Engine Emissions Monitoring System EEMS Response time NO concentration The Gasmet engine emissions monitoring system EEMS has been designed engine emissions monitoring which require for fast response time. A typical application for Gasmet EEMS consists of H2O, CO2, CO, N2O, NO, NO2, SO2, HCl, HF, NH3, CH4, C2H6, C3H8, and C2H4, but it can be easily configured for a new set of compounds and/or calibration ranges. Gasmet EEMS has a liquid nitrogen cooled CX4000 analyzer, a fast data transfer using RS422 protocol, and a powerful pump inside the sampling system. These factors contribute to a fast response time. In Figure 1, the response time of Gasmet EEMS is depicted. The Gasmet EEMS is used for on-line measurements. It is an ideal tool to use for measuring trace concentrations of pollutants in wet, corrosive gas streams. All parts of the Gasmet EEMS are be heated up to 180 ºC. It can be used for undiluted gases and the sample gases do not need drying beforehand. Figure 1. The Gasmet EEMS response time with a five meter heated line (T = 180 °C) and a PSP4000H sample probe. The Gasmet EEMS has been installed in a transportable cabin with 4 inch wheels underneath (Figure 2). The Gasmet EEMS consists of Gasmet CX4000 FTIR gas analyzer, Gasmet industrial PC, and Gasmet sampling system. As an option, the system can be equipped with Gasmet oxygen analyzer and/or with total hydrocarbon analyzer (FID). All parts of the system are 19” rack mounted and are installed on the pullout shelves. The Gasmet EEMS includes all power connections and temperature controllers for heated lines and heated sample probe. The operation of the system is fully automatic and controlled by the Calcmet software. Additionally, all functions of the Gasmet EEMS can also be used manually. The Gasmet industrial PC and Calcmet application software controls EEMS. The measuring data can be transferred from the industrial PC to the control room with digital outputs (ModBus) or with analog outputs 4 - 20 mA. The alarms are transferred with relay contact. The Gasmet EEMS provides different alarm functions such as Function alarm, Service alarm, and System alarm. Function and service alarms are associated with the Gasmet FTIR gas analyzer and with the Calcmet analysis software. System alarm comes from Gasmet sampling system and it includes temperature alarms (from sample probe, heated lines, and sampling unit), flow alarm, and pressure alarm for zero gas. If any of the critical alarms is activated, instrument air starts to flow automatically into the system to prevent condensation. Standard EEMS is also equipped with a one span gas valve to allow automated span checks. Figure 2. The Gasmet EEMS components and cabin

General parameters Measuring parameters Gas analyzer: Measuring principle: Performance: Operating temperature: Storage temperature: Response time, T90: Response time, T10-90: Result update time: Gas cell temperature: Sample gas: Flow rate: Sample gas pressure: Gasmet CX4000 FTIR (Fourier Transform Infrared) Simultaneous analysis of up to 50 gas components 20 ± 20 °C, non-condensing, dust free ambient air. -20 - +60 °C < 2.5 s < 1.5 s < 0.4 s 50 - 180°C Non-condensing, particle free ~ 12 liters per minute Ambient Air conditioning Cooling principle: Ventilation Heated lines_ Tube size: 4/6...