The basic system consists of an electronics unit and two breeching components. An LED light source directs a beam through the measured particulate, and a light sensor receives the beam, detects changes in opacity, and sends a proportional signal to the electronics unit. The wide-beam LED light source and narrow-view receiver make installation easy: alignment of the breeching units does not need to be precise. The electronics produces a digital readout of percent opacity and a 4-20 mA dc output signal suitable for recording, display, or indication. SPDT contacts are also provided for remote alarm or control functions. A contact closure is provided for a remote alarm (available separately: Cleveland Controls L- 05500-00). The operator can select manual or automatic alarm reset. Modbus communications for interface with a SCADA system (Supervisory Control and Data Acquisition system) or other controls is standard. A standard serial printer port is provided. The electronics unit is available in open-mount, surface- mount, and flush-mount formats. It can be installed in any dry, convenient area within 250 feet of the light source and receiver units. The standard model has a vacuum fluorescent display with three status LED indicators. Units equipped with auxiliary functions have four LED indicators.
