATION SYSTEM - WATER QUANTITY TRANSMITTER
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The water quantity indicator shows the level of water in the
water tank.
Location
The water quantity indicator is a part of the potable water
module on the aft attendant panel. The aft attendant panel is a
part of the aft attendant station.
Physical Description
The water quantity indicator is an LED segment display. The
segments are from E (empty) to F (full), in increments of 1/8 of a
tank.
Functional Description
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.
WATER/WASTE - WATER QUANTITY INDICATION SYSTEM - WATER QUANTITY INDICATOR
EFFECTIVITY
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WATER/WASTE - WATER QUANTITY INDICATION SYSTEM - WATER QUANTITY INDICATOR
WATER/WASTE - WATER QUANTITY INDICATION SYSTEM - WATER QUANTITY INDICATOR
EFFECTIVITY
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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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EFFECTIVITY
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WATER/WASTE - WATER QUANTITY INDICATION SYSTEM - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The waste disposal system removes water from the lavatory
and galley sinks, human waste from the lavatory toilets, and
　
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