We evaluated GE's CEMS DAHS system about 5 years ago. The competing system from ESC beat them out and it sounds like we should be glad it did! Our power plants had systems from a vendor that went out of business and software support for it was extremely limited. Thus, our company sought out a new DAHS and CEMS software package and interfaced it to the existing sampling system and analyzers. We yanked out the old PLC-5's and replaced them with ESC's 8832 dataloggers. The 8832 dataloggers are rackmount specialized application specific machines and have proved reliable and dependable. A few of the people that were with the original suppliers of our CEMS systems (STI Grasby that was bought by Thermo Environmental and put away) have formed a new company, STI CEMS Services. You might try them as they work with many CEMS systems and should be able to give you some advice. They make a sampling probe assembly and they also do field service work. http://www.sticems.com/index.htm ESC, Environmental Systems Corporation, is our DAHS and CEMS software vendor. StackVision is what they call thier CEMS software package. I believe that they can also supply complete CEMS systems including the sampling system and analyzers. http://envirosys.com/ BTW, we are using Thermo Environmental's CO2 & NOx analyzers. They work pretty well. CEMS systems are pretty simple but they are finicky. One piece of dirt clogs your critical sampling orifice, or a leaky o-ring or sample pump diaphragm screws up your dilution. The probe and sample transport system to your analyzers has to be working good. Analyzers have thier problems in that some of thier internal components periodically go bad or degrade. Maintenance intensive systems. I have five of them to keep up with. Hope I helped! Greg
