Gas Monitor
Total Analytical Solution 
D-2-4, Setia Walk, Pusat Bandar Puchong,
47160 Puchong, Selangor, Malaysia
Tel: + 6012-921 3877; 603-5879 7121
Fax: +018 635 1593
   Home      Analox- Hyper Gas MkII Hydrocarbon Analyser

Hyper-Gas MkII Hydrocarbon Analyser


Hyper-Gas MkII training.

Analox recommend that all new or existing users of the Hyper-Gas MkII™ analyser attend an official certified training course to understand the dangers that hydrocarbons pose to commercial divers and to learn to operate, maintain and trouble shoot to ensure diving operations are not interrupted and that this vital piece of safety equipment is helping to protect the divers.

The course lasts approx 3-4 hours and is aimed at Life Support Supervisors, Assistant Life Support Technicians, Life Support Technicians, Equipment Managers, Health & Safety Managers, Compliance Managers, Asset Managers, Commercial Divers, Bell Supervisors and indeed anyone involved in the diving operation, particularly dive control.

The course covers the following main areas and includes lunch:-

  • Overview of Analox Sensor Technology
  • Tour of Analox facility (only when hosted at Analox, UK)
  • Dangers of hydrocarbons
  • Hyper-Gas inception
  • Hyper-Gas adoption
  • Infrared sensing technology
  • Installation
  • Maintenance
  • Manifold removal
  • Calibration
  • Alarm checks
  • Trouble shooting
  • Datalogging
  • Common misconceptions
  • How not to treat the Hyper-gas
  • Quiz
  • Questions/Certification

Diver safety

The Hyper-Gas MkII™ is designed to detect and warn divers of, potentially fatal, anaesthetic levels of hydrocarbons in the diving bell. Where divers are working on dirty sites, there is a likelihood for contamination of the bell atmosphere from vapourisation of contaminants carried on dive suits and umbilical lines, even when divers are wearing additional safety dive suits. Vapourisation of hydrocarbons into the bell can occur within minutes and can rapidly rise to anaesthetic concentrations.

Real dangers to divers

In the presence of anaesthetic levels of volatiles divers can suffer the effects within a few breaths. Even before unconsciousness, the ability to react normally becomes impaired. The effects caused by sub anaesthetic levels can be compared with the pattern of behaviour caused by alcohol consumption.

The following effects have been detailed by Fang et al. (1996);

  • 33% of the anaesthetic level of toluene leads to hyperactivity.
  • 13% of the anaesthetic level of xylene causes tremors which could impair purposeful actions.
  • 44% of the anaesthetic level of benzene causes uncontrolled jerking of limbs.
  • 52% of the anaesthetic level of cyclo-hexane causes convulsions.

How it works

The Hyper-Gas MkII™ comprises;

  • Bell monitor; once mounted inside the bell, the monitor will rapidly detect the presence of vapourised hydrocarbons, and will activate audible and visual alarms before the anaesthetic threshold is reached.
  • Topside repeater, mounted at the surface the topside repeater mimics the conditions inside the bell.


The Hyper-Gas MkII™ system has been designed to operate to depths up to 60 Bar A. It uses a unique hyperbaric hydrocarbon sensor based on highly respected Analox infra red technology. The sensor is sensitive to a range of hydrocarbons, and is able to detect all those commonly given off by the vapourisation of crude oil or condensate.

Topside engineer checking topside repeater unit automatic correction of pressure and temperature effects ensures the analyser will offer optimum performance in this difficult environment.

Gas alarm

The gas alarm level is preset to 10% of the anaesthetic dose of vapourised hydrocarbons that could be present in the diving bell. The sensor gives an additive response to the range of hydrocarbons normally present, not one individual compound. For diving in areas where contamination is known to be from 1 or 2 compounds, an alternative alarm set point could be calculated by Analox

Response time

The sensor needs to be mounted within the diving bell, rather than relying on an umbilical fed analyser because anaesthesia, or the effects of sub anaesthetic levels can occur within a few breaths, i.e. a few seconds. By analysing for hydrocarbons at the surface its likely that the effects would occur before an alarm is raised. A rapid response is crucial. The Hyper-Gas MkII™ has been designed with an internal sample pump to ensure a fast response to hydrocarbons.


The Hyper-Gas MkII™ system is fitted with a factory set datalogging facility. This logs and measured levels of hydrocarbons, the depth and the corresponding data and time. Once the datalogging capacity is exceeded the Hyper-Gas MkII™ will automatically overwrite the oldest data. Data can be downloaded via the topside repeater or bell monitor onto a PC, using the data communications cable, and the datalog retrieval programme.

Analox in diving

Analox have been supplying gas analysers into the diving industry for over 20 years. We are an acknowledged authority in the design and manufacture of gas monitoring instrumentation across all sectors of the industry, from sports & leisure diving through to military systems.

We are recognised as being a specialist in Hyperbaric Chamber monitoring, and the only company capable of developing this type of detection system in joint collaboration with Unimed Scientific Limited.

Unimed Scientific Ltd

This is why the UK Health & Safety Executive, UK offshore Operators Association & the major Dive Companies asked Analox to develop the Hyper-Gas MkII™ system.


Industry adoption of the Hyper-Gas MkII™

Since its launch in 2006, the Hyper-Gas MkII™ has been adopted by many diving contractors around the world in line with their own health and safety protocol and is currently installed in a host of diving bells operating internationally. Several commercial diving organisations and oil & gas majors also recommend or mandate the use of this unique system in their own codes of practice. Others are now considering the Hyper-Gas MkII™ inclusion in revisions of their guidelines. The industry adoption demonstrates how important such a unit is in helping to ensure the highest level of safety is delivered to commercial divers who regularly dive to depths of over 200 metres.


The Association of Oil & Gas Producers

In this code of practice, the Hyper-Gas MkII™ is required to be used by any contractor undertaking saturation diving for an OGP member.

Det Norske Veritas (DNV)

In DNV's Offshore Standard 'DNV-05-E402', section 4, sub section E601 there is a guidance note describing the potential need for analysis of hydrocarbon gases in connection with the exploration of oil

BP, Shell & Total

Each of these oil and gas majors stipulates that the Hyper-Gas MkII™ must be used by any contractor undertaking saturation diving operations for them.

D-2-4, Setia Walk, Pusat Bandar Puchong,
47160 Puchong, Selangor, Malaysia

Tel: + 6012-921 3877; 603-5879 7121
Fax: +018 635 1593