2.1 Water level detector means a system comprising sensors and alarms that detect
and warn of water ingress in cargo holds and other spaces as required in SOLAS
regulations II-1/25, II-1/25-1 or XII/12.1.
2.2 Sensor means a unit fitted at the location being monitored that activates a
signal to identify the presence of water at the location.
2.3 Pre-alarm level means the lower level at which the sensor(s) in the cargo
hold space will operate.
2.4 Main alarm level means the higher level at which the sensor(s) in the cargo
hold space will operate or the sole level in spaces other than cargo holds.
2.5 Visual indication means indication by activation of a light or other device
that is visible to the human eye in all levels of light or dark at the location where it
is situated.
2.6 Audible indication means an audible signal that is detectable at the location
where it is signalled.