Mass flow meter

Venturiorificedifferential pressure

A precise reference air mass flow meter is the most important basis to optimize modern engines on the test bed. At the same time it is unfortunately one of the most challenging sensors to select and apply. Several special requirements need to be taken in account: High dynamics Big measurement spans Massive pressure- and flow pulsations Small pressure losses High precision New deltaflowB solves these requirements perfectly well! Apart from the air flow measurement, deltaflowB can even be used for exhaust or blow-by measurements. deltaflowB is working on the dp principle which offers a number of advantages. Insensitivity against fouling and dust Huge pressure and temperature range High precision deltaflowB optimizes the dp-technology in many points to fit the special needs of engine test beds. Primary element For deltaflowB, we do not use a classical primary element (orifice, venturi or nozzle), but a newly developed combination of a low-pressure-loss-venturi and a wing sensor. This combination reduces the remaining pressure loss to less than 10% of the measured differential pressure. Therefore at the highest flow rate, the pressure drop is still below 20mbar. Sensors Commercially available pressure-, differential pressure- and temperature-sensors are by far too slow for the dynamics of engine test beds. In addition to the slow transmission of measured values to the test bench, the main problem is that motor pulsations can’t be detected by standard sensors. The result is errors depending on the pulsation strength and frequency (square root error).