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This paper describes a recently developed sensor, the High-Performance Flowmeter (HPF), which measures flow rates in raw, undiluted exhaust. The HPF is based on the principle of acceleration or deceleration of an ultrasonic pulse due to a flow of gas. It allows a two-directional detection of flow with high accuracy and high sampling rates. Formerly, all flow sensors were limited to low temperatures and low sampling rates when measuring the flow rates directly in raw exhaust. An entirely new principle has been developed for this generation of ultrasonic pulses which improves the performance of ultrasonic flow sensors dramatically. Using this principle, such flow sensors can be used for the first time to measure dynamic flow rates in raw exhaust at high temperatures with sampling rates up to several hundred hertz.

For the increased requirements on computer automatization and data evaluation in the field of emission testing, new programming / computer - technologies are required. To fulfill the requirements of the programmer and the user of the software, Windows NT with object oriented programming was found to provide the best possibilities to control such highly automated, complex systems. Under these directions the new Emission Test Cell Computer (short ETCC) was developed with use of the latest software and hardware technology. The Test Cell Computer provides a control system with integrated storing and paperless documentation of all relevant test data as well as protocols with all today's possibilities to create printouts. Also the managing work necessary for multiple tests running in parallel at the same time in different rooms with progress monitoring is included. The ETCC can easily be integrated into network environments and connected e.g. to existing networks.