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FIXED ALARM PANELS - APM-2

Operation of the APM-2 Audio/Visual Annunciator (continued)

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    Panel operation is as follows.

    When liquid level reaches 95% capacity in a cargo compartment, the high level sensor reed switch protecting that compartment opens, breaking the intrinsically safe sensing loop from its corresponding 9251/02 repeater relay. This relay turns on the amber High Level Alarm light showing which specific compartment has the 95% full condition. Simultaneously, the top mounted yellow strobe light begins to flash and the high level audible signal sounds. After an adjustable time period of approximately 5 seconds, the amber strobe light and high level audible signal will shut off, yet the amber individual compartment High Level indicator light will remain lighted. When the first high level condition is achieved, the High Level series loop of dry panel contacts feeding pins L3 and N of the Hubbell 516B-IW Barge to Shore Receptacles open. If the barge is connected to a dock facility, which can accept this signal, the dock will immediately be aware of the High Level condition. In turn, each subsequent high level condition will be annunciated as describe above.

    In the event liquid level reaches 98% capacity, simultaneously the individual compartment red overfill light will light, the red strobe light will light, the overfill audible alarm will sound and the barge to shore connection circuit indicating overfill alarm will open at pins L1 and L2, alerting the dock facility of the overfill condition if the facility has provisions to accept this signal. All of these system conditions remain until liquid level is reduced or the annunciator panel power switch is turned off. With panel power switched "off" or if the battery power fails, both High Level and Overfill conditions will be indicated at the barge to shore connection receptacles. If the annunciator panel power switch is "on" and battery power drops too low, to a value of approximately 20 VDC, the red low power warning light will come on and the barge to shore connection will indicate both High Level and Overfill conditions.

    During pre-transfer overfill system testing as required in 46 CFR 39.20(b)3, all system components are fully tested. During this system test, battery supply voltage is clearly 0-21 indicated and if supply voltage is less than 21 VDC, the two series connected 12 VDC gel cell batteries must be recharged or replaced with fully charged batteries. Approximately 50 hours of panel operation can be expected from a fully charged battery set. As an option, solar modules can be provided to recharge the batteries on the barge making the power supply maintenance free.