The Hays Cleveland A-08740-A0 Universal Opacity Monitor provides reliable, continuous measurement of the density of particulates such as dust or smoke. The basic system consists of an electronics unit and two breeching components (light source and receiver). Detected change in opacity result in a proportional signal to the electronics which produces 4-20 mA dc output suitable for remote alarm, recording, display, or control functions. There is also a digital readout of the percent opacity on the front face of the electronics unit. SPDT contacts are provided for a remote alarm or controller which can be manually or automatically reset. Modbus communications for interface with a SCADA system is standard. A printer serial port is also standard. The standard unit includes a vacuum fluorescent display and three status LED’s. In addition, auxiliary functions available include Burner Cutoff and Overfire Air Timer modules.