Level alarm system – OAS 5.5

Independent high level and overfill monitoring system


Since 2018, FOSSTECH AS has the rights to produce and sell Omicron Level Alarm Systems (OAS), including High Level & Overfill sensors. Read more on www.fosstech.no


Our high level / overfill alarm system is the classical product in the Omicron range. Ever since the first system was delivered in 1989 we have continuously improved and optimized the system to the robust, market leading design of today. The OAS 5 is designed to monitor all pumpable liquid cargo types as an independent alarm system as required by IMO’s “International Code for Construction and Equipment of Ships carrying Dangerous Chemicals in Bulk” (IBC Code) as well as classification societies rules for chemical, oil product and gas carriers.

Each system is specified in line with the individual customer’s needs and contains a monitoring cabinet and a sensing element, optimized for the various cargo types and able to withstand the most demanding maritime conditions.


  • Preconfigured 1 to 3 alarm level thresholds
  • Suitable for all pumpable liquid cargo types
  • Resistant to tank cleaning machines
  • Application specific sensor types, e.g. LNG / LPG
  • Same alarm point for different cargo densities
  • Alarm hold function, avoiding repeating alarms from same sensor
  • Fail safe, fully encapsulated design
  • Intrinsically safe connections to sensors
  • Mechanically and electrically separated high level and overfill alarms
  • No active electronic components in the open deck area
  • Alarm panel in electronic cabinet or remote
  • Connectable to external alarm / control system
  • Manual sensor / system test functionality
  • Continuous system verification
  • At sea mode, adjusting for ship movements (Optional)
  • Remote control with control transfer (Optional)