Abstract: A smoke density monitor for mounting on a ship smokestack. The smoke density monitor provides a transmitter head and a receiver head mounted to a smokestack. The transmitter head and receiver head are optically connected with a density monitor by means of fiber-optic lines. The density monitor is electrically connected to an alarm monitor, which at pre-set smokestack smoke densities activates an alarm and/or shuts down the ship's burner(s). An optional recorder may be connected to the alarm monitor to preserve a record of smoke density. Each transmitter and recorder head has an optical head slidably attached to a head housing for ease of servicing and maintenance.

Abstract: A smoke density monitor for mounting on a ship smokestack. The smoke density monitor provides a transmitter head and a receiver head mounted to a smokestack. The transmitter head and receiver head are optically connected with a density monitor by means of fiber-optic lines. The density monitor is electrically connected to an alarm monitor, which at pre-set smokestack smoke densities activates an alarm and/or shuts down the ship's burner(s). An optional recorder may be connected to the alarm monitor to preserve a record of smoke density. Each transmitter and recorder head has an optical head slidably attached to a head housing for ease of servicing and maintenance. Each head housing incorporates an exit chamber, a trap chamber and a head chamber. The head chamber houses an optical head lens. The trap chamber provides the capability of trapping particulates to prevent their adhesion to the optical head lens.

Abstract: An oxygen monitor for a smokestack installation. The oxygen monitor includes a probe assembly mounted to the smokestack, a sensing assembly mounted to the probe assembly, and a monitor cabinet electrically connected to the sensing assembly. The probe assembly has an intake tube within an exhaust tube. Because the intake tube mouth is smaller than the effective exhaust tube mouth, the pressure reduction effect due to fluid travelling past the exhaust tube is greater than at the intake tube mouth, so fluid such as exhaust gasses tends to be drawn into the intake tube and towards an oxygen sensor. The fluid travels past the oxygen sensor and exits the probe assembly through the exhaust tube and its exhaust tube mouth, back into the smokestack. In addition, the hot oxygen sensor heats the fluid, causing it to rise into the exhaust tube and exit through its mouth. These two effects cause a self-circulation of the fluid being monitored for oxygen content, and eliminate the need for a separate fluid pump.