4-66. TANKS AND VOIDS - MAINTENANCE INSTRUCTIONS.
The arrangement of transmitters within the tank provides the generation of a level signal, the
voltage amplitude of which is proportional to the level of the fluid being measured. The level signal is
connected to the level indication circuit in the receiver. The level indication circuit processes the level signal to
the signal for amplitude variations that result from the sloshing of the fluid level in the tank, rather than from
changes in the actual level. A slosh-dampened meter signal that results from this processing is applied to a
fluid level meter on the receiver.
Each alarm circuit, whether high or low, compares the amplitude of the fluid level signal with the
amplitude of a preselected, adjustable internally generated threshold signal. The threshold signal establishes
the value above which a high alarm circuit establishes an alarm condition or below which a low alarm circuit
establishes an alarm condition. Establishing an alarm condition develops an applicable high or low alarm
signal. The high and low alarm signal energize a lamp on the receiver panel.
The voltages used for the operation of the circuits described above are generated in power
distribution circuits. The power distribution circuits produce a-c and d-c potentials by processing 115-volt, 60
Herz (Hz) ac ship's power.
The following is a list of maintenance procedures.
Tank Level Indication Receiver