Routine Atmosphere Monitoring

As a supplier of bespoke solutions for submarine atmosphere monitoring we understand the complexities of the environment in terms of pressure, temperature and humidity variations. Requirements may vary between types of submarine and different solutions are offered for diesel electric, air-independent propulsion (AIP) and nuclear boats.

Monitoring systems typically incorporate one or more of the following technologies:

Analox Military Systems understands these issues and can offer a number of fixed and portable monitoring solutions, or a tailored bespoke design service.

Centralised atmosphere analyser

 A centralised atmosphere analyser (AA) monitors up to 30 gases from various locations—this is ideal for nuclear boats (and potentially AIP boats) which need to sample a large number of gases at low concentrations. An AA is typically installed in a central location and connected to sample lines which pull samples from different compartments around the boat. 
Up to 3 AA units can be connected together to provide system redundancy. A centralised AA provides real-time continuous monitoring of life support gases and trace gases. Sampling occurs automatically but can be over-ridden to sample a specific compartment. A range of standard gases is continually monitored and displayed, including O2, CO2, CO, H2 and refrigerant gases such as R134a. Non-standard gases are also continually monitored, but generally only displayed on request, These include methanol, hydrogen cyanide, hydrogen chloride, oxides of nitrogen, sulphur dioxide and specific hydrocarbons. Submarine pressure is also monitored.

Distributed sensor network

A distributed sensor network comprises a centrally located PLC user interface linked to discrete gas sensors  or sensor modules located around the boat. Typical gases monitored include O2, CO2, CO, H2, in addition to refrigerant gases and submarine pressure and humidity. This system is ideal for diesel boats (and potentially AIP boats) which need to monitor the life-support gases but which may have limited space. It is ideal for MPC60 and 24-hour limits.
The main benefits of the distributed sensor network are:

Carbon monoxide monitoring

CO monitoring in the submarine environment requires a different technology than that used in off-the-shelf carbon monoxide detectors. Standard electrochemical sensors are extremely cross-sensitive to hydrogen,  making them unsuitable for use in the submarine environment. AMS’s solution for routine CO monitoring 
As a result, Analox Military's Solution for routine CO monitoring (COSAMS) uses a selective infra-red sensor which eliminates cross sensitivity to other gases likely to occur within the submarine atmosphere.

Portable gas monitors

Portable monitors are typically used as an emergency backup to the primary atmosphere analyser or for confined space entry. In collaboration with our customers, Analox Military Systems has found the Sub Aspida (dual O2/CO2) and the HYP (partial pressure O2 monitor) to be a cost-effective alternative to colorimetric tubes.