GAS DETECTION SYSTEM FOR BALLAST
TANKS AND VOID SPACES
TYPE OGS 3.1


OGS 3.1 can be delivered in two basic versions; Split or Combined. In a Split version all mechanical and pneumatic components are mounted in a Detector Cabinet. Operator Panel is mounted in a separate cabinet, including power control components. It can also be mounted in an external console (these two versions will avoid noise from pneumatic components in control room on ships). In a Combined version the Operator Panel is mounted on the Detector Cabinet door. This version requires an additional Interface- and Power control cabinet. This version is
prepared for compact installations and central instrument rooms on FPSOs etc.

• The system fulfils latest requirements
from IACS, EC, IMO and all major classification societies’
rules and regulations.

Wheelmark approved

OMICRON Gas System OGS 3.1 is the 4th generation, fully computerised gas sampling system developed by OMICRON.

OGS 3.1 is for permanent installation. Different models and options cover most applications you will find onboard tankers. All Delivered parts are completely assembled ready for interconnection to on site application. OGS 3.1 is based
on a scanning method, which means that sample points are being connected to a sensor in a cyclic sequence. The operator panel has LCD display and individual LED lamps indicating each measuring point status. To minimize scanning cycle time and guarantee fresh samples at all times, the system has two sample
pumps. One main pump, taking samples from all sample points continuously and a smaller sample pump taking samples from the actual point according to the sequence. This secures quick response if gas is detected. Due to dual pump layout the system will continuously monitor all pneumatic components in the cabinet against malfunction. All types of malfunctions including leakage will be detected and alarmed. Automatic purging of sample line immediately after each sampling is finished.

Standard features:
• Infrared hydrocarbon sensor with range 0 - 100 % L.E.L.
• Low and high gas level alarms.
• Flame arrestor and shut-off valve for each sampling tube.
• Automatic and sequential purging of each sampling tube.
• Semi-automatic test facility for zero and span.
• Manual disconnecting of sampling points not in use (e.g. when water in ballast tanks).
• Two sampling pumps (main and sample).
• Non-return valves in ballast tanks in order to avoid liquid entering into the system.
• Extensive hardware and software system monitoring.

Options:
• Repeater Display units. Up to 5 addition units with Master control transfer function.
• Remote alarm unit. Simple alarm status panel with LEDs and buzzer (e.g. for Bridge)
• Aux. relay outputs. Up to 32 relay outputs, freely configurable to any sample point.
• St.By pump layout. This option will have extra set of pumps with manual switch over.
• Multiple flow sensors (option). Main/bypass flow. Used for special layouts (LNG etc.).
• Dual purge supply (E.g. Nitrogen and instrument air).
• Multi-gas analysing. Up to 3 different gas sensors can be installed.
• Alarm printer.
• Bulkhead penetrations.
• Automatic disconnection of sample line when sample point is manually disconnected
from scanning cycle.
• Single/Dual RS 485/422 ModBus RTU serial line output to external computer.
• Custom made systems on request.

Specifications:
Number of gas sampling points .. Max. 48
Purge air supply ............................. 7 bar
Power supply .................................. 230V AC Nom. Max. 1200W
Alarm for clogged tubes ............... Yes
Calibration gas ................................. Included
Serial line communication ............. RS 485/422 (RTU MODBUS)
Sample/purge time range ............. 25 s - 9999 s