Abbreviations & Glossary
The following abbreviations and technical terms are used throughout:
| bar | Unit of pressure approximately equivalent to 1 atmosphere |
| BEBS | Bell Emergency Battery System |
| CO2 | Carbon dioxide |
| DDC | Diver's Decompression Chamber |
| DMA | Danish Maritime Authority |
| DMS | Diver Monitoring System |
| DNV | Det Norske Veritas |
| DSV | Diving Support Vessel |
| EBC | Emergency Bell Communicator |
| EL | Entry Lock |
| FSL | Fathom Systems Ltd. |
| HMCS | Hyperbaric Monitoring & Control System |
| HRF | Hyperbaric Reception Facility |
| iAU | intelligent Acquisition Unit |
| iBIS | intelligent Bell Instrumentation System |
| iCG | intelligent Contents Gauge (bell onboard gas sensors) |
| iCR | intelligent Comms Router |
| iDI | intelligent Diving Instrument |
| iGA | Intelligent Gas Analyser |
| iNET | Fathom Systems proprietary communications protocol used in Analyser sub-systems |
| iPOA | intelligent Paramagnetic Oxygen Analyser |
| LARS | Launch and Recovery System |
| LC | Living Chamber |
| LED | Light Emitting Diode |
| LIM | Line Insulation Monitor (to monitor cable insulation) |
| LROS | Lloyd’s Register of Shipping |
| LSP | Life Support Package (equipment to provide power and communications during an emergency bell rescue) |
| LSS | Life Support Supervisor |
| LST | Life Support Technician |
| ML | Main Lock |
| MSW | Metres of Seawater |
| Mux | Multiplexer (equipment used to transfer multiple signals over a single data link) |
| NDIR | Non-dispersive Infrared (CO2 sensor technology) |
| O2 | Oxygen |
| PLC | Programmable Logic Controller |
| Pneumo | Depth measuring system using purging of gas from surface into an open-ended hose in the diver’s umbilical |
| pO2 | Percentage O2 |
| ppCO2 | Partial Pressure of CO2 |
| ppm | Parts per million |
| ppmCO2 | Parts per million of CO2 |
| ppO2 | Partial Pressure of O2 |
| PSI | Pounds per Square Inch |
| RHIB | Rigid Hull Inflatable Boat |
| ROCO | Rate of Change of … (e.g. depth) |
| RS232 | Serial data communications hardware protocol used to communicate to electronic devices |
| RS485 | Serial data communications hardware protocol used to communicate to electronic devices |
| SDC | Submersible Decompression Chamber |
| SE | Surface Equivalent (as used when measuring hyperbaric gas parameters at surface pressures) |
| SPHL | Self-Propelled Hyperbaric Lifeboat |
| TL | Transfer Lock |
| TUP | Transfer Under Pressure |
| TWC | Thru Water Communications |
| UDP | User Datagram Protocol (Type of network data communication) |
| UPS | Uninterruptible Power Supply |
| VFD | Vacuum Fluorescent Display |
