MultiGas - Model LDS -Combustible Gas Sensors
Four or eight combustible gas sensors are installed at potential fuel gas leakage sites onboard a bus or truck (engine compartment, fuel tanks, piping/valving, inside cabin) to detect any measurable leakage of potentially explosive fuel gas. A compact cab-mounted operator display (5” x 3” x 1.4”) monitors the four sensors, and activates alarms if any sensor reaches a dangerous threshold. Voice messaging alerts operator audibly. The wide spectrum sensors respond properly to essentially any combustible gas, including CNG, LNG, LPG, methane, ethane, propane, butane and hydrogen, as well as gasoline. A selection of Spanish or other alarm voice message languages can be supplied.
The photo below shows the four gas sensors. If any of the four sensors indicates an elevated reading in excess of 20% of the lower explosive limit (or 1% methane equiv), a visual/audible alarm is activated and a spoken message ensues. The operator’s display shows which sensor is in alarm. The vehicle operator can silence the audible horn by pressing the acknowledge target on the touch-control screen, but the alarm notice continues lit until the alarming gas level drops below the alarm threshold. The operator’s touch screen display is installed within the driver’s reach and view, mounted to avoid contact with operator or occupants from abrupt vehicle movements. A gas-alarm relay is activated when any sensor is in alarm. This relay can be wired to activate external equipment such as existing communications, loggers, fuel system controls, engine ignition, and the like. Relay contacts are rated at 50VDC, 5A. An alarm override switch temporarily resets this alarm relay, and enabling the vehicle to continue operation to a safe stop for inspection and proper maintenance. The relays and analog inputs are located in the LDS Controller. The controller dimensions are 11”x7”x6”, usually installed out of sight. The stainless steel sensors with a -40F to +250F operating capability.
