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:
- centralised atmosphere analyser
- distributed sensor network
- carbon monoxide detectors
- CO, O2, CO2 and refrigerant gas detectors
- portable backup and emergency analysers
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 which need to sample a large number of gases at low concentrations. An AA is typically installed in a central location and connected to remote sensor units in different locations around the boat.
Multiple analysers 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 which need to monitor the life-support gases but which may have limited space. It is ideal for MPC60 and 24-hour limits.
A distributed sensor network offers: flexible system architecture, sensors located in the area where the gas poses a direct risk and speed/simplicity of calibration and maintenance.
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 of the submarine atmosphere is the COSAMS unit (carbon monoxide submarine atmosphere monitoring system).
Portable gas monitors
Portable monitors may be used as an emergency backup to a main atmosphere analyser or for specific uses such as confined space entry.The Sub Aspida is a dual O2/CO2 portable monitor for routine monitoring of the submarine atmosphere, and the HYP monitors for partial pressure of oxygen.