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