SIS-Tech
The Automated Overfill Protection System (AOPS; photo) is a safety-instrumented system that can prevent dangerous overfill conditions in terminals, tank farms and process vessels. The AOPS incorporates a non-programmable Logic Solver (suitable up to SIL 3) that receives signals from switches or transmitters, determines if an abnormal process condition is present, and provides outputs to close isolation valves, shutdown transfer pumps or open dispersion valves. The system operates independently of the plant’s process control system with the capability to communicate to the control system via hardwire, Modbus, Ethernet or wireless communications. — SIS-Tech, Houston, Tex.