Fixed Gas Detection System

The sequential gas sample system is a multi point gas-sampling unit designed to detect andprovide alarms for the presence of flammable and hydrogen sulphide gases within the water ballast tanks and void spaces.The system is designed to extract a gas sample from each sample point via sample piping to the analyzing unit where the flammable and hydrogen sulphide gas content is measured. By using solenoid valves, the unit provides an effective way of sampling multiple locations using only one sensor for gas detection. The system utilities a heavy-duty sample pump to extract a sample of gas from each of the sample point locations. The extraction circuit incorporates a flow sensing device to annunciate a flow failure if the pump cease to operate or sample lines become blocked. Solenoid valves are used to select each sampling line for analysis in a sequential or pre-programmed sampling sequence. Furthermore, the system is extendable by adding additional valves, which are automatically recognised and activated. Flame arresters are installed on all sample lines in accordance with class regulations. The system can supply information to the vessels AMS system via a communications protocol which allows for a real time flow of information including the current location being sampled and the gas concentration level at this location.