DEFENSE DIVING

Oxygen is one of the most critical parameters to monitor on any dive system, it is vital the divers receive the correct partial pressure (pp) of O2 in order to live and work comfortably while in saturation. Analox offers two O2 sensing technologies for the SDA:

• The electrochemical sensor version uses Analox’s state-of-the-art digital MEC electrochemical sensor to provide oxygen readings. It is normally located in Sat/Dive Control; the sensors can be located at the panel or in the chamber/bell. The SDA O2 is compliant with DNV, IMCA, Lloyds, ABS, and ADCi requirements
  
• The paramagnetic O2 sensor uses Analox’s state-of-the-art digital paramagnetic O2 sensor to offer enhanced accuracy when monitoring low concentrations of O2

Either version can be used for monitoring O2 concentrations in the:

• Decompression chamber
• Diving bell
• O2 delivered to divers through the umbilical
• O2 added to helium reclaim systems

As a by-product of human metabolism CO2 should be carefully monitored in any dive system. The SDA CO2 is compliant with DNV, IMCA, Lloyds, ABS, and ADCi requirements. Carbon dioxide readings are taken from a fast response, accurate, dual-beam infra-red sensor, called the ‘Analox 5S3’. It is normally located in Sat/Dive Control, however if hyperbaric CO2 monitoring is required Analox would offer their unique SDA HYP O2/CO2, based on 30 years of experience in hyperbaric gas sensing.

Diving chamber depth readings are used in combination with gas readings to calculate the partial pressures and thereby ensure the safety of divers. The accuracy offered by the SDA Depth is compliant with DNV, IMCA, Lloyds, ABS, and ADCi specifications. The SDA Depth display unit is normally located in Sat/Dive Control and its pressure sensor is mounted in the hyperbaric environment.

Carbon monoxide is highly toxic and can be tolerated only at very low levels in a dive system. CO can enter the dive system through a compressor; it could also be present in the delivered gas and metabolized by the diver in the chamber during operations. The SDA CO provides readings from a fast response, accurate, long-life digital electrochemical sensor. The SDA CO can be located either in Sat/Dive Control or at the compressor. For more accurate NORSOK & EH75/2 monitoring of CO, Analox offers the SDA CO+.

The SDA CO+ offers increased accuracy over the SDA CO by incorporating an advanced electrochemical cell which measures CO in parts per billion (ppb) instead of parts per million (ppm). The SDA CO+ complies with NORSOK 4–100, EH75/2 and BS8478 standards and can be located in the Sat/Dive Control or compressor.

Helium is an expensive gas which is routinely salvaged from breathing air systems. Monitoring the purity of heliox in a reclaim system can improve both cost efficiency and diver safety. The SDA He is normally located in a helium reclaim area and used in conjunction with an SDA O2, which has the networking option selected.