Rohrback Cosasco Systems

RDC-CI chemical-injection data logger
The RDC-CI chemical-injection data logger monitors the flow of corrosion inhibitor injections using quills and nozzles as contacts to calculate chemical delivery rates from 0.5 to 100 gal/d. The positive-displacement flowmeter, which operates at temperatures from –40°F to 158°F, detects chemical flow interruptions caused by low tank levels, pump failures, and high-temperature vapor locks. It can be permanently piped-in for continuous monitoring, or for occasional in-line testing, it can be piped-in on a temporary basis with an accessory kit of flexible 2-ft hoses and quick-connect couplings. Data may be transferred directly to a laptop, or gathered by the manufacturer’s Checkmate portable data collector technology for processing.

Side-Stream Assembly monitoring system
The Side-Stream Assembly monitoring system maximizes corrosion inhibitor efficiency, essentially paying for itself in about one year through savings on corrosion inhibitor costs. Installation is quick and does not require plant shutdown. The assembly includes multiple, easily connected 1-in. tees. Each tee can be specified with one of several corrosion management and process monitoring technologies, including: Microcor corrosion and erosion rate measuring, Corrater linear polarization resistance (LPR) and galvanic measuring, bio-probes, coupons, and process parameter measuring. It can be configured to meet specific process requirements.

Microcor wireless transmitter
Each Microcor wireless transmitter (MWT) monitors corrosion as a node in a self-organizing, secure network (mesh) that provides consistent data delivery. This flexible approach adapts to a plant’s layout, which improves on the traditional hard-wired model of monitoring systems. Unlike typical wireless systems, which require a direct line of sight between the instrument and the communications gateway, the Microcor allows each instrument to communicate with the next, ensuring that there can be no single point of failure and that data are successfully relayed to the gateway. In the event a temporary obstruction blocks a direct connection, the network automatically reroutes the signal to an adjacent device, ensuring network reliability and data integrity. It uses high resolutionmetal-loss measurement that provides 18-bit resolution, and is rated for operation in hazardous locations. The MWT’s allowable operating range is from –40°C to 70°C.

Intelligent Interface Unit (IIU)
The intelligent interface unit (IIU) integrates corrosion-monitoring transmitters with either a supervisory control and data acquisition (SCADA) system or distributed control system (DCS) through Modbus or object linking and embedding for process control (OLE for Process Control. or OPC). It operates inexpensively, and works with the manufacturer’s Microcor, Quicksand and Corrater corrosion-monitoring transmitters. It reads real-time corrosion rates, erosion rates, and pitting tendency in water systems. Designed for smaller-scale corrosion-management systems, the unit can also be used as a building block of a full corrosion-management system with sophisticated software for complete corrosion control. It increases efficiency by eliminating the manpower needed to manually read probes and instruments. The unit can communicate with transmitters by means of hard-wired connections, fiberoptic links, and Ethernet links, among others.

Checkmate DL
The Checkmate DL is a portable, handheld instrument that reads corrosion data from a data logger or remote data collector and then transfers the information to a computer for graphing and analysis. Compared to a portable PC, this instrument is claimed to be a better, safer option for use in hazardous areas classified as Class I, Zone 1 or Class I, Zone 2. Since the transmitter and data logger, which are both located at the data source, are already intrinsically safe and explosionproof, the entire corrosion monitoring system is safe for each step in the process. The Checkmate uses AA batteries, which provide for ten hours of continuous operation at temperatures ranging from –18°C to 50°C.